Campbell Scientific CVS4200 / BVS4300 Stationary Samplers - Manual (Page 53)

CVS4200 / BVS4300 Stationary Samplers
Summary of Sequence:
SET, START DELAY, ARROW(S), ENTER, ##, ENTER, RESTART,
RESTART.
7.6.5 Programming SAMPLE INITIATION
7.6.5.1 SAMPLE INITIATION Overview
SAMPLE INITIATION is the function that will determine the frequency that
samples are drawn. A variety of options to enhance the capabilities of this
function are available on the Touchpad. When the SAMPLE INITIATION
has been chosen to be set, a list of options is presented as flashing text below
the main heading of the function selected. The list is advanced using the
ARROW keys (any direction) until the desired option is displayed. These
options are programmable from the Touchpad and require only that the sampler
have the correct equipment configuration to utilize them. The last option
selected in previous programming will be the first to appear on the display.
The display showing disabled will reflect
the fact that the function is not being used.
Sampler operation can be started at uniform
intervals. This option allows an interval time
to be set between sample cycles.
This option will allow the controller to
determine the SAMPLE INITIATION
based on external pulses. Pulses fed to an
internal accumulator in the controller will be
compared to the setting entered by the
operator and will cause a sample cycle to
start. The accumulator will reset
immediately and counting of pulses will
begin again. There is no loss of count during
the sample cycle.
Where external devices do not themselves
generate pulses in any relation to their
process but generate a current signal of 4-
20mA, this input option will generate
internal pulses proportional to the incoming
4-20mA signal. These can then be treated
the same as the Pulse Input option and
accumulated in the controller to determine
when a sample cycle should occur.
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