Campbell Scientific PVS4100/4120/4150 Portable Automatic Samplers - Manual (Page 49)

Section 5. Programming
5-9
The sampler controller can react to an
external dry contact, otherwise known as a
zero-voltage contact, to activate a sample
program on demand. This will generally be
when external conditions have caused a
relay to close, requiring a sample program
be started at that time.
This option is a special case of the external
contact option. The key difference is that
the contact closure must be present for a
pre-programmed time, thus enabling
verification of the signal. This will
accommodate fluctuations as seen in a level
switch, thereby avoiding triggering of
samples at unwanted times. This is the only
case in which the START DELAY is not a
single timed event. Should the contact open
for the same pre-programmed time, the
sampler will (after completing any sample
cycle already in progress), halt the sampling
initiation and await the next verified signal.
At this time, the sampling program will
resume.
5.3.2 START DELAY using Time/Day
The following sequence of entries are made
on the Touchpad to create a future starting
time for the operation of the Sampler. The
ACTIVE SETTINGS are not being altered.
1. Press the SET key.
2. Press the START DELAY key.
3. Press an ARROW key. Continue until
Time/Day is shown on the display.
4. Press the ENTER key.