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DSCT37

Isolated DIN Rail Non-Linearized Thermocouple Input Transmitters

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 85 dB of normal-mode rejection at 60 Hz and 80 dB at 50 Hz.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 MΩ, ± 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 240 VAC 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.

Circuit diagram Dataforth DSCT37

Block Diagram DSCT37



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8 Modules for Type DSCT37:

ModuleInputDescription
DSCT37T-03 Type T / -100°C to +400°C DSCT37 Isolated DIN Rail Non-Linearized Thermocouple Input Transmitters
DSCT37R-05 Type R / 0°C to 1750°C DSCT37 Isolated DIN Rail Non-Linearized Thermocouple Input Transmitters
DSCT37S-06 Type S / 0°C to +1750°C DSCT37 Isolated DIN Rail Non-Linearized Thermocouple Input Transmitters
DSCT37K-02 Type K / -100°C to +1350°C DSCT37 Isolated DIN Rail Non-Linearized Thermocouple Input Transmitters
DSCT37N-08 Type N / -100°C to +1300°C DSCT37 Isolated DIN Rail Non-Linearized Thermocouple Input Transmitters
DSCT37J-01 Type J / -100°C to +760°C DSCT37 Isolated DIN Rail Non-Linearized Thermocouple Input Transmitters
DSCT37E-04 Type E / 0°C to +900°C DSCT37 Isolated DIN Rail Non-Linearized Thermocouple Input Transmitters
DSCT37B-07 Type B / 0°C to +1800°C DSCT37 Isolated DIN Rail Non-Linearized Thermocouple Input Transmitters

Specifications

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  • Input: Thermocouple Typ J, K, T, E, R, S, B and N
  • Output: 4-20 mA
  • Bandwidth 3 Hz
  • Isolation 1500 Vrms
  • In- and Output protection 240 Vrms
  • Input Resistance 50 MOhm
  • Accuracy ± 0.05%
  • Linearity ± 0.01%
  • ANSI/IEEE C37.90.1 Input protection
  • CMR 160dB
  • True 3-way isolation
  • NMR: 85/80dB at 60/50Hz
  • Adjustability of +/-10 % Zero and span
  • Operating Temperature Range -40°C … +80°C
  • 5-pol. Filtering
  • Dimensions 75 x 22.5 x 105 mm
  • DIN Rail Mounting
  • CE Compliant
  • Loop Supply Voltage 10.8 to 60 V
  • Special Solutions on request