1-4 Channel Flatbed Recorders, Accepts dc Voltage, Thermocouple, and RTD Inputs

RD3720 Series

Flatbed Temperature Chart Recorders

RD3720 Series:1-4 Channel Flatbed Recorders, Accepts dc Voltage, Thermocouple, and RTD Inputs

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•	Accepts dc Voltage, 12 Types of Thermocouples and RTD Inputs
•	Choice of Measured Data, Bar Graph or Range Data Display Modes
•	Model RD3721 Has Printer and Electronic Pen Lift
•	Alarm Outputs of up to Four Points (Optional )
•	Optional 256 K Memory Card for Increased Data Storage
•	Optional GPIB or RS-232C Interface
•	250 mm (10") Chart
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The easy-to-operate OMEGA® RD3721 and RD3722 flatbed pen recorders are sophisticated, high performance units which accept a wide range of input types. Features include a choice of measured data, bar graph or range data display modes. Versatile optional capabilities include GPIB or RS232C interface to handle data output and panel setting data, a memory card with a capacity of 256 K, mathematical functions, remote controls, alarms, outputs up to four points and °F range data display. The RD3721 comes with an electronic pen lift and printer. The RD3722 comes with a manual pen lift. Both units provide high speed recording (1600 m/sec max), an auto span shift mode and partially expanded-scale recording, whereby any portion within full scale can be expanded or reduced for each pen.

SPECIFICATIONS
Measurements
Drive System: Automatic null-balancing digital servo mechanism with brushless DC servomotor
Type of Input: dc V, 1 mV to 200V FS; T/C Types J, K, E, T, N, C, J DIN, T DIN, R, S, B, Kp vs Au7Fe; RTD Pt100, Pt50, Ni100 Reference Junction Compensating
Accuracy (T/C): ±0.5°C (10.9°F) for K, E, J, T, N, C, J DIN, T DIN (and KP vs Au7Fe); 1°C for R, S and B
Filter: 0.1, 1 Hz or OFF (selectable)
Zero Set: Adjustable
Measuring Cycle: 135 Hz
Standard Pen Offset Compensation: Average, max/min recording selectable, resolution on time axis: 0.05 mm, automatic sweep function for pen offset, data selectable pen offset compensation reference pen
Input Impedance: Approx 1Ω (Vdc and thermocouple)
Allowable Source Resistance: <1 KΩ (Vdc and thermocouple)
Temperature Coefficient:
Zero Drift: 0.05 µV/°C +0.01% of range/°C
Full Scale: 0.01% of range/°C Maximum Allowable Input Voltage: 250 Vdc
Maximum Common Mode Voltage: 250 Vrms AC
Common Mode Rejection: More than 150 dB at AC
Normal Mode Rejection: More than 50 dB at 50 or 60 Hz

Recording And Printing
Pens: Disposable felt-tip pen cartridges (analog data)
Printing System: Wire-dot printer using ribbon cassette (digital data)
Effective Recording Span: 250 mm (analog data)
Pen Offset Between Channels: Approx 4 mm on the time axis
Number of Channels: 1, 2, 3, or 4
Recording Colors: First pen is red, second pen is green, third pen is blue, fourth pen is brown
Recording Accuracy: Measurement accuracy plus ±0.2% of effective recording span (including non-linearity, deadband and error between ranges)
Maximum Pen Speed: Approx 1600 mm/s (63 in/s)
Maximum Pen Acceleration: Approx 8G
Printing Rate: Approx 1.5 sec/line (for RD3721 only)
Chart: Z-fold chart, 270 mm x 20 m (10.6" x 65'); optional roll chart, 270 mm x 20 m (10.6" x 65')
Chart Speeds: 10 to 1200 mm/min and mm/h (1 mm steps), and 0.5 to 45.0 in/min and in/hr (0.1" steps)
Change of Chart Speed (Optional): Changes chart speed with remote control signals
Record ON/OFF Selectors: Independently provided for each channel on front panel (ON: measurement/recording, OFF: measurement)
Pen Lift: All pens are lifted and lowered simultaneously (for RD3721 only)
Chart Drive: Pulse motor drive
Chart Speed Accuracy: ±0.1% (at recording of longer than 1 m)
Digital Data Printout: Time, chart speed, channel number (tag number), measured data and engineering unit are printed out at the following intervals:

Chart Speed (1 mm = 0.03937)
mm/min	mm/h	Printing Intervals
1200 to 300	–	1 min
299 to 30	–	10 min
29 to 10	1200 to 120	1 h
–	199 to 60	2 h
–	59 to 40	3 h
–	39 to 20	4 h
–	19 to 10	12 h

