Each SCM5B34 RTD input module provides a single channel of RTD input which is filtered, isolated, amplified, linearized, and converted to a high-level analog voltage output. This voltage output is logic switch controlled, which allows these modules to share a common analog bus without the requirement of external multiplexers.

The SCM5B modules are designed with a completely isolated computer side circuit which can be floated to ±50V from Power Common, pin 16. This complete isolation means that no connection is required between I/O Common and Power Common for proper operation of the output switch. If desired, the output switch can be turned on continuously by simply connecting pin 22, the Read-Enable pin, to I/O Common, pin 19.

RTD excitation is provided from the module by two matched current sources. When using a three-wire RTD, this method allows an equal current to flow in each RTD lead, which cancels the effects of lead resistances. The excitation currents are very small (0.25mA for 100 Ohm Pt and 120 Ohm Ni, and 1.0mA for 10 Ohm Cu) which minimizes self-heating of the RTD.

Signal filtering is accomplished with a six-pole filter which provides 95dB of normal-mode rejection at 60Hz and 90dB at 50Hz. Two poles of this filter are on the field side of the isolation barrier, and the other four are on the computer side. After the initial field-side filtering, the input signal is chopped by a proprietary chopper circuit. Isolation is provided by transformer coupling, again using a proprietary technique to suppress transmission of common mode spikes or surges. The module is powered from +5VDC, ±5%.

A special input circuit on the SCM5B34 modules provides protection against accidental connection of power-line voltages up to 240VAC.
  • Interfaces to 100 Ohm Platinum, 10 Ohm Copper, or 120 Ohm Nickel RTDs
  • Linearizes RTD Signal
  • High-Level Voltage Outputs
  • 1500Vrms Transformer Isolation
  • ANSI/IEEE C37.90.1 Transient Protection
  • Input Protected to 240VAC Continuous
  • 160dB CMR
  • 95dB NMR at 60Hz, 90dB at 50Hz
  • CSA Certified, FM Approved, CE and ATEX Compliant
  • Mix and Match SCM5B Types on Backpanel
Linearized 2- or 3-Wire RTD Input Modules

SCM5B34 Devices


Part Number Input ConfigurationRTD TypeInput RangeOutput RangeMechanical Format
2 & 3 Wire 100 Ohm Platinum -100 to 100 (°C) 0 to +5 V Modular plug-in-board
2 & 3 Wire 100 Ohm Platinum -100 to 100 (°C) 0 to +10 V Modular plug-in-board
2 & 3 Wire 100 Ohm Platinum 0 to 100 (°C) 0 to +5 V Modular plug-in-board
2 & 3 Wire 100 Ohm Platinum 0 to 100 (°C) 0 to +10 V Modular plug-in-board
2 & 3 Wire 100 Ohm Platinum 0 to 200 (°C) 0 to +5 V Modular plug-in-board
2 & 3 Wire 100 Ohm Platinum 0 to 200 (°C) 0 to +10 V Modular plug-in-board
2 & 3 Wire 100 Ohm Platinum 0 to 600 (°C) 0 to +5 V Modular plug-in-board
2 & 3 Wire 100 Ohm Platinum 0 to 600 (°C) 0 to +10 V Modular plug-in-board
2 & 3 Wire 100 Ohm Platinum -100 to 200 (°C) 0 to +5 V Modular plug-in-board
2 & 3 Wire 100 Ohm Platinum -100 to 200 (°C) 0 to +10 V Modular plug-in-board
2 & 3 Wire 10 Ohm Copper 0 to 120 (°C) 0 to +5 V Modular plug-in-board
2 & 3 Wire 10 Ohm Copper 0 to 120 (°C) 0 to +10 V Modular plug-in-board
2 & 3 Wire 10 Ohm Copper 0 to 120 (°C) 0 to +5 V Modular plug-in-board
2 & 3 Wire 10 Ohm Copper 0 to 120 (°C) 0 to +10 V Modular plug-in-board
2 & 3 Wire 10 Ohm Copper 0 to 160 (°C) 0 to +5 V Modular plug-in-board
2 & 3 Wire 10 Ohm Copper 0 to 160 (°C) 0 to +10 V Modular plug-in-board
2 & 3 Wire 120 Ohm Nickel 0 to 300 (°C) 0 to +5 V Modular plug-in-board
2 & 3 Wire 120 Ohm Nickel 0 to 300 (°C) 0 to +10 V Modular plug-in-board



Frequently Asked Questions


Can SCM5B modules be hot swapped?
Not just SCM5B modules, but any signal conditioning module series and MAQ20 I/O modules can be hot swapped. A minimal amount of signal settling time may result, but there will be no damage to the device.

