Xylem WS755 IMPROVED WASTEWATER/STORMWATER SAMPLER - Manual (Page 10)

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If a pump’s Size control is set to take a full-bottle discrete sample, further triggers will have
no affect on that pump. If a pump is set to take composite samples, each one will represent
the conditions at the time of that “qualified rain event”. This process will continue until both
the sample bottles are full and the Status LED remains lit all the time.
Using the Trigger Inputs as a source:
These inputs are generally used for connecting to a flow monitor, processor controller, or
other external monitoring device.
When using the Trigger In input jacks, leave the Rain Sensor input jack disconnected. Each
of the two Trigger Inputs control the corresponding pump separately from the other.
Upon being triggered by one of the Trigger Inputs, the Start Delay timer begins running.
When the delay timer has expired, the corresponding pump takes a sample based on its
Size setting. 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, and then stops.
Flow Proportional Sampling
a. To set the WS755 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.