Section 8. Troubleshooting
Value Description Threshold
1 Flow out of range Average flow for a 30-minute period is <125 sccm or
>330 sccm
2 Reserved Not applicable
4 Reserved Not applicable
8 Low RH sensor voltage Sensor voltage ≤1.6 V for >50% of time for a 30-
minute period
16 Cell temperature out of
range
>65 °C or <-50 °C for >5% of time for a 30-minute
period
32 Reserved Not applicable
64 No sonic Set if sonic anemometer is not detected
128 Poor sonic signal Set if poor sonic signals persist for >10% of time for
a 30-minute period
256 Rain detected True for >50% of time for a 30-minute period
512 High humidity
shutdown
>90% cell RH >2 data points or
>90% ambient RH for 100 data points and 50% of
the last 100 sonic rain flag data points
1024 Cold temperature
shutdown
Cell temperature <0 °C for 100 data points
2048 High cell pressure
relative to ambient
Average cell pressure - average ambient pressure is
> 0.4 kPa for a 30-minute period
4096 Low cell pressure
relative to ambient
Average cell pressure - average ambient Pressure is
< -1.5 kPa for a 30-minute period
8192 Reserved Not applicable
16384 Low pump voltage Pump voltage <8 V for >50% of time for a 30-minute
period
32768 High pump voltage Pump voltage >20 V for >50% of time for a 30-
minute period
Table 8-1. A diagnostic code is included with each measurement. Some diagnostic
codes are simply for your information, others indicate the quality of data, and others
are used to identify issues that should be fixed.
Addressing diagnostic codes
Some diagnostic codes are simply for your information - there is nothing to do
besides know what the code indicates. For example, if the LI-710 measures freezing
temperatures or persistent high humidity, it stop measurements. You can assume
that evapotranspiration is near zero in these conditions. The instrument will resume
8-2 LI-710 Evapotranspiration Sensor Instruction Manual
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