SCM7B47: Isolated Linearized Thermocouple Input Modules. Dataforth

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SCM7B47 modules accept a single channel of input from Type J, K, T, E, R, S, B, or N thermocouples. The signal is filtered, isolated, amplified, linearized, and converted to a high-level analog voltage for output to the process control system.

Linearization is achieved by creating a non-linear transfer function through the module itself; refer to AN505. This non-linear transfer function is configured at the factory and is designed to be equal and opposite to the thermocouple non-linearity.

Cold junction compensation (CJC) is performed using an NTC thermistor (see "Additional SCM7B Part Numbers" section for P/N and AN701 for further information) externally mounted under the field-side terminal block on the backpanel. Open thermocouple detection is upscale using a 30nA current source in the input circuitry.

These modules incorporate a five-pole filtering approach to maximize both time and frequency response by taking advantage of both Thomson (Bessel) and Butterworth characteristics. One pole of the filter is on the field side of the isolation barrier; four are on the process control system side.

After the initial field-side filtering, the input signal is chopped by a proprietary chopper circuit and transferred across the transformer isolation barrier, suppressing transmission of common mode spikes and surges. The signal is then reconstructed and filtered for process control system output.

Modules accept a wide 14 - 35VDC power supply range (+24VDC nominal). Their compact packages (2.13"x1.705"x0.605" max) save space and are ideal for high channel density applications. They are designed for easy DIN rail mounting using any of the "-DIN" backpanels.

Interfaces to Type J, K, T, E, R, S, B and N Thermocouples
Linearizes Thermocouple Signals
Provides High-Level Voltage Outputs
1500Vrms Transformer Isolation
Accuracy, ±0.06% to ±0.16% of Span Typical
ANSI/IEEE C37.90.1 Transient Protection
Input Protected to 120Vrms Continuous
Noise, 1mV Peak (5MHz), 500µV RMS (100kHz)
CMRR, 160dB
NMR, up to 85dB
Easy DIN Rail Mounting
CSA Certified, FM Approved
CE and ATEX Compliant

