Isolation resistance monitoring in temperature sensors

Increased process safety with SmartSense diagnostic functions


Vibration, rapid temperature changes and prolonged operation at the temperature limits cause temperature sensor degradation in the long run, affecting measurement stability and process safety. If humidity enters the mineral isolated measuring insert, the isolation resistance decreases, leading to a failed temperature measurement. This in turn can trigger an increase in process temperature with dangerous side-effects. 


OPTITEMP temperature transmitters with SmartSense functionality monitor isolation resistance in RTD sensors or thermocouples continuously. This allows detection of potential sensor failure before process reliability is impaired. Operators can plan sensor maintenance early on to prevent inefficient operation and dangers to plant safety.

Safety benefits

  • Advanced temperature transmitter diagnostics to monitor isolation resistance in  temperature sensors   

  • Increased process safety by way of SmartSense functionality: Prevention of production losses and unplanned downtimes due to sensor failure

  • Early warning of isolation errors and sensor degradation: SmartSense triggers an alarm if the isolation resistance falls below a minimum threshold

  • Enables predictive maintenance of temperature sensors to prevent a future sensor break down ahead of time

  • Reliable detection of moisture in the isolation of RTD and TC sensors

  • SmartSense functionality available for various OPTITEMP in-head and rail-mounted temperature transmitters

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SmartSense insulation monotoring
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2 products


Rail-mounted temperature transmitter with universal dual input, galvanic isolation, HART® and SIL

Product discontinued


Rail-mounted temperature transmitter with universal inputs and high galvanic isolation