DP20 Manual

1. Economical multisignal meter DP20

1/8 DIN Economical Multisignal panel meter for Process, Temperature and Electrical measurements

Economical multisignal digital panel meter in 1/8 DIN size for panel mount, and a wide range of applications. Accepts AC and DC voltage signals from mV up to 600 V and currents up to 5 A (AC measures in True RMS), process signals (mA and Vdc) with excitation voltage included, thermocouples K, J, E, N, L, R, S, B, T and C, resistive temperature probes (Pt100, Pt500, Pt1000, Ni100, Ni200, Ni1000, PTC and NTC), resistances, potentiometers and frequency. Scalable reading with 4 digits up to 9999 / -1999 with configurable decimal point. Two independent alarms, configurable as maximum or minimum, with hysteresis and setpoint.

Optional 1 or 2 relay outputs, 4/20 mA isolated analog output, and Modbus RTU isolated serial communications.

Front protection IP65. Connections with plug-in screw terminals.

Instrument designed for industrial use, highly flexible, allows for integration in multiple applications, reduced cost, excellent quality and optional customization available.

• 'Fast access' menu at front key UP (5) configurable for fast access to alarm setpoints (see section 1.20).
• 'Eco' mode reduces power consumption (see section 1.23).
• Simplified scaling configuration (see section 1.21).
• Function 'external control' to activate with a contact a predefined function (second scaling, decimal point, reading "hold", "tare," memory of maximum or minimum) (see section 1.24).
• 5 configurable brightness levels (see section 1.29.7).

1.1 How to order

1.2 Front View

1.3 Rear view

1.4 Power connections

Earth connection - The instrument does not need earth connection for correct operation nor for compliance with security regulations. Terminal 9 is not connected to any internal circuit and is provided only as a safe place for earth wire.

Fuse - As requested by security regulation 61010-1, add a protection fuse to the power to act as disconnection element, easily accessible to the operator and identified as a protection device.

250 mA time-lag for power voltage > 50 Vac/dc
400 mA time-lag for power voltage < 50 Vac/dc

1.5 Signal connections

Signals up to 600 V and 200 V (AC and DC) must be connected at terminals 1 and 4. Signals for 5 A current (AC and DC) must be connected at terminals 3 and 4. All other signals must be connected between terminals 2 and 4. Terminal 5 is a 'multifunction' terminal, configurable with one of the following functions:

• +15 Vdc excitation voltage (Vexc) for process signals
• +5 Vdc excitation for potentiometer signals
• connection for the Pt100 third wire compensation
• external contact 'EK' function

To select the terminal 5 function, select the position of internal jumper 'T' (see section 1.9).

1.6 Mechanical dimensions in mm (in)

1.7 Installation and start-up

1. Open the instrument as indicated at section 1.26 and access the internal board.
2. Select jumpers 'S' for the signal range required (see section 1.9).
3. Select jumper 'T' to assign to multifunction terminal 5 the required functionality (see section 1.9).
4. Close the instrument as indicated at section 1.26.
5. Connect the input signal and the power supply as indicated at sections 1.4 and 1.5.
6. Enter the 'configuration menu' to configure the instrument (scaling, alarms, ...) (see section 1.29).

1.8 Technical specifications

1.9 Internal jumpers

Internal jumpers 'S' are associated to the signal range. The position of internal jumper 'T' assigns the function of the multifunction terminal 5. At 'T'ble 2' see a list of signal ranges and associated jumper 'S' and 'T'. At Table 3 see the position for jumper 'T' associated to each function of the multifunction terminal 5. To access the internal jumpers, open the housing as explained at section 1.26. For additional information on each signal range see the following sections:

• Ranges for AC voltages and currents, see section 1.10
• Ranges for DC voltages and currents, see section 1.11
• Ranges for thermocouples, see section 1.12
• Ranges for Pt and Ni probes, see section 1.13
• Ranges for NTC probes, see section 1.14
• Ranges for PTC probes, see section 1.15
• Ranges for process signals, see section 1.16
• Ranges for frequency signals, see section 1.17
• Ranges for resistance measures, see section 1.188
• Ranges for potentiometer measures, see section 1.199

