Sensor Head - Warm Up

Sensor Warm Up Prior to operation the sensor must be warmed up to burn off any contaminants.

When the monitor is first switched on it will warm up for 3 minutes. The reading will then flash for the next 7 minutes to indicate that the sensor is still in the warm up phase. It is recommended that the monitor is kept in Stand By mode when not being used to keep the sensor heated and prevent the build-up of contaminants.

If the sensor is new (or unused for long periods) it can take up to 24 hours for the message “sensor warming up” (or “sensor failure” in older models) to disappear.

Should the message remain after this time, a genuine sensor failure may have occurred. See the trouble-shooting guide.

For Ozone Sensor Heads:

  • 24 hours is a conservative time for an ozone sensor to burn off contaminants and achieve its stated performance specification. In most instances this will be achieved well within 24hrs.
  • The warm up period can be reduced by subjecting the sensor to elevated ozone levels for a short period. For example, 0.1 ppm of ozone for 5 minutes typically reduces the warm up time to ​<30 min.


Note: Do not remove the sensor head while the monitor is switched on. This may damage the unit. If the sensor head is removed under these conditions without AC/DC adapter connected, the unit will automatically shut down.

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