| Measurement output seems incorrect |
Installation location is not representative of actual conditions you
want to measure |
Verify the installation location and relocate the probe if
necessary. |
| Heat conduction along probe head and cable is interfering with
measurement accuracy |
Follow the installation recommendations for cases when temperature
of measured environment differs greatly from ambient. See Installation. |
| Probe is in need of adjustment |
Calibrate and adjust the probe. |
| Probe status indicator LED is red |
Probe is in error state |
Connect the probe to Insight software or an Indigo transmitter and
read the error message(s). See Vaisala Insight software and Error messages. |
| Probe status indicator LED is off even though power is on |
Probe model is HMP1 |
To prevent the warming of the indicator LED from causing a slight
measurement error, HMP1 keeps the indicator normally off (even when power is on). If
the probe is in error state, the red LED is shown. |
| Values of measurement parameters stop changing for a few
minutes |
Probe is performing a sensor heating function such as sensor purge or waiting for
the sensor to cool down |
Wait for the function to complete and measurement parameters to be available
again. |