1.10 Measuring AC voltages and AC currents

• AC signal ranges
  The instrument accepts the measure of AC voltages and currents, with ranges from 60 mVac up to 600 Vac, covering from shunt signals to typical power line voltages of 48 Vac, 115 Vac, 230 Vac and even 380 Vac. Both phase - to - neutral and phase - to - phase measures are accepted. AC currents signals of up to 5 Aac are accepted, and it has a range of 20 mAac.
• 'True RMS' measure
  AC measure are TrueRMS. The instrument assigns a 'dead band' around 0, with a configurable value between 0 and 100. Value is empirical, and by default is set to 20. The 'dead band' can be configured at the 'Configuration menu' (see section 1.29.7).
• Scaling
  The instrument allows to scale the reading to 4 digits (9999 / -1999) with configurable decimal point to any position. The 'second scaling' function can also be used (see section 1.25).
• Maximum oversignal
  'Maximum oversignal' is the maximum signal accepted by the instrument. Higher signal values may cause instrument damage. Lower values are non destructive but may be out of accuracy specifications.
• Response times
  The response time to a signal step is 300 mSeconds, independent of the signal range selected.
• Terminal 5 'multifunction' - External control Terminal 5 remains configured as 'EK' external control function. See section 1.9 for a list of available functions.
• Start-up, connections and jumpers For instrument start-up follow the steps listed at section 1.7. Signal connections are indicated at section 1.5. Location for internal jumpers is indicated at section 1.9.

See below a list of typical connections:

1.11 Measuring DC voltages and DC currents

• Measuring DC signal ranges
  The instrument accepts the measure of DC voltages and currents, with ranges from 60 mVdc up to 600 Vdc, covering applications with current shunts, tachometric dynamos, batteries, process, etc. DC currents signals of up to 5 Adc are accepted, and it has a range of 20 mAdc.
• Bipolar ranges
  All signal ranges are bipolar, and the instrument can measure both the positive and the negative signal.
• Scaling
  The instrument allows to scale the reading to 4 digits (9999 / -1999) with configurable decimal point to any position. The 'second scaling' function can also be used (see section 1.25).
• Maximum oversignal
  'Maximum oversignal' is the maximum signal accepted by the instrument. Higher signal values may cause instrument damage. Lower values are non destructive but may be out of accuracy specifications.
• Response times
  The response time to a signal step is 300 mSeconds, independent of the signal range selected.
• Terminal 5 'multifunction' - External control
  Terminal 5 remains configured as 'EK' external control function. See section 1.9 for a list of available functions.
• Start-up, connections and jumpers
  For instrument start-up follow the steps listed at section 1.7. Signal connections are indicated at section 1.5. Location for internal jumpers is indicated at section 1.9.

See below a list of typical connections:

1.12 Measuring thermocouples

• Thermocouples accepted
  The instrument accepts direct connection of thermocouples type K, J, E, N, L, R, S, B, T and C.
• Temperature ranges and total error
  Temperature ranges and total error for each type of thermocouple are indicated on 'Table 10' below.
• Cold junction compensation
  The thermocouple cold junction is automatically compensated by the instrument. The automatic compensation can be disabled from the configuration menu.
• Resolution and units
  The instrument resolution when measuring thermocouples is 1º. Reading can be configured in ºC (degrees Celsius) or ºF (degrees Fahrenheit).
• Sensor break detection
  In case of sensor break, the instrument will show 'h.ovr' or 'h.udr' (see Table 17) depending on the broken cable.
• Compensated cable
  To correctly measure a thermocouple signal, always use compensated cable, of the thermocouple used, to connect the instrument and the thermocouple.
• Response times
  The response time to a signal step is 300 mSeconds, independent of the signal range selected.
• Terminal 5 'multifunction' - External control
  Terminal 5 remains configured as 'EK' external control function. See section 1.9 for a list of available functions.
• Start-up, connections and jumpers
  For instrument start-up follow the steps listed at section 1.7. Signal connections are indicated at section 1.5. Location for internal jumpers is indicated at section 1.9.

See below connections for thermocouple:

1.13 Measuring with Pt and Ni probes

• Accepted Pt and Ni probes
  The instrument accepts connection of Pt100, Pt500 and Pt1000 temperature probes, and also Ni100, Ni200 and Ni1000 temperature probes. Temperature ranges for each type of probe are indicated on 'Table 11' below.
• Pt100 with 2 and 3 wires
  The instrument accepts connection for 2 and 3 wire Pt100 probes. For 3 wire Pt100 probes, configure internal jumper 'T' at position 5-6 (see section 1.9). For 2 wire Pt100 probes, configure internal jumper 'T' at position 4-5. Compensation of the wire resistance for 2 wire probes can be manually configured with the parameter 'Offset reading' ('oFFS') (see section 1.22) which allows to configure a fixed number of counts to be added to the reading.
• Resolution and units
  The temperature resolution using Pt and Ni temperature probes is configurable to 1º or 0.1º. Reading can be configured in ºC (degrees Celsius) or ºF (degrees Fahrenheit).
• Sensor break detection
  In case of sensor break, the instrument will show h.ovr or 'h.udr' (see Table 17) depending on the broken cable.
• Alpha temperature coefficient
  The instrument accepts Pt probes (Pt100, Pt500, Pt1000) with 'Alpha' parameter of '0.0385' and '0.0390' (see section 1.29.7). This parameter is associated to the specific model of probe installed.
• Terminal 5 'multifunction' - 'Pt100 3 wire' or 'External control'
  To configure for 3 wire Pt100 probes, set internal jumper 'T' at position 5-6 (see section 1.9). Terminal 5 will be assigned to the connection of the third wire of the Pt100 probe, for automatic wire resistance compensation purposes, up to 30 R. To configure for 2 wire Pt100 probes, set internal jumper 'T' at position 4-5 (see section 1.9). Terminal 5 will be configured as 'EK' external control function. See section 1.9 for a list of available functions.
• Start-up, connections and jumpers
  For instrument start-up follow the steps listed at section 1.7. Signal connections are indicated at section 1.5. Location for internal jumpers is indicated at section 1.9.

