WS755 Improved Stormwater/Wastewater Sampler

The sampler consists of a rugged, rainproof and lockable wheeled transport case with a comfort grip handle on top and retractable handle on the back. The enclosure houses a control panel with two peristaltic sampling pumps, two sample bottles, two pickup hoses and strainers with quick-disconnect fittings and a rechargeable battery in a self-contained battery box.

The WS755 Sampler can take two individual “time weighted” composite samples, or the sampler can be set to take full-bottle discrete or “Grab” samples. Each pump has its own sample bottle and control for setting the size of individual samples. This allows each pump to be set as either a composite or discrete sampler independently of the other or, in the case of two composite samplers, have different size settings for each pump.

A delay timer can be set to start sampling after a preset time. This allows multiple samplers to be deployed in the field and have them turn on at the same time. The delay can also be used to hold off sampling to let the water source flush out debris or other contaminants.

After each sample, the pumps will reverse for 15 seconds. This clears any debris from the strainer at the end of the pickup hose and also empties water from the hose so the next sample is not contaminated by the previous one.

Inputs are provided for triggering the sampler based on water level, a rain gauge sensor or signals from an external process controller or other monitoring device. Individual outputs are also available for monitoring when each of the pumps has taken a sample, using a data logger or similar recording device.

Composite Sampling

A composite sample is a series of smaller samples put into the same bottle, thus showing an “average” sample over time. Set the Interval control to the desired time between samples (do not select the External Trigger position). Set the Size control for the corresponding pump to the desired sample size. Note that the sample size settings are approximate and apply to a head height of four feet. For heights other than four feet, refer to the chart inside the front of the sampler. Each pump can have different size settings but will share the same Sample Interval setting.

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 Size control for the corresponding pump to “Full”. Once started, the pump will continue to run until the sample bottle if full.

Using the external trigger function

When the Sample Interval control is set to the “External Trigger” position, the sampler can be triggered externally by inputs from either the Trigger In jacks 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.