The HMS1655 includes two dedicated thermistor inputs to measure and monitor resistive temperature sensors or thermistors. You can configure these inputs for use with negative temperature coefficient (NTC) Type 2 or Type 3 thermistors from BAPI or other manufacturers. BAPI manufactures several combination temperature and humidity sensor products which are ideal for use with the HMS-1655 for complete room monitoring and control applications. Use BAPI part no. BA/10K-2-H200-R, a combination temperature and humidity sensor that includes a NTC Type 2 thermistor to sense temperature and a ±2% humidity transmitter with a 0 V to 10 V output.
To set up the thermistor inputs:
- On the second page of the Analog Inputs Setup menu, tap Thermistor Input 1 or Thermistor Input 2 to open the Thermistor x Settings configuration screen. From this configuration popup, you can specify which type of NTC thermistor device is connected and the engineering units display the monitored temperature on the main screen.
- If the thermistor input is used as part of a temperature control scheme, tap Next at the Thermistor x Settings popup to open the setpoint entry configuration screenwhere you can enter a target temperature setpoint. Map the thermistor input to one of the analog outputs configured for PID control mode.
- To display the monitored temperature on the main screen, set the temperature display source to use the corresponding thermistor input. To configure this, tap Display Setup > Display Options. See Display setup for more information.