Campbell Scientific CPEC200 Closed-Path Eddy-Covariance System - Manual (Page 54)

Appendix A. CPEC200 Diagnostics
If the CPEC200 program is configured for valve operation there are more
possibilities:
• Normal EC mode: Pump is on
• Manual Zero/Span mode: Pump is off
• Starting Zero/Span sequence: This message persists normally for only
one scan indicating the zero/span sequence has been triggered, either
automatically or manually, but has not yet begun.
• If the zero/span sequence is active, mode_status describes the current
step in the sequence as shown in TABLE 6-1, found in Section 6.2,
Automatic Zero and Span.
cpec_status
Public variable cpec_status gives an overall status for the entire system. If
there are no problems detected, cpec_status will report CPEC is OK. This is
equivalent to diagnostic word diag_cpec = 0. In most cases where a problem
is detected, cpec_status refers the user to a lower-level (subsystem) status
variable such as irga_status, sonic_status, pump_status, or valve_status
which are described in the sections below.
• CPEC is OK means there are no relevant errors detected. This is
equivalent to diag_cpec = 0 (no bits set)
• ERROR: Battery voltage is in deadband or ERROR: Battery voltage is
too low means there is a problem with the supply voltage. This is
equivalent to BattVolt_OK = False and diag_cpec bit 9. See the
notes for bit 9.
• ERROR: IRGA problem is equivalent to diag_cpec bit 8. See notes
on irga_status.
• ERROR: Sonic problem is equivalent to diag_cpec bit 7. See notes on
sonic_status.
• ERROR: Pump flow problem is equivalent to diag_cpec bit 6. See
notes on pump_status.
• ERROR: Pump temperature problem is equivalent to diag_cpec bit 5.
See notes on pump_status.
• WARNING: Buffer depth too large is equivalent to diag_cpec bit 4.
See the notes on bit 4, buff_depth_OK.
• ERROR: Valve flow problem is equivalent to diag_cpec bit 3. See
notes on valve_status.
• ERROR: Valve temperature problem is equivalent to diag_cpec bit 2.
See notes on valve_status.
• ERROR: Scrub module temperature problem is equivalent to
diag_cpec bit 1. See notes on valve_status.
irga_status
Public variable irga_status gives the status of the EC155 and is based on the
diagnostic word from the EC155 ( diag_irga) as well as the CO
2
and H
2
O
signal levels, which do not trigger a diagnostic bit in the EC155.
• IRGA is OK is displayed if bit one of diag_irga is zero and the CO
2
and H
2
O signals are both greater than 0.8. This means the EC155 has
detected no problems and the EC155 windows are clean.
• ERROR: No data from IRGA - Check EC100 power and
communication is displayed if diag_irga = NAN. This indicates the
EC100 does not respond to the datalogger’s request for data, usually
A-2