Campbell Scientific AP200 CO2/H2O Atmospheric Profile System - Manual (Page 73)

Appendix B. AP200 Diagnostics
Bit 2: Valve temperature is outside its operating range
Bit 2 of diag_AP200 indicates the valve temperature is outside its operating
range. This triggers the AP200 to shut down the valves and pump to protect
the valves from possible damage.
To confirm the problem, verify that public variable valve_tmpr_OK = False.
This variable is set to True if the valve temperature is within its operating
range and is set to False if it is outside this range.
For diagnosing a problem using data saved in the output tables ( IntAvg,
CalAvg, or SiteAvg), the variable valve_tmpr_OK is not available. Instead,
check the value of ValveTmprOK_Avg. This is a floating point number that
represents the fraction of time (from 0 to 1) that valve_tmpr_OK is true
during the averaging period. A value of 1 indicates no valve temperature
problem at any time during the averaging period. A value of 0 indicates a
valve temperature problem during the entire time.
Also check the measured valve temperature, valve_tmpr, and compare it to the
operating range (4°C to 49°C). The valve module has a heater that turns on if
valve_tmpr falls below 5°C. If the valve temperature is too low, check the
operation of the heater which is controlled by public variable valve_heat_ON.
This variable is saved in RawData only if saving all diagnostics. Its
corresponding variable valve_heat_Avg is saved in the averaged output tables
( IntAvg, CalAvg, and SiteAvg).
The valve module has a fan that turns on if valve_tmpr rises above 45°C. The
fan will stay on until the valve temperature falls below 43°C. If the valve
temperature is too high, check the operation of the fan which is controlled by
public variable valve_fan_ON. This variable is saved in RawData only if
saving all diagnostics. Its corresponding variable valve_fan_Avg is saved in
the averaged output tables ( IntAvg, CalAvg, and SiteAvg).
If the fan is on and the valve temperature is too high, check the ambient
temperature. The AP200 is rated for ambient temperatures from –30°C to
45°C.
Bit 3: Pump temperature is outside its operating range
Bit 3 of diag_AP200 indicates the pump temperature is outside its operating
range. This triggers the AP200 to shut down the pump and valves to protect
the pump from possible damage.
To confirm the problem, verify that public variable pump_tmpr_OK = False.
This variable is set to True if the pump temperature is within its operating
range and is set to False if it is outside this range.
For diagnosing a problem using data saved in the output tables ( IntAvg,
CalAvg, or SiteAvg), the variable pump_tmpr_OK is not available. Instead,
check the value of PumpTmprOK_Avg. This is a floating point number that
represents the fraction of time (from 0 to 1) that pump_tmpr_OK is true
during the averaging period. A value of 1 indicates no pump temperature
problem at any time during the averaging period. A value of 0 indicates a
pump temperature problem during the entire time.
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