Campbell-scientific CPEC200 Closed-Path Eddy-Covariance System Bedienungsanleitung PDF herunterladen (Seite 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

and H

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

and H

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

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