Can Dataforth provide calibration reports for modules I purchased?
Yes we can provide calibration reports for the modules that you purchased.

You can either
a) visit https://www.dataforth.com/TestDataReport.aspx to search for Test Report Datasheets by Serial Number or
b) you can send us a list of model numbers and their serial numbers to support@dataforth.com

Is the calibration of Dataforth modules traceable to NIST standards?
Yes, calibration of Dataforth modules is traceable to NIST standards.

Analog Devices announced a last time buy and discontinuance of their signal conditioning modules. Can I replace them with Dataforth signal conditioning modules?
Yes, in general, Dataforth signal conditioning modules are a direct replacement for all Analog Devices signal conditioning modules. e.g. "SCM5B35-xx: Linearized 4-Wire RTD Input Modules" will replace Analog Devices "5B35: Isolated 4 Wire RTD Input Signal Conditioning Module".

Please note that Dataforth signal conditioning modules are RoHS II compliant.

What is the recommended power supply for Dataforth SCM5B and 8B modules?
The recommended power supply for the Dataforth SCM5B and 8B modules are the linear power supplies in our SCMXPRT/SCMXPRE series. The SCMXPRT/SCMXPRE power supplies output 5V and have options for 1A output current (SCMXPRT-001) or 3A output current (SCMXPRT-003).

The SCMXPRE series is identical to its SCMXPRT counterpart, but is configured for European voltage standards.

The SCMXPRT-001/SCMXPRE-001 both have the option for DIN rail mounting as well (SCMXPRT-001D/SCMXPRE-001D).

Other power supplies that meet that power requirements of the SCM5B and 8B modules can be used as well, but it is strongly recommended to use a linear power supply rather than a switch-mode power supply. Switching power supplies can add noise artifacts to the output of your modules.

If I purchase a backplane with no CJC, will I still be able to use modules that require the CJC enable jumper to be installed?
Yes. Backplanes with no CJC will still come with the CJC enable installed on the backplane.

I just received an SCMPB01 back panel. How should I configure jumpers J1 through J4 for my application?
The factory configuration for jumpers J1 through J4 is the optimal configuration for most applications. If for some reason this jumper configuration will not work/is not working in your application, see our application note AN502 "Ground Connections and Host System Interfaces" for other valid jumper configurations and what situations you would use them.

Where can I find the MTBF of my module?
Information on MTBF for SCM5B, SCM7B, 8B and DSCA is available on our website. Please see application note AN802 for more details. Application notes can be found under the "Literature" tab on the top navigation bar.

What does "Response time, 90% span" mean on the datasheet for my module?
Normally, a response time figure refers to how quickly a module's output can "respond" to a change in the input signal. "Response time, 90% span" refers to how fast a module can adjust its output when a step signal is applied at the input, where the magnitude of this step input is 90% of the input span of the module.

Do you have any SCM5B modules with a 50kHz bandwidth?
None of our standard SCM5B modules have a 50kHz bandwidth. However, it is possible to order a custom SCM5B module with 50kHz bandwidth. Keep in mind that new customs require a 10 pc minimum order and are subject to extra design fees.

Where can I find the pinout of my SCM5B module?
Please see the SCM5B Module Dimensions and Pinouts link from the SCM5B section of our website: https://www.dataforth.com/catalog/pdf/scm5bdim.pdf

You can also find the module dimensions and pinouts in our product catalog.

Do you have an MTBF figure for the SCM5B39? What are the main failure modes?
The failure rate calculations for our SCM5B modules can be found in our application note AN503: https://www.dataforth.com/catalog/pdf/an503.pdf

There are no dominant failure modes.

Will the isolation on the SCM5B modules support a discharge of 1500VDC without damaging anything connected to the output?
Yes, the SCM5B modules are isolated up to 1500 Vrms, which means that if the common mode voltage between the field side and system side is limited to 1500Vrms, the device will be protected.

However, the input protection for SCM5B modules (i.e., the voltage across the +IN and -IN input terminals) is 240Vrms max.

If the input range of my signal conditioner is -1V to +1V and the output range is 0 to 10V, does this mean that it ignores polarity?
A signal conditioner with these I/O ranges does not mean that the module ignores the polarity of your voltage input. The output of voltage input modules are scaled linearly, meaning an input of -1V would correspond to an output of 0V, an input of 0V would correspond to an output of 5V, an input of +1V would correspond to an output of 10V, and so on.

