Keithley MTHERM-20 20-Channel Thermocouple Interface Board for METRABUS System
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Keithley MTHERM-20 20-Channel Thermocouple Interface Board for METRABUS System

Part Number: D7382, 14136

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Stock # 89900-1
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Keithley MTHERM-20 20-Channel Thermocouple Interface Board for METRABUS System

  • Low Noise 12-Bit Integrating A/D Converter
  • Protected to 500 VDC
  • Automatic Cold-Junction Compensation Circuitry


The Keithley MTHERM-20 20-Channel Thermocouple Interface Board for METRABUS System is a thermocouple input board employing 20 differential input channels. Designed specifically for use with the METRABUS Industrial Data Acquisition and Control System, the MTHERM-20 employs a 12-bit integrating A/D converter and 20-channel MUX for reliability, accuracy and low cost. The MTHERM-20/METRABUS system is compatible with a very broad range of personal computers and bus structures including IBM PC/XT/AT and compatibles, and virtually all other large or small computers supporting data I/O via the serial input port (RS-232/422). The seven industry-standard thermocouples are supported directly (DIP-switch-selectable for J, K, T, R, S, B, or E) with data conversion to your choice of degree C or F. In addition, cold-junction compensation can be disabled for direct measurement of millivolts in any of four different full scale input ranges (0 to 76.4mV, 0 to 25mV, 0 to 15mV, or 0 to 5mV).

The MTHERM-20 is fully isolated to 500 VDC with greater than 72 dB Common Mode Rejection (35 dB NMR). Measurement resolution is 0.1 to 0.8°C (range dependent) with a measurement accuracy of 0.5°C. Signal input filtering can be implemented using a four sample-time constant (switch-selectable). Required power is +5 VDC @ 500 mA (typ) via the METRABUS cable or via an external power supply. Removable screw terminals will accept 14 AWG or smaller thermocouple wire. The MTHERM-20 interfaces to the METRABUS via a 50 conductor ribbon cable carrying data, power, and control signals to and from the board. Ground lines are interleaved with data lines to assure accurate, noise-free measurements even at lengths of 100 feet (max) from the computer. This allows MTHERM-20 positioning adjacent to its point of use for easy signal connections. The MTHERM-20 can be mounted in standard NEMA type enclosures or in Keithley's own RMT-type enclosure.

Product Family: MTHERM-20

Important Notice: Please note that any additional items included with this equipment such as accessories, manuals, cables, calibration data, software, etc. are specifically listed in the above stock item description and/or displayed in the photos of the equipment. Please contact one of our Customer Support Specialists if you have any questions about what is included with this equipment or if you require any additional information.

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Keithley MTHERM-20 20-Channel Thermocouple Interface Board for METRABUS SystemKeithley MTHERM-20 20-Channel Thermocouple Interface Board for METRABUS System

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Manuals, Datasheets, Drivers, Links

Keithley MTHERM-20 Datasheet (pdf) 
Link to Keithley Website 

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