See below a list of typical connections:

1.14 Measuring with NTC probes

• Accepted NTC probes
  The NTC probe is a temperature variable resistor with a temperature - resistance curve defined by two parameters called 'R25' and 'beta'. By default, the instrument is configured for a standard NTC with 'R25' of 10K and 'beta' of 3500. The measured temperature ranges from -60ºC to 150ºC. Different NTC probes can be used, by configuring the instrument for different values of 'R25' and 'beta'. The instrument measures resistance from 100 R up to 1 MOhm. Use 'Table 12' to write down values for your NTC.
• Parameters 'R₂₅' and 'Beta'
  The instrument accepts values of 'beta' between 2500 and 5500, and values of R25 between 1.0 K and 200.0 K
• Resolution and units
  The temperature resolution using NTC temperature probes is configurable to 1º or 0.1º. Reading can be configured in ºC (degrees Celsius) or ºF (degrees Fahrenheit).
• Sensor break detection
  In case of sensor break, the instrument will show 'h.ovr' or 'h.udr' (see Table 17) depending on the broken cable.
• Terminal 5 'multifunction' - External control
  Terminal 5 remains configured as 'EK' external control function. See section 1.9 for a list of available functions.
• Start-up, connections and jumpers
  For instrument start-up follow the steps listed at section 1.7. Signal connections are indicated at section 1.5. Location for internal jumpers is indicated at section 1.9.

See below connections for NTC probe:

1.15 Measuring with PTC probes

• Accepted PTC probes
  The instrument accepts direct connection of PTC probes. Accepted PTC probes are listed at 'Table 14'.
• Resolution and units
  The temperature resolution using PTC temperature probes is configurable to 1º or 0.1º. Reading can be configured in ºC (degrees Celsius) or ºF (degrees Fahrenheit).
• Sensor break detection
  In case of sensor break, the instrument will show 'h.ovr' or 'h.udr' (see Table 17) depending on the broken cable.
• Terminal 5 'multifunction' - External control
  Terminal 5 remains configured as 'EK' external control function. See section 1.9 for a list of available functions.
• Start-up, connections and jumpers
  For instrument start-up follow the steps listed at section 1.7. Signal connections are indicated at section 1.5. Location for internal jumpers is indicated at section 1.9.

See below connections for PTC probe:

1.16 Process measures

• Measuring process signals
  The instrument accepts the measure of process signals in 4/20 mA and 0/10 Vdc. The instrument provides excitation voltage to power up transducers.
• Scaling
  The instrument allows to scale the reading to 4 digits (9999 / -1999) with configurable decimal point to any position. The 'second scaling' function can also be used (see section 1.25).
• Maximum oversignal
  'Maximum oversignal' is the maximum signal accepted by the in- strument. Higher signal values may cause instrument damage. Low- er values are non destructive but may be out of accuracy specifica- tions.
• Response times
  The response time to a signal step is 300 mSeconds, independent of the signal range selected.
• Terminal 5 'multifunction' - 'Vexc' or 'External control'
  To configure the +15 Vdc excitation voltage at terminal 5, set internal jumper 'T' at position 1-2 (see section 1.9). Transducers with a consumption of up to 30 mA can be powered from this terminal.
  
  To configure the 'EK' external contact function at terminal 5, set internal jumper 'T' at position 4-5 (see section 1.9). See section 1.9 for a list of available functions.
• Start-up, connections and jumpers
  For instrument start-up follow the steps listed at section 1.7. Signal connections are indicated at section 1.5. Location for internal jumpers is indicated at section 1.9.
  