How do I convert an RMS voltage to its corresponding peak voltage?
To convert an RMS voltage to its corresponding peak voltage, you simply take the RMS voltage value and multiply it by the square root of 2, or roughly 1.414.

For example, 1500Vrms corresponds to a peak voltage of 1500 * 1.414 = 2121 Vp

Do SCM5B modules with outputs scaled up to 10V have separate power requirements from their 5V counterparts?
No, all SCM5B modules have the same power requirements (5VDC) regardless of their I/O specifications. The power supply current draw of different products in the SCM5B line may vary.

On the SCM5B modules, what is the purpose of pin 18 (Vin), why is it tied to pin 20 (Vout)? Doesn't Vout provide the output by itself?
Vout is used with input modules, which are all the SCM5B models except for the SCM5B39 and SCM5B49. Vin is used for output modules, SCM5B39 and SCM5B49.

The reason for doing this is because input modules acquire a signal from the field side, and then output a corresponding signal to the system side. On the contrary, output modules acquire a signal from the system side, and then output a corresponding signal to the field side. Since SCM5B backplanes are designed for all channels to accommodate either an input or an output module, the terminal/pin that you would normally get your output signal from if you were using an input module is the same terminal/pin that you would be feeding your input signal to if you were using an output module.

Should I ground my sensor wire shield to the 10-32 ground post on the SCMPB01?
It is not recommended to ground the sensor wire shield to the 10-32 ground post on the SCMPB01 because that is the system side ground, while the sensor wire is on the field side. The sensor wire shield should be grounded to the field side ground, which varies based on the signal conditioner you are using. Please see the "Shield Grounding" application note for more information.

Can I use an SCM5B module with my OM5-BP-SKT-C?
Yes, any of our SCM5B modules are able to be mounted and operated on Omega's OM5-BP-SKT-C board.

What is the required resistance for jumpers J1 through J4 on my SCM5B backpanel?
J1-J4 on the SCM5B backpanels are jumper cables, so they should have 0 ohm resistance.

How does the load resistance of a module affect the noise at the output?
Noise at the output of a module is independent of load resistance.

What does it mean when an input module has for example a 3kHz bandwidth?
A 3kHz bandwidth on an input module means it can accept voltages from DC to 3000Hz. Any frequency higher than that and the signal will start to be attenuated by the filter at the input.

Can I use the SCMXBEFE and SCMXSE accessories to make my SCMPB01/2 DIN rail mountable?
No, converting any of the 16 channel SCM5B backplanes to something DIN rail mountable is a much more involved process than the SCMPB03/04. If you would like a 16 channel SCM5B backplane that can mount on a DIN rail you must purchase an SCMPB01-2, SCMPB01-3, SCMPB02-2 or SCMPB02-3.

Is the SCM5B40-06 sensitive to being soldered into a board? Would soldering it damage the part?
We do not recommend soldering the SCM5B pins to a board as it could potentially damage the module. Soldering the pins would also void the warranty.

Many sockets are available which accept the mounting pins. TE Connectivity / AMP part number 50865-5 is an example of these sockets and any equivalent part will work as well.

Do I need to purchase the SCMXCJC with my SCMPB03?
No, the SCMPB03 comes with the CJC built into the backpanel.

What types of DIN rails does the DIN rail mounting of the SCMPB04 attach to?
The DIN rail mounting of the SCMPB04 can mount to DIN rail types EN 50022-35x7.5, EN 50022-35x15, EN 50035-G32. These can be purchased as part numbers SCMXRAIL1-XX, SCMXRAIL2-XX, pr SCMXRAIL3-XX where XX is specified as the length of the rail in meters.

Can the DIN rail mounting hardware be easily removed from the SCMPB04?
Yes, the DIN rail mounting hardware for the SCMPB04 can be easily detached and reattached from the board.

Is the SCMXPRT-003 DIN rail mountable?
The SCMXPRT-001 has an option for DIN rail mounting (part number: SCMXPRT-001D) but the SCMXPRT-003 does not. Instead, it can be mounted on the SCMXRK-002 which is a 19 inch metal rack for mounting the SCMXPRT-003 as well as various Dataforth backpanels and the SCMXIF interface board.

