Campbell Scientific CVS4200 / BVS4300 Stationary Samplers - Manual (Page 70)

CVS4200 / BVS4300 Stationary Samplers
7.6.7 Programming OTHER OPTIONS
7.6.7.1 OTHER OPTIONS Overview
SET or VIEW
This feature allows the user to SET or
VIEW the internal Real-Time clock of the
microprocessor.
This feature allows the user to SET or
VIEW the duration for which the sampler
will purge the intake line prior to drawing in
a sample to the chamber. The maximum
allowable setting is 99 seconds.
This feature allows the user to change how
the Pinch Valve will operate during
sampling cycles. The setting is dependant
upon which generation of sample the
controller is used on. If this is a new unit, the
Pinch Valve action will have been factory
set. Should the controller be used as a
retrofit into an older model, the setting may
have to be changed. If the sampler has a
Pinch Valve that squeezes shut the discharg
tube even during an inactive state, this
model is termed as normally closed. Shou
the tubing be shut only when the Pinch
Valve is energized, it is termed normally
open. This is the ONLY setting for the
e
ld
PVS samplers.
This feature will enable or disable the ability
of the controller to cease operations wh
encounters repeated difficulties in the
drawing of samples. The controller norm
will attempt to obtain a valid sample by
repetition of its programming with extend
purge times and vacuum cycles, als
extending the time allowed for the
acquisition of the sample. When a sam
not obtained, this fact is noted in the
controller memory and the program resum
If after two (2) successive attempts have
failed, the controller will Shut Down, haltin
sampling until operator intervention clears
any reason for fault and RESTARTs th
program. This is not always a required
course of action. If FAULT SHUTDOWN is
disabled, the program will record all failures
to obtain samples a
en it
ally
ed
o
ple is
es.
g
e
nd will wait until the next
sample initiation.
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