  See below a list of typical connections :

1.17 Measuring frequency

• How the instrument measures frequency
  The instrument measures frequency from an AC voltage (Vac) or AC current (Aac) signal. The instrument detects each '0' crossing of the signal, either '0 Vac' or '0 Aac'. All available Vac and Aac signal ranges are accepted as frequency input signal.
• How to configure the instrument to measure frequency
  To measure frequency from a Vac signal, select the internal jumpers for the desired AC voltage range (see section 1.9), connect the signal for the selected voltage range (see section 1.10), and configure the instrument to measure frequency (see section 1.29.1). The same applies to measure frequency from Aac signals. See example at section below.
• Scaling
  The default resolution is 0.1 Hz. The instrument allows to scale the reading to 4 digits (9999 / -1999) with configurable decimal point to any position. The 'second scaling' function can also be used (see section 1.25).
• Maximum and minimum signal
  Frequency signals below 15 Hz are measured as '0'. Frequency signals higher than 100 Hz are out of accuracy. Signals higher than 1000 Hz will read 'display overflow' 'd.oVr' error.
• Example
  To measure the 50 Hz frequency from a 230 Vac power line, select jumpers 'GI' for 600 Vac signal range (see section 1.9), connect signal to terminals '1' and '4' (see section 1.10), and configure 'frequency' at the input signal configuration menu (see section 1.29.1).

1.18 Measures of resistance

• Measuring resistive signals
  The instrument accepts the measure of resistances and provides two ranges of measure from 0 to 5 K and from 0 to 50 K.
• Compensating the resistance of the signal wire
  Resistances are measured with 2 wires system. To compensate for the possible error introduced by the resistance of the signal wires, the instrument allows to configure a fixed number of counts to be added to the reading, both in positive or negative. This is done with the parameter 'Offset reading' ('oFFS') (see section 1.22).
• Scaling
  The instrument allows to scale the reading to 4 digits (9999 / -1999) with configurable decimal point to any position. The 'second scaling' function can also be used (see section 1.25).
• Response times
  The response time to a signal step is 300 mSeconds, independent of the signal range selected.
• Terminal 5 'multifunction' - External control
  Terminal 5 remains configured as 'EK' external control function. See section 1.9 for a list of available functions.
• Start-up, connections and jumpers
  For instrument start-up follow the steps listed at section 1.7. Signal connections are indicated at section 1.5. Location for internal jumpers is indicated at section 1.9.
  See below connections for resistance measures :

1.19 Measures of potentiometers

• Measuring potentiometers
  The instrument accepts the measure of 3 wire potentiometers, with a single default range of 0/100 % of the potentiometer span.
• Scaling
  The instrument allows to scale the reading to 4 digits (9999 / -1999) with configurable .
• Response times
  The response time to a signal step is 300 mSeconds, independent of the signal range selected.
• Terminal 5 'multifunction' - 'Vexc'
  To measure potentiometer signals, set internal jumper 'T' at position 2-3 (see section 1.9). Terminal 5 will be assigned to a +5 Vdc excitation voltage for the potentiometer.
• Start-up, connections and jumpers
  For instrument start-up follow the steps listed at section 1.7. Signal connections are indicated at section 1.5. Location for internal jumpers is indicated at section 1.9.
  See below connections for measure of potentiometers :

1.20 'Fast access' menu

The 'fast access' menu allows to configure the front key 'UP' ('5') as a direct access to the alarm 1 and / or alarm 2 setpoint values, and / or the memory of maximum and minimum reading. The objective is to provide the operator with a fast and direct access to alarm setpoints, without accessing the standard configuration menu.

Access to 'fast access' menu is still allowed even with active 'password' function, allowing the operator to modify the alarm setpoints, while still blocking any other change on the configuration.

The 'fast access' menu is configurable, and it allows to assign to the front key none, one, several or all of the available functions. In case of configuring access only to alarm 1, when pushing front key 'UP' ('5'), the display directly access the setpoint value of alarm 1 (same for alarm 2)

To configure the 'fast access' menu see section 1.29.4.

1.21 Scaling

The instrument can scale the reading to any value between 9999 and -1999 and configure the decimal point position, for all signal ranges except temperature ranges (thermocouples, Ni and Pt sensors, NTC and PTC sensors) are not scalable. The scaling configuration is a simplified two steps process:

1. configure at the 'Display Low' ('d.Lo') parameter the reading value associated to the low signal range
2. configure at the 'Display High' ('d.Hi') parameter the reading value for the high signal range

Some examples are explained below:

• for AC voltage and current ranges, for example 0/400 Vac, configure at 'd.Lo' the reading for a signal of 0 Vac. Configure at 'd.Hi' the reading for a signal of 400 Vac.
• for DC voltage and current ranges, for example ±400 Vdc, configure at 'd.Lo' the reading for a signal of 0 Vdc. Configure at 'd.Hi' the reading for a signal of 400 Vdc.
• for process ranges, for example 4/20 mA, configure at 'd.Lo' the reading for a signal of 4 mA. Configure at 'd.Hi' the reading for a signal of 20 mA.
• for potentiometer ranges, configure at 'd.Lo' the reading for a signal of 0% (0 R). Configure at 'd.Hi' the reading for a signal of 100% (nominal of the potentiometer).

To configure the scaling see section 1.29.2.

