Xylem WS705 IMPROVED COMPOSITE/DISCRETE WATER SAMPLER - Manual (Page 10)

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Holding the Trigger Input active past the end of the sample will cause the pump to continue
until the Trigger Input is released. When the sample is complete, the pump reverses, then
stops.
Flow Proportional Sampling
a. To set the WS705 up to take flow proportional samples, a flow monitor must
be attached to the control panel. In this configuration, the sampler is
designed to take a sample every time a specific amount of flow has passed
through the flow monitor.
b. The flow monitor must provide a momentary switch closure (250ms or longer)
or a pulse of 4-30VDC, whenever a sample is to be taken. The output of the
flow monitor must be wired to a 2-wire RCA jack as shown in Appendix C.
The phone plug is then inserted into the Trigger In jack on the control panel.
c. Set the Sample Interval knob to External Trigger mode and the Sample Size
knob to the desired sample size. The sample will be taken, flow
proportionally, as directed by the flow meter.