Xylem WS700R REFRIGERATED WASTEWATER SAMPLER - Manual (Page 9)

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Sampling continues as Trigger-Delay-Sample-Reverse-Interval-Sample-Reverse-Interval-
Sample-Reverse … until the sample bottle is full. When the bottle is full, the Status LED
remains lit constantly.
VIII. Discrete Sampling
A discrete sample is a single sample put into the same bottle, thus being a sample at one
point in time. Set the Sample Size control to “Full”. Once started, the pump will continue to
run until the sample bottle if full.
As with composite sampling, the Start Delay timer begins when the sampler is trigger by the
Rain and Water Sensors and the first sample is taken when the timer expires. If the Delay
control is set to zero, sampling begins immediately. The Status LED blinks every 2 seconds
while the delay timer or the pump is running and remains lit constantly once the sample
bottle has been filled. At the end of sampling, the pump reverses for 15 seconds.
IX. External Trigger Mode
When the Sample Interval control is set to the “External Trigger” position, the sampler can
be triggered externally by either the Trigger In jack or the Rain Sensor input. This mode is
useful in applications where sampling occurs based on readings from a process controller,
SCADA system, flow monitor, auto-dumping rain gauge or other remote monitoring devices.
Using the Rain Sensor as a trigger source:
This mode is normally used with an auto-dumping rain gauge that empties itself every 24
hours. Set the Sample Interval control to External Trigger. Set each pumps Size control
based on desired composite sample size or set to Full for a discrete sample.
The sampler will be triggered when both the Rain and Water Sensors detect moisture. If the
Water Sensor is not needed, use one of the shorting plugs supplied with the sampler to
defeat it by plugging it into the Water Sensor input jack. Place the Rain Sensor at the
desired height in the rain gauge. When the Rain Sensor detects moisture, the sampler will
start.
Once triggered by the Rain Sensor, the Start Delay timer begins running and the Status
LED begins blinking every 2 seconds. When the timer expires, the pump takes a sample
based on the Sample Size settings. When the sample is complete, the pump reverses for
15 seconds, then stops. The sampler cannot be re-triggered until the rain gauge empties