1.22 Offset reading

The 'Offset reading' ('oFFS') parameter allows a number of counts to be added to the reading. This is specially useful to manually compensate for resistance errors due to wire resistance, when measuring with 2 wires Ni and Pt probes, and resistances. Applies to all signal ranges. See configuration menu at 'Tools' \ 'oFFS' (see section 1.29.7).

1.23 'Eco' mode

The 'Eco' mode reduces the consumption of the instrument to a level of 0.3 W. The 'Eco' mode turns off the display, while the right decimal point remains flashing gently on and off, showing that the instrument is running on the background.

Display will turn on when an alarm activates, or when the operator touches any of the front keys. If no alarms are active, and there is no interaction from the operator, the instrument will turn off the display. The waiting time before display turn off is configurable from 5 to 255 seconds.

To configure the 'Eco' mode see the configuration menu at 'Tools' \ 'Eco' (see section 1.29.7).

1.24 External control

The 'external control' function allows to activate, by closing a free potential contact, one of the following configurable functions:

• activation of the second scaling
• change the active decimal point
• 'hold' the reading
• 'tare' function
• visualize de memory of maximum (or minimum)

To configure the 'EK' external contact function, set internal jumper 'T' at position 4-5 (see section 1.9). The 'EK' external control function is not compatible with function 'Vexc' (excitation voltage), the measure of 3 wire Pt100, and the measure of potentiometers.

To assign a function to the 'external control' see the configuration menu at 'External control' (see section 1.29.6).

The function associated to the 'EK' external control activates when short-circuiting terminal 5 and terminal 4.

1.25 Second scaling

The instrument provides a 'second scaling', independent and additional to the standard scaling explained at section 1.21. Control of the scaling to be applied, with a free potential contact called 'External control'. To configure the 'second scaling' :

1. configure the internal jumper 'T' to activate the 'EK' external control function (see section 1.9).
2. associate the external control to the 'second scaling' function, at the configuration menu 'ScL.2' set the value 'EXt.c' ('External control') (see section 1.29.6)
3. configure the scaling at the configuration menu 'Tools' \ 'ScL.2' (see section 1.29.7).
4. apply connections to the external control

1.26 To open the instrument

To open the housing and access the internal circuits, use a flat screwdriver to unlock clips 'D', 'C', 'B' and 'A', in this order. Remove the front filter. Let the inside of the instrument slide out of the housing.

To reinsert the instrument make sure that all modules are correctly connected to the pins on the display module. Place all the set into the housing, assuring that the modules correctly fit into the internal guiding slides of the housing. Once introduced, place again the front filter at cover 'X', and then insert clips 'A', 'B', 'C' and 'D', in this order.

See section 3 for a detailed description on how to open and close the housing.

1.27 How to operate the menus

The instrument has two menus accessible to the user:

'Configuration menu' (key SQ) (■)

'Fast access' menu (key UP) (▲)

Configuration menu

The 'configuration menu' modifies the configuration parameters to adapt the instrument to the application needs. To access the 'configuration menu' press for 1 second the SQ (<) key. This access can be blocked by activating the 'Password' ('PASS') function. While operating the 'configuration menu', the alarm status is 'hold' to the status they had before accessing the menu, and the output and control modules remain in 'error' state. When leaving the 'configuration menu', the instrument applies a system reset, followed by a brief disconnection of the alarms and the output and control modules. Functionality is then recovered.

For a detailed explanation on the 'configuration menu' see section 1.30, and for a full view of the 'configuration menu' structure see section 1.30.

'Fast access' menu

The 'fast access' menu is an operator configurable menu, providing fast and direct access to the most usual functions of the instrument with a single key pad stroke. Press key UP (5) to access this menu.

See section 1.20 for a list of functions eligible for 'fast access' in this instrument. The 'Password' ('PASS') function does not block access to this menu. Accessing and modifying parameters in the 'fast access' menu does not interfere with the normal functionality of the instrument, and it does not generate any system reset when validating the changes.

Front key pad description

Key SQ (<) - press the SQ (<) key for 1 second to access the 'configuration menu'. Inside the menu, the SQ (<) key functions as a 'ENTER' key. It selects and accesses the menu option currently displayed. At menus with numerical value entries, it validates the number displayed.

Key UP (5) - the UP (5) key gives access to the 'fast access' menu. Inside the menus, it moves vertically through the different menu options. At menus with numerical value entries, it modifies the digit selected by increasing its value to 0, 1, 2, 3, 4, 5, 6, 7, 8, 9.

Key LE (3) - inside the menus, the LE (3) key functions as the 'ESCAPE' key. It leaves the selected menu, and eventually, will leave the whole menu. When leaving the 'configuration menu' with the LE (3) key, the changed parameters are activated. At menus with numerical value entries, the LE (3) key allows to select the active digit. To modify the value of the selected digit use the UP (5) key.

