Campbell-scientific CPEC200 Closed-Path Eddy-Covariance System Manuale Utente Scaricare il pdf (Pagina 46)

CPEC200 Closed-Path Eddy-Covariance System

To initiate a zero/span sequence manually, first turn on the temperature control

for the valves by setting valveTctl_ON = True. The keyboard display’s menu

makes this easy if there is onsite access to the datalogger. Navigate the menus

as follows:

Manual Zero/Span → Temperature Control

The temperature control can also be enabled by setting the public variable

directly (using LoggerNet, for example).

Public variable valve_status gives information on the temperature of the valve

module and scrub module, if used. If temperature control is disabled

(valveTctl_ON = False), valve_status will report Valves are in standby mode

(temperature control is disabled). If temperature control is enabled

(valveTctl_ON = True), valve_status will report Valves are ready if the valve

module and scrub module are within their operating temperatures. Otherwise,

it will report whether the valve module or scrub module temperature is either

too high or too low.

6.3.1.2 Starting the sequence

When the valve module and scrub module, if used, reach their operating

temperature range, and valve_status reports Valves are ready, you may start

the zero/span sequence. If either module is outside of its operating range when

you attempt to initiate the sequence, the sequence will not start, and an error

message will be written to the message_log table and displayed in public

variable latest_note.

To manually start the automatic zero/span sequence, set STARTsequence =

True. This will cause the zero/span sequence to run (see Section 6.2,

Automatic Zero and Span, for details on setting up the sequence). The

keyboard display has a menu to make this easy if there is onsite access to the

datalogger. Navigate the menus as follows:

Manual Zero/Span → Run Zero/Span Seq

The zero/span sequence can also be initiated by simply setting the public

variable STARTsequence directly. At the conclusion of a manually initiated

zero/span sequence, the CPEC200 will automatically resume EC mode. It will

automatically disable temperature control of the valve module and scrub

module.

Running the zero/span sequence manually will write results to the Zero_Span

table, just as if the sequence was run automatically by the system. This record

of the zero/span process is another advantage of using the sequence instead of

full manual control.

6.3.1.3 Stopping the sequence

Normally the zero/span sequence will run to completion, and the CPEC200

will automatically disable valve temperature control and return to EC mode.

To manually stop the sequence while it is running, turn the pump on by setting

pump_ON = True. This will stop the sequence, turn the valves off, disable

valve temperature control, turn the pump on, and return to EC mode.

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Campbell-scientific CPEC200 Closed-Path Eddy-Covariance System Manuale Utente Pagina 46

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