The OM7 Series modular isolation-based, single channel plug-in signal conditioning system accepts
inputs from a wide range of process control transducers and signals while providing high-level output voltages.
Featuring a maximum nonlinearity of 0.02% and factory calibrated to guarantee maximum accuracy of ±0.1%,
the OM7 Series offers superior performance at a lower cost than multipurpose signal conditioners. The
modules provide 1500 V rms isolation and 120 V rms of field wiring input protection. The power supplies
necessary to drive each individual module’s input circuitry are internally isolated, enabling the OM7
modules to offer true channel-to-channel isolation of the input signals. The modules are rated for a nominal
power supply input of +24 Vdc and, for maximum flexibility, will accept supply voltages in the +14 Vdc to
+35 Vdc range.
All modules are packaged in a compact 54 x 42 x 14 mm (2.1" x 1.7" x 0.6") durable plastic case that
readily accommodates high channel density applications. Each module may be operated in high
humidity (noncondensing) environments and is rated over the extended -40 to 85°C industrial temperature
range. All modules feature a simple pinout that allows them to be mixed and matched within a single
backplane design. Furthermore, modules are easily serviced since they can be removed and inserted into
the backplane with power applied.
Modules are available to isolate and condition the following input signals and transducers: voltage,
process current, RTD, 2-wire transmitter, and thermocouples. The 2-wire transmitter interface
module (OM7-35) accepts a 4-20 mA process input and provides an isolated +24 Vdc supply to power the
current loop. In this way, a loop-powered transmitter can be directly connected to the OM7-35 without
requiring a separate power supply. All of the isolated input modules, with the exception of the OM7-21,
provide a high-level output voltage that is factory configured for either the 1-5 V or 0-10 V range. The
OM7-21 is a unity gain, isolated input module with an input/output range of ±10 V.
Modules are also available that provide isolated output signals for process current and bipolar voltage.
The OM7-39 process current module converts either a 1-5 V signal to a 4-20 mA output or a 0-10 V input to a
0-20 mA output. The input/output ranges of the OM7-39 are factory configured. The OM7-22 is a unity gain
module that provides an isolated ±10 V output signal.
A full line of backplanes and rack-mount hardware complete the OM7 Series signal conditioning system.
Each backplane contains screw terminals for field wiring connections and a miniature cold junction
compensation (CJC) thermistor that is installed under the terminal blocks of each channel. Due to the pinout
of the OM7 Series modules, the CJC thermistor affects only the thermocouple modules. This flexibility permits
any module type to be used in any channel on the backplane.
ISOLATED VOLTAGE AND CURRENT INPUT
The OM7 Series feature five isolated voltage/current input modules capable of addressing
a wide variety of input voltage ranges and signal dynamics. The OM7-21 is a bipolar unit
module featuring a full-scale range of ±10 V. The OM7-30 and OM7-31 accept dc
input voltages and provide either a factory configured 1-5 V or 0-10 V output signal.
The OM7-32 accepts a 4-20 mA process current input signal and provides an output
voltage signal in the 1-5 V range. The OM7-33 isolates a 1-5 V input
signal and provides a buffered 1-5 V output signal. The OM7-32 and
OM7-33 can also be factory configured to provide a 0-10 V output signal with a 0-20 mA or 0-5
V input, respectively. Both the OM7-32 and OM7-33 have bandwidths of 100 Hz. The OM7-
30 and OM7-31 are limited to 3 Hzbandwidth.
ISOLATED THERMOCOUPLE INPUT
The OM7-37 and OM7-47 modules accept inputs from types J, K, T, E, R, S, and B thermocouples and
provide a 1-5 V or 0-10 V output signal. The OM7-47 also accepts inputs from type N thermocouples.
Both the OM7-37 and OM7-47 have a nominal 3 dBbandwidth of 3 Hz, and they provide for upscale open
input detection within 10 sec.
In addition to the signal conditioning capabilities of the OM7-37, the OM7-47 includes
an internal linearization circuit that compensates for the inherent
nonlinearities of the thermocouple. With this linearizer, the OM7-47 is
able to provide an output voltage that is linear with respect to the
actual temperatures being measured by the thermocouple.
The thermocouple input modules accomplish CJC by means of an external thermistor mounted under
the field wiring screw terminal blocks of the backplane.
