Campbell Scientific CPEC200 Closed-Path Eddy-Covariance System - Manual (Page 59)

Appendix A. CPEC200 Diagnostics
notes on bit 8 and on irga_status, which may give additional information
about the IRGA problem.
pump_flow_OK
Boolean variable pump_flow_OK = True if the pump flow (pump_flow) is
within 10% of the setpoint PUMP_SETPT. It is set to False if it is outside
this range.
The PUMP_SETPT check is performed continuously and pump_flow_OK is
set accordingly. If the CPEC200 is in EC mode and pump_flow_OK is false,
bit 6 of diag_cpec will be set to indicate there is a problem with the pump
flow. If the CPEC200 is not in EC mode, pump_flow_OK is ignored. See
notes on bit 6.
pump_tmpr_OK
Boolean variable pump_tmpr_OK = True if the pump is within its range (0°C
to 55°C) and is set to False if it is outside this range.
This check is performed continuously, and pump_tmpr_OK is set
accordingly. If the CPEC200 is in EC mode, bit 5 of diag_cpec will be set if
pump_tmpr_OK = False to indicate there is a problem with the pump
temperature. If the CPEC200 is not in EC mode, pump_tmpr_OK is ignored.
See notes on bit 5.
buff_depth_OK
Boolean variable buff_depth_OK is equivalent to bit 4 of diag_cpec. If the
datalogger processing falls too far behind, buff_depth_OK =False and bit 4 of
diag_cpec will be set. See notes on bit 4.
valve_flow_OK
Boolean variable valve_flow_OK is defined only if the CPEC program is
configured to use a valve module. See Section, 4.2.3, Valve Module, for
details.
If the valve (zero/span) flow ( valve_flow) is within its normal range,
valve_flow_OK = True but = False if it is outside this range. This check is
performed only if a valve is selected ( valve_number > 0).
The variable valve_flow_OK is ignored in EC mode, but if the CPEC200 is
not in EC mode, bit 3 of diag_cpec will be set if valve_flow_OK = False to
indicate there is a problem with the valve flow. See notes on bit 3.
valve_tmpr_OK
Boolean variable valve_tmpr_OK is defined only if the CPEC program is
configured to use a valve module. See Section 4.2.3, Valve Module, for details.
If the valve module temperature valve_tmpr is within its operating range (0°C
to 60°C), valve_tmpr_OK = True but will = False if it is outside this range.
This check is performed continuously, and Boolean variable valve_tmprOK is
set accordingly.
The variable valve_tmpr_OK is ignored in EC mode, but if the CPEC200 is
not in EC mode, bit 2 of diag_cpec will be set if valve_tmpr_OK= False,
indicating there is a problem with the temperature of the valve module. See
notes on bit 2.
A-7