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3700 Portable Samplers
Section 4 Options and Interfacing Equipment
Figure 4-4 1640 Liquid Level Actuator
4.3.5 Master/Slave
Connections
4-6
You can set the actuator to control the sampler in two modes:
Latch Mode – The sampler continues the sampling routine even
though the liquid level has receded and liquid no longer contacts
the sensor.
Toggle Mode – The sampler will halt the routine when the
liquid ceases to contact the sensor.
To connect the actuator to the sampler, attach the actuator cable
to the flow meter connector on the rear of the sampler. Refer to
the Liquid Level Actuator Instruction Manual provided with the
actuator for additional information. You can use the actuator
with an Isco flow meter if you have the Y-Connect Cable.
You must configure the sampler to respond to the actuator. Infor-
mation configuring the sampler for use with the actuator can be
found in the discussion of the Enable Pin configure option in
Section 3.9.14.
Using samplers in master/slave configuration operates samplers
in pairs; while one sampler performs a sampling routine, the
other sampler awaits a command to begin sampling. Installing
two samplers as master and slave near manholes allows you to
double the sampling capacity, thereby reducing the number of
visits to the manhole.
Yo u
m u s t
c o n n e c t
Master/Slave-to-Flow Meter Cable. Attach the cable to the flow
meter connector on both samplers. You must configure both sam-
plers in the master/slave mode. Enabling the master/slave mode
is discussed in following sections.
While the master sampler is performing a sampling routine, it
sends an inhibit signal out on pin D. The slave sampler, receiving
the signal on pin F, remains dormant until the master sampler
completes its routine. At this point, the sampler reverses roles.
The master/slave inhibit signal output and the bottle number
t h e
s a m p l e r s
w i t h
t h e
3 7 0 0
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