Menu 'rollback'

After 30 seconds without interaction from the operator, the instrument will rollback and leave the 'configuration menu' or the 'fast access' menu. All changes will be discarded.

Example of operation inside the 'configuration menu'.

1. The SQ (<) key enters into the 'configuration menu'.
2. The SQ (<) key enters into the 'InP' option menu.
3. The UP (5) key moves through the menu options.
4. The SQ (<) key selects the desired range and returns to the 'InP' menu.
5. The LE (3) key leaves the actual menu level and moves to the previous menu level.
6. The LE (3) key leaves the 'configuration menu'. Changes are applied and saved at this moment.

1.28 Messages and errors

The error messages are shown on display in flash mode.

1.29 Configuration menu

1.29.1 Input signal ranges

Access the 'Input' ('InP') menu to select the input signal range. For a correct reading, the internal jumper 'T' (see section 1.9) must also be selected accordingly.

The instrument offers the following signal ranges :

• 'AC signals' ('Ac') - select a range between 600 Vac, 200 Vac, 20 Vac, 2 Vac, 200 mVac, 60 mVac, 5 Aac and 20 mAac. The AC measure ranges provide 'True RMS' reading.
• 'DC signals' ('dc') - select a range between ±600 Vdc, ±200 Vdc, ±20 Vdc, ±2 Vdc, ±200 mVdc, ±60 mVdc, ±5 Adc and ±20 mAdc. Dc measures are bipolar.
• 'Process' ('Proc') - select 4/20 mA or 0/10 Vdc. The instrument provides excitation voltage to power up transducers at terminal 5. To configure the excitation voltage, see section 1.16.
• 'Thermocouples' ('tc') - select the thermocouple type between K, J, E, N, L, R, S, B, T and C. The instrument automatically compensates for the thermocouple cold junction.
• 'RTD probes' ('rtd') - the 'rtd' menu offers temperature resistive probes type Pt (platinum) and Ni (Nickel). Select the type of probe from the available options Pt100 3 wire, Pt100 2 wire, Pt500, Pt1000, Ni100, Ni200 and Ni1000. For measures with 2 wires, a manual compensation for the wire resistance error is available using parameter 'Offset reading' ('oFFS') (see section 1.22).
• 'NTC probes' ('ntc') - select the 'ntc' menu to configure the input for NTC probes. To correctly configure the measure for NTC, two parameters need to be defined : first the resistance of the NTC probe at 25º ('r.25') and parameter 'beta' ('bEtA). The instrument accepts beta values between 2000 and 5500. For more information on NTC measures see section 1.14.
• 'PTC probes' ('Ptc') - select the 'ptc' menu to configure the input for PTC probes. Select K121 for PTC probes from the KTY-121 family (KTY81-121 and KTY82-121). Select K220 for PTC probes from the KTY-210 family (KTY81-210 and KTY82-210) and KTY-220 (KTY81-220 and KTY82-220). For more information on PTC probes see section 1.15.

• 'Resistance' ('rES') - select 5 K for a measuring range from 0 to 5 KOhms or select 50 K for a measuring range of 0 to 50 KOhms. For a manual compensation for the error introduced by the signal wires, see parameter 'Offset reading' ('oFFS') (see section 1.22).
• 'Potentiometer' ('Pot') - potentiometer measure has a single range, valid for any potentiometer with nominal value between 500 R and 20 K.
• 'Frequency' ('FrEq') - frequency measure has no selectable ranges. The instrument reads frequency up to 100 Hz, within accuracy specifications. For more information on frequency measuring see section 1.17.

• at the 'Alarm type' ('TypE') parameter select alarm as as a maximum type alarm ('MAX') or a minimum type alarm ('MIn'). The maximum type alarm (or minimum type) activates when the display value is higher (or lower) than the setpoint value.
• at the 'Setpoint' ('SEt') parameter enter the value for the alarm activation point. This parameter is eligible for configuration through the 'Fast access' menu (see section 1.20).
• configure the hysteresis value at 'Hysteresis' ('hySt'). The hysteresis applies to the deactivation process of the alarm. The alarm deactivates when the reading has passed the setpoint value plus the hysteresis value. Hysteresis helps to avoid repetitive switching of the alarm relays, due to fluctuating input signals around the setpoint.

1.29.4 Fast access

The key 'UP' (5) at the front of the instrument gives access to a list of functions configurable by the operator. See section 1.27 for an explanation on how to operate the 'fast access' menu.

The 'Key UP (Fast access)' ('K.uP') menu allows user to select which functions will be accessible when pressing the front key 'UP' (5). Select 'on' to activate each function.