Isolated Linearized Thermocouple Input Modules

SCM7B47 Devices

Part Number	Thermocouple Type	Output Range	Input Temperature Range	Mechanical Format	Isolation Voltage	Isolation Type	Accuracy
SCM7B47B-10 Order Now	B	+1 to +5 V	800 to 1800 °C	Modular plug-in-board	1500 Vrms	Transformer 2-way	±0.12% (1.20°C) typical, ±0.35% (3.50°C) max
SCM7B47B-10A Order Now	B	0 to +5 V	800 to 1800 °C	Modular plug-in-board	1500 Vrms	Transformer 2-way	±0.12% (1.20°C) typical, ±0.35% (3.50°C) max
SCM7B47B-10D Order Now	B	0 to +10 V	800 to 1800 °C	Modular plug-in-board	1500 Vrms	Transformer 2-way	±0.12% (1.20°C) typical, ±0.35% (3.50°C) max
SCM7B47E-07 Order Now	E	+1 to +5 V	0 to 900 °C	Modular plug-in-board	1500 Vrms	Transformer 2-way	±0.11% (0.99°C) typical, ±0.34% (3.06°C) max
SCM7B47E-07A Order Now	E	0 to +5 V	0 to 900 °C	Modular plug-in-board	1500 Vrms	Transformer 2-way	±0.11% (0.99°C) typical, ±0.34% (3.06°C) max
SCM7B47E-07D Order Now	E	0 to +10 V	0 to 900 °C	Modular plug-in-board	1500 Vrms	Transformer 2-way	±0.11% (0.99°C) typical, ±0.34% (3.06°C) max
SCM7B47J-01 Order Now	J	+1 to +5 V	0 to 760 °C	Modular plug-in-board	1500 Vrms	Transformer 2-way	±0.11% (0.84°C) typical, ±0.32% (3.43°C) max
SCM7B47J-01A Order Now	J	0 to +5 V	0 to 760 °C	Modular plug-in-board	1500 Vrms	Transformer 2-way	±0.11% (0.84°C) typical, ±0.32% (3.43°C) max
SCM7B47J-01D Order Now	J	0 to +10 V	0 to 760 °C	Modular plug-in-board	1500 Vrms	Transformer 2-way	±0.11% (0.84°C) typical, ±0.32% (3.43°C) max
SCM7B47J-02 Order Now	J	+1 to +5 V	-100 to 300 °C	Modular plug-in-board	1500 Vrms	Transformer 2-way	±0.10% (0.40°C) typical, ±0.30% (1.20°C) max
SCM7B47J-02A Order Now	J	0 to +5 V	-100 to 300 °C	Modular plug-in-board	1500 Vrms	Transformer 2-way	±0.10% (0.40°C) typical, ±0.30% (1.20°C) max
SCM7B47J-02D Order Now	J	0 to +10 V	-100 to 300 °C	Modular plug-in-board	1500 Vrms	Transformer 2-way	±0.10% (0.40°C) typical, ±0.30% (1.20°C) max
SCM7B47K-03 Order Now	K	+1 to +5 V	0 to 1300 °C	Modular plug-in-board	1500 Vrms	Transformer 2-way	±0.11% (1.43°C) typical, ±0.32% (4.16°C) max
SCM7B47K-03A Order Now	K	0 to +5 V	0 to 1300 °C	Modular plug-in-board	1500 Vrms	Transformer 2-way	±0.11% (1.43°C) typical, ±0.32% (4.16°C) max
SCM7B47K-03D Order Now	K	0 to +10 V	0 to 1300 °C	Modular plug-in-board	1500 Vrms	Transformer 2-way	±0.11% (1.43°C) typical, ±0.32% (4.16°C) max
SCM7B47K-04 Order Now	K	+1 to +5 V	0 to 600 °C	Modular plug-in-board	1500 Vrms	Transformer 2-way	±0.06% (0.36°C) typical, ±0.18% (1.08°C) max
SCM7B47K-04A Order Now	K	0 to +5 V	0 to 600 °C	Modular plug-in-board	1500 Vrms	Transformer 2-way	±0.06% (0.36°C) typical, ±0.18% (1.08°C) max
SCM7B47K-04D Order Now	K	0 to +10 V	0 to 600 °C	Modular plug-in-board	1500 Vrms	Transformer 2-way	±0.06% (0.36°C) typical, ±0.18% (1.08°C) max
SCM7B47N-11 Order Now	N	+1 to +5 V	200 to 1300 °C	Modular plug-in-board	1500 Vrms	Transformer 2-way	±0.09% (0.99°C) typical, ±0.27% (2.97°C) max
SCM7B47N-11A Order Now	N	0 to +5 V	200 to 1300 °C	Modular plug-in-board	1500 Vrms	Transformer 2-way	±0.09% (0.99°C) typical, ±0.27% (2.97°C) max
SCM7B47N-11D Order Now	N	0 to +10 V	200 to 1300 °C	Modular plug-in-board	1500 Vrms	Transformer 2-way	±0.09% (0.99°C) typical, ±0.27% (2.97°C) max
SCM7B47R-08 Order Now	R	+1 to +5 V	500 to 1750 °C	Modular plug-in-board	1500 Vrms	Transformer 2-way	±0.10% (1.25°C) typical, ±0.30% (3.75°C) max
SCM7B47R-08A Order Now	R	0 to +5 V	500 to 1750 °C	Modular plug-in-board	1500 Vrms	Transformer 2-way	±0.10% (1.25°C) typical, ±0.30% (3.75°C) max
SCM7B47R-08D Order Now	R	0 to +10 V	500 to 1750 °C	Modular plug-in-board	1500 Vrms	Transformer 2-way	±0.10% (1.25°C) typical, ±0.30% (3.75°C) max
SCM7B47S-09 Order Now	S	+1 to +5 V	700 to 1750 °C	Modular plug-in-board	1500 Vrms	Transformer 2-way	±0.08% (0.84°C) typical, ±0.25% (2.63°C) max
SCM7B47S-09A Order Now	S	0 to +5 V	700 to 1750 °C	Modular plug-in-board	1500 Vrms	Transformer 2-way	±0.08% (0.84°C) typical, ±0.25% (2.63°C) max
SCM7B47S-09D Order Now	S	0 to +10 V	700 to 1750 °C	Modular plug-in-board	1500 Vrms	Transformer 2-way	±0.08% (0.84°C) typical, ±0.25% (2.63°C) max
SCM7B47T-05 Order Now	T	+1 to +5 V	0 to 400 °C	Modular plug-in-board	1500 Vrms	Transformer 2-way	±0.13% (0.52°C) typical, ±0.38% (1.52°C) max
SCM7B47T-05A Order Now	T	0 to +5 V	0 to 400 °C	Modular plug-in-board	1500 Vrms	Transformer 2-way	±0.13% (0.52°C) typical, ±0.38% (1.52°C) max
SCM7B47T-05D Order Now	T	0 to +10 V	0 to 400 °C	Modular plug-in-board	1500 Vrms	Transformer 2-way	±0.13% (0.52°C) typical, ±0.38% (1.52°C) max
SCM7B47T-06 Order Now	T	+1 to +5 V	-100 to 200 °C	Modular plug-in-board	1500 Vrms	Transformer 2-way	±0.16% (0.48°C) typical, ±0.47% (1.41°C) max
SCM7B47T-06A Order Now	T	0 to +5 V	-100 to 200 °C	Modular plug-in-board	1500 Vrms	Transformer 2-way	±0.16% (0.48°C) typical, ±0.47% (1.41°C) max
SCM7B47T-06D Order Now	T	0 to +10 V	-100 to 200 °C	Modular plug-in-board	1500 Vrms	Transformer 2-way	±0.16% (0.48°C) typical, ±0.47% (1.41°C) max

Frequently Asked Questions

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

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.

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

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.

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 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.

Is it possible to utilize remote CJC with the 7B47 modules?

SCM7B47 modules are designed to interface the 100k NTC thermistors which are installed on the SCM7B backpanels. Therefore, remote CJC is only possible if the 100k thermistor is replaced with a fixed resistor which requires a custom backpanel.