ISOLATED LINEARIZED RTD INPUT
The OM7-34 module accepts inputs from 100. platinum and 120. nickel RTDs and produce an output
voltage signal that is proportional with temperature measured by the RTD. The OM7-34 modules are
available in a factory-configured 1-5 V or 0-10 V output range. Three-wire lead resistance
compensation is provided and 2- or 3-wire RTDs may be used. The OM7-34 RTD input module has
a nominal 3 dB bandwidth of 3 Hz and upscale open RTD detection with 10 sec.
ISOLATED 2-WIRE TRANSMITTER INTERFACE
The OM7-35 input module accepts a 4-20 mA process current input, provides a standard 1-5 V output
signal, and features an isolated loop power supply for driving the current transmitter. The module
has a nominal 3 dB bandwidth of 100 Hz and offers downscale open input detection within 2 sec.
The isolated transmitter loop power supply of the OM7-35 is unregulated and will provide a
voltage that is proportional to the voltage used to power the OM7-35 module. The voltage provided by
the OM7-35 is between 13 V and 34 V for loop current between 4 mA and 20 mA and supply voltages
between 20.4 and 26.4 V. (For nominal +24 V supply, the OM7-35 will supply approximately +24 V to
the loop.)
ISOLATED CURRENT OUTPUT
The OM7-39 isolated output module accepts either a factory-configured 1-5 V or 0-10V
input signal and provides an isolated 4-20 mA or 0-20 mA output current signal. The module can
drive a wide range of resistive loads, depending upon +Vs, the supply voltage. At a nominal +Vs of
+24 V, the OM7-39 will drive up to 850..
ISOLATED BIPOLAR VOLTAGE OUTPUT
The OM7-22 is a unity-gain module with an input/output range of ±10 V. The OM7-22 has an input range of
±10 V and provides an isolated bipolar ±10 V output signal to the field.
The OM7-22 features 1500 V rms of CMV isolation, 100 dB minimum of common mode rejection, and a
400 Hz bandwidth.
OM7 Specifications: OM7 Common Input Module Specifications Common Mode Voltage: 1500 V rms continuous Input Protection: 120 V rms continuous Output Protection: Short to ground Output Resistance: <1 ohm Common to All Modules Operating Range: -40 to 85°C (-40 to 185°F) Storage Range: -40 to 85°C (-40 to 185°F) Humidity (24 hr): 90% non-condensing WEIGHT: 60 G (0.2 OZ)
OM7 Series Input Module Specifications (typical @23°C and + 24 Vdc)
*Load resistance of OM7-39 dependent on power supply
OM7-34 Linearized RTD Input Module (@ +23°C ±5°C and Vs = +24Vdc)
Model
Input Range
Accuracy
Nonlinearity
OM7-34-01-X-C
-100 to +100°C
±0.15%
±0.05%
OM7-34-02-X-C
0 to +100°C
±0.2%
±0.05%
OM7-34-03-X-C
0 to +200°C
±0.15%
±0.05%
OM7-34-04-X-C
0 to +600°C
±0.1%
±0.05%
OM7-34-N-01-X-C
0 to +300°C
±0.3%
±0.012%
OM7-34-N-02-X-C
0 to +200°C
±0.3%
±0.14%
NOTES:
The X in the OM7-34 model number designations in the above table is
used to identify the output voltage range option. If X=1, then the OM7-34
is factory configured for a 1-5 V output; and if X=2, then the OM7-34 is
factory configured for a 0-10 V output. The Standard Range OM7-34s
(i.e., OM7-34-01, OM7-34-02, OM7-34-03, OM7-34-04) are configured
for a Platinum RTD with the DIN standard alpha of 0.00385.
The OM7-34-N Series is configured for Nickel RTDs.
