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3700 Portable Samplers
Section 4 Options and Interfacing Equipment
output for event marks both use pin D. When two samplers are
connected as master and slave, the master/slave inhibit signal
replaces the bottle number output.
When the master/slave pair connects to a flow meter with the
Master/Slave to Flow Meter Cable, the inhibit signal will be sent
to both the slave sampler and the flow meter. Since this signal
does not vary as it would if it were a bottle number signal, the
flow meter will not report a bottle number at the event mark.
Master/Slave Cycle – When installing the master/slave pair,
you must press the START SAMPLING key on both machines to
place both machines in the run state. The first machine started
becomes the master. After the master completes its routine, you
can service it and start it again.
After servicing, if you don't start the sampler again, the
master/slave cycle will halt after the second sampler finishes its
routine. The sampler cannot reverse roles unless both are in the
run state.
Continuous Master/Slave Sampling vs. Storm Monitoring
with Master/Slave Pairs – You can use master/slave sampling
in applications where you want to sample continuously or for
storm water runoff monitoring. In continuous sampling applica-
tions, service each sampler when it terminates its routine. After
servicing, press the START SAMPLING key to start the sampler
again and resume the master/slave cycle. The samplers can cycle
continuously because each has the same role - and usually iden-
tical sampling routines. If you use a master/slave pair with a flow
meter, the flow meter usually provides pacing controls rather
than sampler enable controls.
However, storm water runoff monitoring is a non-continuous,
event-driven application requiring a different servicing cycle. In
many storm monitoring applications, the master/slave pair and a
flow meter make up a monitoring system activated by a storm
event. The flow meter provides sampler enable controls triggered
by a storm event. After the storm event and the master/slave
pair have completed their routines, you must service and restart
the entire system. Not only must you service the samplers, but
you must reset the flow meter sampler enable control to detect
another storm event. You will find instructions for installing and
starting a master/slave pair in a storm monitoring application in
the STORM Sampling Check List. For information on installing
and resetting a system, see
the Teledyne Isco Storm Water
Runoff Monitoring Pocket Guide.
4-7
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