Vaisala HMP4 - Troubleshooting; Problem Situations; Error Messages; Table 5 Troubleshooting Table

8. Troubleshooting
8.1 Problem situations
Table 5 Troubleshooting table
Problem Possible cause Solution
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 diers greatly
from ambient. See Installation
(page 20).
Probe is in need of adjustment Calibrate and adjust the probe.
See Calibration and adjustment
(page 52).
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 (page 41) and Error
messages (page 61).
Probe status indicator LED is
o 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 o
(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
chemical purge or waiting for
the sensor to cool down
Wait for the function to
complete and measurement
parameters to be available
again
8.2 Error messages
Probes can communicate with error messages when they are connected to an Indigo
transmitter or Insight software. The messages are categorized according to the severity of the
status:
Chapter 8 – Troubleshooting
61