Tag Number Printout: Tag number can be printed out in place of channel number, up to 7 alphanumerics (for RD3721 only)
Alarm Printout: Channel number, alarm type and the time of alarm ON/ OFF are printed (for RD3721 only)
Scale Markings Printout: 0% and 100% scale values can be printed out at the same interval as digital printout (for RD3721 only)
Program List Printout: Contents of entire setting memory can be listed on the chart (for RD3721 only)
Manual Printout: Time and measured data for all channels can be printed out in a single line by depressing the MANUAL PRINT key (for RD3721 only)
Message Printout: Message of up to 70 characters can be printed by depressing the MANUAL MESSAGE key (message 0), or by external contact signal (message 1 to 4; optional, up to 4 channels), for RD3721 only
Change of Chart Speed Printout: Chart speed and time can be printed out at the change of chart speed (for RD3721 only)
Pen Offset Compensation: ON/OFF Printout: ON/OFF mark and time can be printed out (for RD3721 only)
Change of Range Printout: Changed contents and time can be printed at the change of range, on auto span shift mode (for RD3721 only)
Partially Expanded-Scale Recording: Any portion within full scale can be expanded or reduced for each channel
Auto Span Shift Mode: Automatically shifts to ±50% of span, and recording continues when the input exceeds the measuring span
External Input Span: Small error of external converter can be corrected by setting the span with actual input voltage (zero is span left, full is span right)

Display
Type of Display: Vacuum fluorescent display (5 x 7" dot matrix, blue), 20 characters for each channel
Display Modes: 3 display modes can be selected by depressing the DISPLAY SELECT key
Digital Data Display: Measured data (7 digits), date, time and chart speed;
Bar Graph Display: (2.5% resolution) Range Data Display

Alarms
Number of Alarm Set Levels: Up to 2 levels/channel
Alarm Types: High (H), low (L), delta high (dH), and delta low (dL)
Alarm Outputs (Optional): Up to 4 points (internal, contact rating: 24 Vdc and AC 1 A)

Computing Functions
Standard Functions: Scaling (ranges: -22000 to +22000), and ØT
Standard Memory Card: For storing and setting data (memory capacity of 8 K), comes with lithium battery (with life of about 5 years)
Battery Back-Up Memory: Maintains all settings for about 10 years (at room temperature) when power is removed
Chart END Alarm: Automatic pen lift (for RD3721 only) at out-of-chart condition (alarm output, optional)
Mounting: Horizontal (can be tilted up to 10%)
Operating Range: 0 to 40°C (32 to 104°F); 0 to 80% RH
Insulation Resistance: More than 100 MΩ at 500 Vdc between power line and case, and between input terminals and case
Dielectric Strength: 1500 Vac for 1 minute between power line and case, and between input terminals and case
Power Requirements: 90 to 250 Vac, for both 50 and 60 Hz
Power Consumption: 1-channel model, 85 VA max, 45 VA balanced; 2-channel model, 100 VA max 50 VA balanced; 3-channel model, 115 VA max, 55 VA balanced; 4-channel model, 130 VA max, 60 VA balanced
Dimensions: 185 H x 448 W x 455 D mm (71.4 x 175.8 x 177.8")
Weight: from 14 kg (25.4) to 13.5 kg (29.8 lb) depending on configuration

Alarm Option (-AK04)
Number of Outputs: 4 points
Contact Rating: 24 Vdc and AC 1 A
Outputs: Alarm, FAIL alarm and chart END alarm outputs

GPIB Interface (-GPIB)
Functional, Electrical and Mechanical Specifications: Meets the IEEE Standard of 488-1978
Talker Functions: Input of measured data (ASCII), output of measured data (ASCII and binary), input/output of setting data (ASCII), output of memory data (ASCII and binary)
Listener Functions: Controls except for power ON/OFF key lock ON/OFF and chart drive

RS232C Interface (-RS232)
Functional, Electrical and Mechanical Specifications: Meets the EIA RS-232C
Controller Interface Functions: Input of measured data (ASCII), output of measured data (ASCII and binary), input/output of setting data (ASCII), output of memory data (ASCII and binary)
Data Transfer Rates: 75, 150, 300, 600, 1200, 2400, 4800, 9600 bps

Remote Controls (-REM)
Remote Control Signals: External contact, open collector of TTL-level signal
Chart Drive Control: Start, L logic level or closed contact; stop, H logic level or open contact
Message Printout: Start, L login level or closed contact (for RD3731 only)
Change of Chart Speed: Chart speed 2, L logic level or closed contact, chart speed 1, H logic level or open contact
Pen Lift: All recording pens lowered, L logic level or closed contact; all recording pens lifted, H logic level or open contact (for RD3721 only)
Record On/Off Selection: OFF (Measurement), L logic level or closed contact; OFF (measurement/ recording), H logic level or open contact
External Trigger: Data memory write, L logic level or closed contact
Math Option (-MATH): +, -, x, ÷, square root, absolute value, logarithm, exponential function (up to 4 channels); not available for 1-pen model

Memory Card (RD-MC256)
Function: Setting and measured data memory
Sampling Rate: Free mode (manual start), 135, 9, 5, 3, 1, 0.5, 0.2 Hz, trigger mode (starts by trigger conditions), 9, 5, 3, 1, 0.5, 0.2 Hz
Memory Capacity: 256 K
Data Length: 1000, 2000, 4000, 8000, 16000, 32000 data/channel (common setting to each channel, 2 bytes/data)
Trigger Condition: Alarm detection, CHART END or external contact input (optional)
Pre-Trigger: 0 to 100% (10% steps)
Memory Data: Measured, interface input and computed data
Output: Communication interface and recording output
Standard Accessory: Lithium battery, shelf life of three years

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