Can I use a copper RTD that is 10 ohm at 25 degrees C with the SCM5B34C-03?
If you were to use a copper 10 ohm at 25 degrees Celsius RTD with the SCM5B34C-03 then your output would be offset by roughly 25 degrees Celsius resulting in incorrect readings. However, if you need an RTD input module with the same input/output specs as the SCM5B34C-03 that works with your RTD, we do offer the custom module SCM5B34C-1526.

What happens to the output of an SCM5B34 module if the input goes below negative full scale?
When the SCM5B34 receives a temperature input signal below negative full scale, the module’s output will drop slightly below 0V non-linearly, no lower than -0.7 to -1V.
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Model NumberInput UnitsInput RangeOutput UnitsOutput RangeBandwidthSensor TypeStatus*Comments
SCM5B34-1029
Temp (°K)77K TO 150KV0V TO +5V4HZ100 OHM PLATINUM RTDQU 
SCM5B34-1030
Temp (°K)77K TO 300KV0V TO +5V4HZ100 OHM PLATINUM RTDQU 
SCM5B34-1031
Temp (°K)77K TO 150KV0V TO +5V4HZ1K OHM PLATINUM RTDQU 
SCM5B34-1032
Temp (°K)77K TO 300KV0V TO +5V4HZ1K OHM PLATINUM RTDQU 
SCM5B34-1045
Temp (°C)-50C TO +200CV0V TO +5V4Hz100 OHM PLATINUM RTDPR0.38C accurate
SCM5B34-1054
Temp (°C)0C TO +300CV0V TO +5V4HZ100 OHM PLATINUM RTDPR0.33C accurate
SCM5B34-1055
Temp (°C)0C TO +100CV0V TO +5V4HZ100 OHM PLATINUM RTDPR0.16C accurate
SCM5B34-1056
Temp (°C)0C TO +200CV0V TO +5V4HZ100 OHM PLATINUM RTDPR0.24C accurate
SCM5B34-1062
Temp (°C)0C TO +200CV+1V TO +5V4HZ100 OHM PLATINUM RTDPR 
SCM5B34-1072
Temp (°F)0F TO +100FV0V TO +5V4HZ100 OHM PLATINUM RTDQU 
SCM5B34-1106
Temp (°C)0C TO +80CV+0.5V TO +4.5V4HZ600 OHM PLATINUM RTDPR 
SCM5B34-1120
Temp (°F) -60F TO +800FV0V TO +5V4HZ50 OHM PLATINUM RTDPR alpha =.00392 I=.5mA
SCM5B34-1121
Temp (°F) -60F TO +800FV0V TO +5V4HZ100 OHM PLATINUM RTDPRalpha =.00392
SCM5B34-1229
Temp (°F)0F TO +500FV0V TO +5V4HZ100 OHM PLATINUM RTDPR 
SCM5B34-1230
Temp (°F)0F TO +500FV0V TO +5V4HZLEWIS NICKEL RTDPR 
SCM5B34-1263
Temp (°C)0C TO +40CV0 TO +5V4HZ100 OHM PLATINUM RTDQU> 0.3mA excitation current
SCM5B34-1277
Temp (°F)-250F TO +250FV0 TO +5V4HZ500 OHM PLATINUM RTDPR 
SCM5B34-1278
Temp (°F)+32F TO +212FV0 TO +5V4HZ500 OHM PLATINUM RTDPR 
SCM5B34-1279
Temp (°F)+32F TO +1152FV0 TO +5V4HZ500 OHM PLATINUM RTDPR 
SCM5B34-1292
Temp (°C)-100C TO +200CV0 TO +5V4HZ100 OHM PLATINUM RTDQU 
SCM5B34-1302
Temp (°F)+32F TO +392FV0V TO +5V4HZ500 OHM PLATINUM RTDPR 
SCM5B34-1313
OHM195 OHM TO 450 OHMV+0.5V TO +4.5V4HZTHERMISTORQU 
SCM5B34-1315
Temp (°C)0C TO +60CV+0.5V TO +4.5V4HZ100 OHM PLATINUM RTDQU 
SCM5B34-1316
Temp (°C)0C TO +100CV+0.5V TO +4.5V4HZ100 OHM PLATINUM RTDQU 
SCM5B34-1317
Temp (°C)0C TO +155CV+0.5V TO +4.5V4HZ100 OHM PLATINUM RTDQU 
SCM5B34-1318
