DSCT37B-07

Thermocouple Input Transmitter

DSCT37B-07
Thermocouple Input Transmitter

Description

Each DSCT37 non-linearized thermocouple input transmitter provides a single channel of thermocouple input which is filtered, isolated, amplified, and converted to a process current output. Signal filtering is accomplished with a five-pole filter, which provides 85dB of normal-mode rejection at 60Hz and 80dB at 50Hz. An anti-aliasing pole is located on the field side of the isolation barrier, and the other four are on the process loop 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 DSCT37 can interface to eight industry standard thermocouple types: J, K, T, E, R, S, B and N. Each transmitter is cold-junction compensated to correct for parasitic thermocouples formed by the thermocouple wire and screw terminals on the transmitter. Upscale open thermocouple detection is provided by circuitry. Downscale indication can be implemented by installing a 47 MOhm, ±20% resistor between screw terminals 6 (+IN) and 8 (-EXC) on the input terminal block.

Special input and output circuits on the DSCT37 transmitters provide protection against accidental connection of power-line voltages up to 240VAC and against transient events as defined by ANSI/IEEE C37.90.1. Loop power lines are secured to the module using screw terminals, which are in pluggable terminal blocks for ease of system assembly and reconfiguration. Transmitter zero and span settings are adjustable up to ±10%. The adjustments are made using potentiometers located under the front panel label and are non-interactive for ease of use.

Specifications

  • Thermocouple Type B
  • Output Range 4 to 20 mA
  • Input Temperature Range 0 to 1800 °C
  • Mechanical Format DIN rail
  • Isolation Voltage 1500 Vrms
  • Isolation Type Transformer
  • Accuracy ±0.05% (0.90°C) max
  • Supply Voltage 10.8V to 60V
  • Input Voltage Withstand 240Vrms
  • Gain/Offset Adjust ±10% Zero and Span
  • Module Bandwidth 3 Hz
  • NMR (60 Hz) Rejection 85 dB at 60 Hz, 80 dB at 50 Hz
  • External I-to-V Resistor N/A
  • Output Control Always enabled
  • Output Resistance
  • Dimensions 2.95 x 0.89 x 4.13 inches
  • Interface 8 Pos terminal block
  • Customization YES
  • Weight 138 grams (4.87 ounces)

Features

  • Interfaces to Types J, K, T, E, R, S, B, and N Thermocouples
  • Process Current Output
  • 1500Vrms Transformer Isolation
  • ANSI/IEEE C37.90.1 Transient Protection
  • Input and Output Protected to 240VAC Continuous
  • Up to 60V Loop Voltage
  • 160dB CMR
  • 85dB NMR at 60Hz, 80dB at 50Hz
  • ±0.05% Accuracy
  • ±0.01% Linearity
  • Easily Mounts on Standard DIN Rail
  • CSA and FM Approvals Pending
  • CE Compliant

Block Diagram

DSCT37 block diagram

Accessories

DSCX-BLANK
Blank Empty DIN Rail Case for Holding Positiion. DSCA or DSCT View
SCMXRAIL1-1.0
DIN EN 50022-35 x 7.5 (slotted steel), 1 meter length View
SCMXRAIL1-2.0
DIN EN 50022-35 x 7.5 (slotted steel), 2 meter length View
SCMXRAIL2-01
DIN EN 50035-G32 (slotted steel), 1 meter length View
SCMXRAIL2-02
DIN EN 50035-G32 (slotted steel), 2 meter length View
SCMXRAIL3-01
DIN EN 50022-35 x 15 (slotted steel), 1 meter length View
SCMXRAIL3-02
DIN EN 50022-35 x 15 (slotted steel), 2 meter length View

Competitive Cross-Reference

  • No cross reference is available.
View Dataforth cross-reference data.
The information available through this competitive cross reference guide are based upon product catalog information obtained from a variety of sources. The competitive cross reference information is being provided to you free of charge for your use. While Dataforth Corp has used reasonable efforts to ensure data accuracy, Dataforth Corp does not guarantee that it is error-free, nor does Dataforth Corp make any other representation, warranty or guarantee that the information is accurate, correct, reliable or up-to-date. Dataforth Corp expressly disclaims all implied warranties regarding this information, including but not limited to any implied warranties of merchantability or fitness for a particular purpose.

This information is provided only as a convenience on an "as is" basis and Dataforth Corp. or its representatives or distributors are not responsible for any incorrect, inaccurate, or incomplete information. You are solely responsible for (1) selecting the appropriate Dataforth products for your application, (2) designing, validating and testing your application, and (3) ensuring your application meets applicable standards, and any other safety, security, or other requirements.

FAQ

Due to resource constraints on my computer, I'm unable to open the three dimensional CAD models provided on your website. Does Dataforth provide two demensional CAD models for download as well?
Two dimensional CAD models can be generated upon customer request. Please contact Customer Service for assistance.
If a thermocouple is soldered to a lead that has current running through it, how do you avoid affecting the thermocouple signal and subsequent measurement?
The thermocouples must be isolated so current does not come from the circuit under test and run through them. SCM5B, SCM7B, 8B, DSCA, DSCT, MAQ20 all offer the required isolation.
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.
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

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