RTM-1 Reference temperature monitor


The RTM-1 digital reference thermometer is a desktop device for indicating temperature with a very high level of precision and stability. Both resistance-temperature conversion (for RTD) and voltage-temperature conversion (for TC).

The RTM-1 digital reference thermometer is a desktop device designed and manufactured by Gometrics for indicating temperature with a very high level of precision and an extremely high long term stability, giving it a level of reliability only found in sophisticated laboratory instruments.

The measuring circuit of the RTM–1 reference thermometer self-calibrates against an internal resistance standard, ensuring the stability needed for reliable measurements.

The keyboard of the RTM-1 reference thermometer allows the deviation function coefficients to be entered which, when read directly in ºC achieves a precision of 0,01 ºC in any value of the calibrated range between –200 and +200 ºC and 0,02 ºC between +200 ºC and +660 ºC, stable for one year.

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  • 2 x 20-digit backlit LCD display
  • Response time of 2 readings/sec
  • Input impedance of >10 MOhm (mV, T/C), 1 MOhm V and 5 Ohm (mA)


  • Accepts RTD type resistance thermometers and thermocouples.
  • Incorporates a 16-bit microprocessor and a 24-bit A/D converter with 24-bit resolution.
  • Accepts direct mV, V, mA and Ohm readings


  • Calibration of RTM1 by means of standard resistor.
  • Calibration of PT-100 thermoresistance and calculation of ITS-90 deviation coefficients.
  • Input of ITS-90 coefficients by keyboard

Technical specifications

Display 2 x 20 digits LCD 5,5 mm high, backlighted
Responding time 2 readings/sec
Input impedance > 10 MOhm (mV, T/C), 1 MOhm V and 5 Ohm (mA)
Power supply 230 Vca ± 10%, 50/60 Hz (optional 110 Vca)
Weight 1,5 Kg
Dimensions 200 x 223 x 90 mm
Storage temperature -10ºC to 60ºC
Operating time 0ºC to 50ºC
Room humidity 0% to 80% HR without condensation
Temperature coefficient ± 0.0005% RDG/ºC (only resistance measurement)
Temperature coefficient ± 0,001% RDG/ºC

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