Temp (°C)0C TO +200CV+0.5V TO +4.5V4HZ100 OHM PLATINUM RTDQU 
SCM5B34-1319
Temp (°C)0C TO +270CV+0.5V TO +4.5V4HZ100 OHM PLATINUM RTDQU 
SCM5B34-1320
Temp (°C)0C TO +400CV+0.5V TO +4.5V4HZ100 OHM PLATINUM RTDQU 
SCM5B34-1321
Temp (°C)0C TO +320CV+0.5V TO +4.5V4HZ100 OHM PLATINUM RTDQU 
SCM5B34-1322
Temp (°C)0C TO +100CV+0.5V TO +4.5V4HZ200 OHM PLATINUM RTDQU 
SCM5B34-1323
Temp (°C)0C TO +200CV+0.5V TO +4.5V4HZ200 OHM PLATINUM RTDQU 
SCM5B34-1324
Temp (°C)0C TO +320CV+0.5V TO +4.5V4HZ200 OHM PLATINUM RTDQU 
SCM5B34-1331
Temp (°C)0C TO +1000CV0V TO +5V4HZ1000 OHM PLATINUM RTDQU 
SCM5B34-1445
Temp (°F)-65F TO +300FV0V TO 5V4HZ500 OHM PLATINUM RTDPR 
SCM5B34-1464
Temp (°C)-50C TO +250CV0V TO +5V4HZ100 OHM PLATINUM RTDPR 
SCM5B34-1502
Temp (°C)0C TO +100CV0V TO +5V4Hz100 OHM PLATINUM RTDPRSame as SCM5B34-02T, without open input detection
SCM5B34-1505
Temp (°F)-175F TO +600FV0V TO +5V4Hz100 OHM PLATINUM RTDPR 
SCM5B34-1507T
Temp (°C)0C TO +200CV0V TO +5V4Hz100 OHM PLATINUM RTDQUSame as SCM5B34-03T, without open input detection
SCM5B34-1529
Temp (°C)0C TO +200CV0V TO +5V4Hz1000 OHM PLATINUM RTDPTSame as A5B34-03-5021
SCM5B34-1537
Temp (°C)-200C TO +400CV0V TO +5V4Hz100 OHM PLATINUM RTDPR 
SCM5B34-1562
Temp (°C)-200C TO +100CV0V TO +5V4HZ100 OHM PLATINUM RTDPR 
SCM5B34-1567
Temp (°C)0C TO +200CV0V TO +5V4HZ100 OHM PLATINUM RTDPRAlfa = 0.00392
SCM5B34-1622
Temp (°C)0C TO +100CV0V TO +5V4HZ100 OHM PLATINUM RTDPRSimilar to SCM5B34-02, open input to upscale
SCM5B34-1623
Temp (°C)-100C TO +100CV0V TO +5V4HZ100 OHM PLATINUM RTDPRSimilar to SCM5B34-01, open input to upscale
SCM5B34-1624
Temp (°C)0C TO +200CV0V TO +5V4HZ100 OHM PLATINUM RTDPRSimilar to SCM5B34-03, open input to upscale
SCM5B34-1857
Temp (°F)-55F TO +285FV0V TO +10V10HZ50 OHM @75F TG Ni RTDPR1.9mA Sensor Excitation Current
SCM5B34C-1526
Temp (°C)0C TO +160CV0V TO +5V4HZ10 OHM @25C COPPER RTDPR0.32C accurate
SCM5B34N-1053
Temp (°C)+10C TO +150CV0V TO +5V 4HZ120 OHM NICKEL RTDPR0.17C accurate
SCM5B34N-1115
Temp (°F) -30F TO +200FV0V TO +5V4HZ120 OHM NICKEL RTDPR 
SCM5B34T-1157
Temp (°C)-12C TO +50CV0V TO +5V4HZ5KOHM THERMISTOR PR1.8K OHM TO 30K OHM IN
SCM5B34T-1383
Temp (°C)+10C TO +50CV0V TO +10V4HzTHERMISTOR INPUTQUFenwal 112-202EAJ-B01 Thermister
SCM5B34T-C001
Temp (°C) +150C TO +25CV0V TO +5V4HZTHERMISTOR INPUTPRNon-linearized, NTC Thermistor (93 Ohm @ +150C, 5000 Ohm @ +25C)
* ... Status Codes: PR = Production, PT = Prototypes, QU = Quoted

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We are interested in your feedback regarding our products. Please let us know what you think and if you have any questions regarding the SCM5B34 and how this product could apply to your application. Your feedback is very valuable to us and very much appreciated.