• the 'Setpoint 1' ('ALr1') function allows user to visualize and modify the setpoint value of alarm 1.
• the 'Setpoint 2' ('ALr2') function allows user to visualize and modify the setpoint value of alarm 2.
• the 'Memory of maximum' ('MAX') or 'Memory of minimum' ('MIn') allows user to visualize the memory of maximum and minimum reading. The memory resets when the instrument restarts (power off-on cycle, or when leaving the configuration menu with a change to be applied).
• the 'Tare function' ('tArE') allows user to visualize the actual tare value.

1.29.5 Super fast access

If only a single function is selected for the 'fast access' menu, pressing the the 'UP' (5) key will shortly display the function name and then automatically jump to the function value.

1.29.6 External control

An external on / off control can be connected to the rear of the instrument. The operator can then control the activation of a configured function based on the state of this control. Function remains activated while the external contact is closed, and will deactivate when contact is open. To configure the function associated to the external control, enter the menu 'External control' ('EXt.c').

• select 'Disabled' ('oFF') to have no function associated.
• select parameter 'Memory of maximum' ('MAX') to visualize on display the memory of maximum reading.
• select parameter 'Memory of minimum' ('MIn') to visualize on display the memory of minimum reading.
• select parameter 'Display hold' ('hoLd') to maintain the actual reading 'on hold'. Open the external contact to free the reading
• select 'Tare function' ('tArE') to activate a tare to the signal. The actual signal will read '0'. The calibration is not changed.

Parameters 'Memory of maximum' ('MAX'), 'Memory of minimum' ('Min') and 'Display hold' ('hoLd') show on display a value which is not the actual measured input signal, therefore the values for this parameters will be shown in flash mode, indicating that the actual value is not the actual input value.

• select parameter 'Decimal point 0' ('dP.0') to remove the decimal point on display.
• select parameter 'Decimal point 1' ('dP.1') to activate the decimal point at position XXX.X
• select parameter 'Decimal point 2' ('dP.2') to activate the decimal point at position XX.XX
• select parameter 'Decimal point 3' ('dP.3') to activate the decimal point at position X.XXX

Parameters 'Decimal point 0' ('dP.0')and similar 'dP.1'and>, 'dP.2' and 'dP.3' control which decimal point is on. When the external contact closes, the decimal point selected lights on and the decimal point that was activated before will power off. When the external contact opens, the previous decimal point powers on again while removing the new decimal point. Display does not show in flash mode when decimal point functions are activated.

• select parameter 'Second scaling' ('ScL.2') to activate the second scaling configured at menu 'Tools' ('TooL') \ 'Second scaling'. The activation of the 'Second scaling' function is accepted for all signal input ranges based on AC input signals, DC input signals, process and resistances. Display does not show in flash mode when second scaling function is activated. For more information on the 'Second scaling' seer section 1.25

1.29.7 Menu 'Tools'

The 'Tools' ('tooL') menu contains multiple configuration options of the instrument.

• select at the 'Option 1' ('out.1') parameter the module type installed at the 'Opt.1' (see section 2) slot. Select 'relay' ('rELE') for the relay output module 'A1'. Select 'analog output' ('420') for the analog output module 'M1'. Select 'Modbus RTU' ('r.485') for the Modbus RTU serial output module 'S1'.

Note : the parameter '420' gives access to the calibration menu for the analog output module. See section 2.2 for more information about this menu and the calibration.

• the 'Steps' ('StEP') parameter allows to configure a defined minimum step change on the reading. Reading will change in steps of 1, 2, 5, 10, 20 or 50 counts.
• the 'Average filter' ('AVr') function allows to reduce reading oscillations due to noisy signals, by applying a recursive filter on the reading values. The strength of the recursive filter is a value configurable between '0' and '100'. Value '0' means 'filter disabled'. Filter strength increases with the value. Increasing the filter strength, increases the response time of the instrument.
• the 'Offset reading' ('oFFS') parameter allows to configure a fixed number of counts to be added to the reading. Accepts values from -500 to 500. This function allows to compensate for the possible error introduced by the resistance of the signal wires when measuring Pt probes, Ni probes or resistances. For more information see section 1.22

1.30 Full configuration menu

1.31 Precautions on installation

This instrument has been designed and verified conforming to the 61010-1 CE Security Regulation, for industrial applications. Installation of this instrument must be performed by qualified personnel only. This manual contains the appropriate information for the installation. Using the instrument in ways not specified by the manufacturer may lead to a reduction of the specified protection level. Disconnect the instrument from power before starting any maintenance and / or installation action.

The instrument does not have a general switch and will start operation as soon as power is connected. The instrument does not have protection fuse, the fuse must be added during installation.

