Campbell Scientific PVS4100/4120/4150 Portable Automatic Samplers - Manual (Page 48)

Section 5. Programming
5-8
5.2.4 Setting Program Parameters Individually
To modify any of the settings individually
press the “SET” button followed by the
appropriate button based on what parameter
is being changed.
5.3 Programming START DELAY
5.3.1 START DELAY Overview
START DELAY is the function which will delay the beginning of a sample
program until certain external conditions are met. Upon meeting those
conditions, the sampler will initiate a sample cycle and then operate based on
the SAMPLE INITIATION parameters. Under START DELAY, flashing
text prompts the user to scroll through available options by pressing arrow
keys. These options only require that the correct equipment is present 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.
The basis for several timed functions is the
Real Time Operating System. Time (of) Day
will be a means of setting the timing period
for the START DELAY function. The
format is on a weekly basis, requiring hour,
minute, AM/PM and day inputs (HH:MM
AM SUN). This means the start of a sampler
program can be delayed up to seven days.
This option will allow the controller to
determine the sampler’s start of operation
based on external pulses. Pulses fed to an
internal accumulator in the controller will be
compared to the setting entered by the
operator. Pulse requirements of the system
are detailed in the specifications.
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 program should start.