Signal Conditioning
Data Acquisition & Control
4-20mA Transmitters
IoT Power & Energy Monitoring
Data Communications
Power Supplies
Software
SCM7B34/34N
Isolated Linearized 2- Or 3-Wire RTD Input Modules
Each SCM7B34/34N RTD input module accepts a single channel of 100 ohm Platinum (a = 0.00385) or 120 ohm Nickel (a = 0.00672) RTD input and produces an input voltage in response to a low-level current excitation. The input signal is filtered, isolated, amplified, linearized, and converted to a high-level analog voltage for output to the process control system.
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.
In response to the low-level current excitation signal, the RTD 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.
Linearization is achieved by creating a non-linear transfer function through the module itself. This non-linear transfer function is configured at the factory and is designed to be equal and opposite to the specific RTD non-linearity. Lead compensation is achieved by matching two current paths thus cancelling the effects of lead resistance.
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.
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.
In response to the low-level current excitation signal, the RTD 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.
Linearization is achieved by creating a non-linear transfer function through the module itself. This non-linear transfer function is configured at the factory and is designed to be equal and opposite to the specific RTD non-linearity. Lead compensation is achieved by matching two current paths thus cancelling the effects of lead resistance.
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.
Certifications
Documents
3D CAD Models
Product Availability
Usually stock to 3-5 weeks. Contact Customer Service for current lead times.
Dimensions & Accessories
Features
- Interfaces to 100 Ohm Platinum or 120 Ohm Nickel RTDS
- Provides 250µA RTD Excitation Current
- Linearizes RTD Signal Response
- Provides High-Level Voltage Outputs
- 1500Vrms Transformer Isolation
- Accuracy, ±0.05% to ±0.15% of Span Typical
- Nonconformity, ±0.025% to ±0.07% of Span Typical
- ANSI/IEEE C37.90.1 Transient Protection
- Input Protected to 120Vrms Continuous
- Noise, 500µV Peak (5MHz), 250µV RMS (100kHz)
- CMRR, up to 160dB
- NMR, up to 85dB
- Easy DIN Rail Mounting
- CSA Certified, FM Approved
- CE and ATEX Compliant
Block Diagram
Ordering
NOTE: Data in below table can be filtered. Please use the
to make your selection. If you have any questions about the displayed data,
please contact Customer Service at +1 520-741-1404 or sales@dataforth.com
Custom Modules
Below is a list of existing custom modules. If you don't see a module matching your target specifications, contact Customer Service and Application Support to discuss design guidelines and
design feasibility. Customer Service and Application Support can be reached at
sales@dataforth.com or +1-800-444-7644.
NOTE: Data in below table can be filtered. Please use the
to make your selection. If you have any questions about the displayed data,
please contact Customer Service at +1 520-741-1404 or sales@dataforth.com
* ... Status Codes: PR = Production, PT = Prototypes, QU = Quoted
FAQ
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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 SCM5B32 and how this product could apply to your application. Your feedback is very valuable to us and very much appreciated.
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