OM7-34 Linearized RTD Input Module (@ +23°C ±5°C and Vs = +24Vdc)
Model
Input Range
Accuracy1,2 (typical)
Accuracy1 (max)
OM7-47-J-01-1-C
0 to +760°C
0.15% span
0.38% span
OM7-47-J-01-2-C
0 to +760°C
0.13% span
0.32% span
OM7-47-J-02-1-C
-100 to +300°C
0.16% span
0.35% span
OM7-47-J-02-2-C
-100 to +300°C
0.14% span
0.30% span
OM7-47-K-03-1-C
0 to +1300°C
0.15% span
0.35% span
OM7-47-K-03-2-C
0 to +1300°C
0.15% span
0.32% span
OM7-47-K-04-1-C
0 to +600°C
0.09% span
0.20% span
OM7-47-K-04-2-C
0 to +600°C
0.08% span
0.18% span
OM7-47-T-05-1-C
0 to +400°C
0.24% span
0.50% span
OM7-47-T-05-2-C
0 to +400°C
0.19% span
0.38% span
OM7-47-T-06-1-C
-100 to +200°C
0.29% span
0.57% span
OM7-47-T-06-2-C
-100 to +200°C
0.25% span
0.47% span
OM7-47-E-07-1-C
0 to +900°C
0.18% span
0.41% span
OM7-47-E-07-2-C
0 to +900°C
0.15% span
0.34% span
OM7-47-R-08-1-C
+500 to +1750°C
0.15% span
0.36% span
OM7-47-R-08-2-C
+500 to +1750°C
0.13% span
0.30% span
OM7-47-S-09-1-C
+700 to +1750°C
0.13% span
0.31% span
OM7-47-S-09-2-C
+700 to +1750°C
0.11% span
0.25% span
OM7-47-B-10-1-C
+800 to +1800°C
0.19% span
0.41% span
OM7-47-B-10-2-C
+800 to +1800°C
0.17% span
0.35% span
OM7-47-N-11-1-C
+200 to +1300°C
0.14% span
0.31% span
OM7-47-N-11-2-C
+200 to +1300°C
0.09% span
0.27% span
1) The CJC sensor accuracy should be added to the
module accuracy listed in this table in order to compute
the overall measurement accuracy.
2) Accuracy includes the effects of repeatability,
hysteresis, and conformity.
2-Wire Transmitter Inputs with Loop Power (with Sense Resistor)
Model No.
Input Range
Output Range
OM7-35-01-1-C
4-20 mA
1 -5 V
OM7-35-01-2-C
4-20 mA
0-10 V
Output Modules
Model No.
Input Range
Output Range
OM7-22-C
±10 V
±10 V
OM7-39-01-C
1-5 V
4-20 mA
OM7-39-02-C
0-10 V
0-20 mA
Backplanes
Model No.
Description
OM7-BP-1-C
1 Channel backplane
OM7-BP-1-DIN-C
1 Channel backplane DIN Rail
OM7-BP-2-C
2 Channel backplane
OM7-BP-2-DIN-C
2 Channel backplane DIN Rail
OM7-BP-4-C
4 Channel backplane
OM7-BP-4-DIN-C
4 Channel backplane DIN Rail
OM7-BP-8-C
8 Channel backplane
OM7-BP-8-DIN-C
8 Channel backplane DIN Rail
OM7-BP-16-C
16 Channel backplane
OM7-BP-16-DIN-
16 Channel backplane DIN Rail
RAIL-35-2
35mm Din Rail, 2 Meter Length
Cables
Model No.
Description
OM7-CA-01
6" cable (25-pin, D-type connector to 26-pin male header connector) converts OM7 backplane connector to an OM5 backplane connector pin out
OM7-CA-02
3-foot cable (25 pin, D-type connector on both ends)
Accessories
Model No.
Description
U24Y175
Power supply (105-125/210-250 VAC input, 24 VDC @ 175 mA output
OM7-PROTO
OM7 Breadboard kit
OM7-BP-EV
1 Channel evaluation
OM7-IF
Universal interface board
OM7-RK002
19” rack for mounting backplane
OM7-RI
250ohm current conversion resistor
OM7-DIN-SF
DIN Base element with snap foot
OM7-DIN-WSF
DIN Side element without snap foot
OM7-DIN-SE
DIN Side elements
OM7-DIN-CP
DIN Connector pins
† All dollar amounts on this site are shown in US currency.
Part Number Builder
Option Descriptions
(1)
Model
Select -21 for Model 21 -30 for Model 30 -31 for Model 31 -32 for Model 32 -33 for Model 33 -34 for Model 34 -35 for Model 35 -37 for Model 37 -39 for Model 39 -47 for Model 47
(2)
Thermocouple Type
Select for No options leave blank -J for J Type -K for K Type -T for T Type E for E Type -R for R Type -S for S Type -B for B Type -N for N Type
(3)
Code in the Partnumber
Select for No options leave blank -01 for Code 01 -02 for Code 02 -03 for Code 03 -04 for Code 04 -05 for Code 05 -06 for Code 06 -07 for Code 07 -08 for Code 08 -09 for Code 09 -10 for Code 10 -11 for Code 11 -12 for Code 12 -13 for Code 13 -20 for Code 20 -21 for Code 21 -22 for Code 22 -23 for Code 23
(4)
Output Type
Select for No options leave blank -1 for 1-5 V -2 for 0-10 V
NOTE: All combinations may not be valid, check spec sheet for valid part numbers.
