Omega Products OM7-21 User Manual

H-33

The OM7 Series modular isolation-based, singlechannel 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

OM7 Series Modular Signal Conditioning System

Accepts a Wide Range of Inputs

⻬ Isolated Signal Conditioners for a

Wide Range of Process Control Signals: Thermocouples, RTDs, mA, mV, V

⻬ Process Current (4-20 and 0-20 mA)

Output Module

⻬ Powered mA Input Module Includes

Isolated 24 Vdc Power for a Remote Transmitter

⻬ Bipolar Voltage Input and Output

Modules

⻬ Operates From a Single 24 Vdc

Power Supply

⻬ Provides 1-5 V, 0-10 V, and

±10 V Output Options

⻬ ±0.1% Max. Accuracy, Factory Calibrated ⻬ 1500 V rms of CMV Isolation and

120 V rms Field Wiring Protection

⻬ Compact, 54 x 42 x 14 mm

(2.1 x 1.7 x 0.6" ) Plastic Housing

Extended Warranty

Program

A/IN

A/OUT

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 OM739 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.

H-34

KMTSS-125G-6 thermocouple

probe sold separately, $24.

OM7 Series

103

Module Starting Price

Shown smaller than actual size.

Extended Warranty

Program

A/IN

A/OUT

H-35

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 Hz bandwidth.

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 dB bandwidth 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

internallinearization 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 100Ω platinum and 120Ω

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.

Modular Signal Conditioning System

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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 850Ω.

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 Ω 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

Shown with optional KMTSS-125G-6 Thermocouple sold seperately, $24

Model OM7-21 OM7-30 OM7-31 OM7-32 OM7-33 OM7-34 OM7-35 OM7-37 OM7-47

Input ±10 V ±1 mV ±1 V 4-20 mA 1-5 V RTD 4-20 mA T/C* T/C* Type to ±1V to ±10 V 0-20 mA 0-5 V

Output ±10 V 1-5 or 1-5 or 1-5 or 1-5 or 1-5 or 1-5 or 1-5 or 1-5 or Range 0-10 V 0-10 V 0-10 V 0-10 V 0-10 V 2-10 V 0-10 V 0-10 V (into 2 kΩ min load)

Accuracy ±0.1% ±0.1% ±0.1% ±0.1% ±0.1% See table ±0.1% ±0.1% See table

span max span max span max span max span max span max span max

Nonlinearity ±0.02% ±0.02% ±0.02% ±0.02% ±0.02% See table ±0.02% 0.02% N/A

span max span max span max span max span max span max span max

Input 2 MΩ 10 MΩ 100 kΩ 200 Ω 2 MΩ N/A N/A 10 MΩ 10 MΩ Resistance

Input Bias 3 nA 1 nA 0.2 nA N/A 0.1 nA N/A N/A 25 nA 25 nA Current

Nominal 3 db Bandwidth 300 Hz 3 Hz 3 Hz 100 Hz 100 Hz 3 Hz 100 Hz 3 Hz 3 Hz

Response 1 msec 150 msec 150 msec 10 msec 10 msec 250 msec 5 msec 150 msec 150 msec Time, 0-90%

CJC Accuracy, NA NA NA NA NA NA NA ±1.0°C ±1.0°C Ambient Temp. max. max. 5 to 45°C

Supply

19-29 VDC 14-35 VDC 14-35 VDC 14-35 VDC 14-35 VDC 14-35 VDC 18-35 14-35 VDC 14-35 VDC

Voltage Supply 35 mA 25 mA 25 mA 20 mA 20 mA 25 mA 60 mA 25 mA 25 mA

Current

Modular Signal Conditioning System

* T/C is thermocouple

OM7 modules shown mounted on OM7-BP-4-C 4-channel backplane, $130.

KMTSS-125G-6 thermocouple sold separately, $24.

Shown smaller than actual size.

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Output Module Specifications

OM7 Series Input Module Specifications (typical @23°C and + 24 Vdc)

Model OM7-22 OM7-39

Output Range ±10 V 0-20 mA

4-20 mA

Input Range ±10 V 0-10 V

1-5 V

Accuracy ±0.1% Span ±0.1% Span Nonlinearity ±0.02% Span ±0.02% Span Output Offset ±0.001% Span/C ±0.0035% Span/C Max. Output ±14 Vdc 30 Ma Load Resistance* 5 K⍀m min. 0-850⍀ Nominal 3 db Bandwidth 400 Hz 100 Hz Response Time, 0-90% 1 ms 3 ms

Common Mode Voltage 1500 V rms 1500 V rms

Supply Voltage 19-29 Vdc 14-35 Vdc Supply Current 20 mA max 60 mA max

*Load resistance of OM7-39 dependent on power supply

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-N-01-X-C 0 to +300°C ±0.3% ±0.012% OM7-N-02-X-C 0 to +200°C ±0.3% ±0.14%

OM7-34 Linearized RTD Input Module

(@ +23°C ±5°C and Vs= +24Vdc)

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.

Connectors: Three screw terminals are provided for field connection to sensors/signals. 25-pin D-type male connector provided for interface to user’s system.

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Backplane Specifications

OM7-BP-1-C OM7-BP-2-C OM7-BP-4-C OM7-BP-8-C OM7-BP-16-C

(DIN-C) (DIN-C) (DIN-C) (DIN-C) (DIN-C)

Channels 1 2 4 8 16 Size 4.25 x 1.37" 4.25 x 1.37" 3.47 x 6.3" 3.47 x 10" 3.47 x 17.4"

Input Accuracy

1,2

Accuracy

Model Range (typical) (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.

OM7 Series

OM7-BP-8-C shown with OM7 modules. KMTSS-125G-6 thermocouple sold

separately, $24.

OM7-47 Linearized Thermocouple Input Module

(@ +23°C ±5°C and Vs= +24Vdc)

Omega Products OM7-21 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual