Vaisala HMP110REF - User Manual

Questions and Answers

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yandersonSep 9, 2025
Why is the humidity measurement wrong on my Vaisala Measuring Instruments?
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  williamsdanielSep 9, 2025
  If the humidity measurement seems incorrect on your Vaisala Measuring Instruments, take these steps: * Check for condensation on the probe and sensor. * Use the L command to check the currently applied calibration correction. * For HMP110, calibrate and adjust the probe. For HMP60, calibrate the probe and change the sensor if needed. * Ensure the temperature sensor legs aren't short-circuited. If the temperature sensor is damaged, contact Vaisala. Additionally, if the humidity sensor is wet, wait for it to dry, or carefully dry the sensors and filter with clean instrument air after removing the filter. If the humidity sensor is damaged or missing, replace it or contact Vaisala. Also, if the ambient temperature is too high, lower the temperature at the installation site.
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Denise CampbellSep 12, 2025
How to fix 'T meas error' or 'RH meas error' on Vaisala HMP110REF Measuring Instruments?
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  Austin RangelSep 12, 2025
  If the measurement is not working and you see 'T meas error' or 'RH meas error' on your Vaisala Measuring Instruments, open the filter and check if the sensors are damaged or missing. Also, check the supply voltage and the output mode of the probe using a serial line.
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Steven RogersSep 13, 2025
What causes a voltage error on Vaisala HMP110REF Measuring Instruments and how to fix it?
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  michaelsingletonSep 13, 2025
  If you see a 'Voltage error' on your Vaisala Measuring Instruments, it means the operating voltage is out of range. Correct the voltage and reset the probe.
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sara82Sep 15, 2025
What to do if a check sum error is active on Vaisala HMP110REF Measuring Instruments?
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  Meghan CrawfordSep 15, 2025
  If you encounter any check sum error (e.g., Program flash check sum error, Parameter flash check sum error) on your Vaisala Measuring Instruments, restore the probe to factory settings using the FRESTORE command and check again. If the error persists, contact Vaisala.
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davidmcgeeSep 17, 2025
What does 'Frequency measurement outside the permissible value range' mean for Vaisala Measuring Instruments?
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  bradley24Sep 18, 2025
  If you are getting a 'Frequency measurement outside the permissible value range' error on your Vaisala Measuring Instruments, check for condensation on the probe and sensor and allow the probe and sensor to dry. If the error persists, there may be a problem with the electronics. Contact Vaisala.

Vaisala HMP110REF Specifications

General

Measurement Parameters	Relative Humidity, Temperature
Humidity Measurement Range	0 to 100 %RH
Temperature Measurement Range	-40 to +80 °C
Operating Temperature Range	-40 to +80 °C
Storage Temperature Range	-40 to +80 °C
Protection Class	IP65
Humidity Accuracy	±1.5 %RH (0...90 %RH)
Temperature Accuracy	±0.2 °C at 20 °C
Response Time	15 seconds (63% step change)
Cable Length	2 m
Output Signal	Voltage 0 ... 1 V
Supply Voltage	5 ... 28 VDC
Material	PC