The instrument is designed to be panel mounted. An appropriate ventilation of the instrument must be assured. Do not expose the instrument to excess of humidity. Maintain clean by using a humid rag and do NOT use abrasive products such as alcohols, solvents, etc. General recommendations for electrical installations apply, and for proper functionality we recommend : if possible, install the instrument far from electrical noise or magnetic field generators such as power relays, electrical motors, speed variators, ... If possible, do not install along the same conduits power cables (power, motor controllers, electrovalves, ...) together with signal and/or control cables. Before proceeding to the power connection, verify that the voltage level available matches the power levels indicated in the label on the instrument. In case of fire, disconnect the instrument from the power line, fire alarm according to local rules, disconnect the air conditioning, attack fire with carbonic snow, never with water.

1.32 Factory configuration

2. Output and control modules

2.1 Modules A1 and A2 (relay output)

The A1 (and A2) modules offer 1 relay output to be installed at slot Opt.1 (module A2 at Opt.2). The relay installed at Opt.1 is controlled by alarm 1, and is configured from the ‘Alarm 1’ (‘Alr1’) menu explained at section 1.29.3. The relay installed at Opt.2 is controlled by alarm 2, and is configured from the ‘Alarm 2’ (‘Alr2’) explained at section 1.29.3. Relay with 3 contacts (Common, Normally closed, Normally open) accepting voltages up to 250V @8A.

The A1 and A2 modules can be ordered installed in to a Series C instrument or standalone for later installation, as they do not require soldering or special configuration..

2.2 Module M1 (analog output)

The M1 module offers 1 analog output at 4/20 mA, isolated, to be installed at slot Opt1.

The 4/20 mA output signal is fully scalable, both with positive and negative slopes, and is proportional to the reading of the instrument. The mA output can be connected to work in active loop (the module provides the power of the loop) or passive mode (the power of the loop is not provided by the instrument)

Connections

For an active 4/20 mA loop, connect terminal A (‘Vexc +15 Vdc’) as current output and terminal B (‘Signal in mA’) as return of current. For a passive 4/20 mA loop, connect terminal B (‘signal in mA’) as current output and terminal C (‘GND’) as return of current.

Installing, calibrating and configuring a M1 module

If the M1 module has been acquired installed in the instrument, then the module has been factory calibrated. In this case you can jump directly to point 7 below.

If the M1 module has been acquired separately and installation is needed, follow the next steps :

1. Access the instrument and install the M1 module at slot Opt.1 (see section 1.26).
2. From the ‘Configuration menu’ go to ‘tool’ \ ‘out.1’ and select value ‘420’ (see section 1.29.7) to inform the instrument that there is a M1 analog output module installed.

From this point you will need the calibration sheet provided together with the module M1. This sheet shows the values for parameters ‘cAL.y / 4mA’ and ‘cAL.y / 20mA’.

3. When selecting ‘420’ the instrument shows ‘cAL.n’. (‘Do not calibrate’). Press ‘UP’ (5) to read ‘cAL.y’ (‘Calibrate’).
4. When selecting ‘cAL.y’ (‘Calibrate’) select ‘4 mA’. Display shows a number. Introduce the value of the ‘cAL.y / 4mA’ indicated at the calibration sheet provided together with the M1 module. Increase the numerical value with key ‘UP’ (5) and reduce the value with key ‘LE’ (3). Validate the value with key ‘SQ’ (<). See below an image of the configuration menu.
5. Repeat with the ‘20 mA’ parameter, and update with the value ‘cAL.y / 20mA’ indicated at the calibration sheet. Validate with key ‘SQ’ (<), and press key ‘LE’ (3) several times to exit the ‘Configuration menu’.
6. The instrument will reboot when exiting the menu. The analog output is calibrated.
Note : if you do not have the calibration sheet which was shipped together with the M1 module, you can use a miliammeter to measure the mA at the output loop. Then access parameters ‘cAL.y / 4mA’ and ‘cAL.y / 20mA’ and adjust the calibration value by checking the miliammeter value.

At this point the module is installed and calibrated. Now configure the reading associated to the output signal 4 mA and 20 mA.

7. Configure the reading associated to the 4 mA output signal and the reading associated to the 20 mA output signal, at the configuration menu ‘out.1’ \ ‘420’ (see section 1.29.8).

2.3 Module S1 (Modbus RTU)

The S1 module offers 1 Modbus RTU serial output, isolated, to be installed at slot Opt1.

Configuration is done from the front keypad, through the configuration menu. The instrument must be informed that there is a Modbus RTU module at slot.1 and this is done at the configuration menu ‘Tool’ \ ‘out.1’ (see section 1.29.7). Then configure the bus parameters at the configuration menu ‘out.1’ \ ‘r485’ (see section 1.29.8).

The S1 module can be ordered installed in to a Series C instrument or standalone for later installation, as it does not require soldering or special configuration.

3. How to open and close

The information contained in this document is believed to be correct, but OMEGA accepts no liability for any errors it contains, and reserves the right to alter specifications without notice.