WS705 Improved Portable Composite/Discrete Water Sampler

Description

The WS705 Water Sampler is designed specifically to meet a wide variety of sampling requirements including industrial discharge, process control, water and wastewater treatment plants, sewers, rivers and streams.

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 peristaltic sampling pump, sample bottle, pickup hose and strainer with quick-disconnect fittings, a rechargeable battery with 3-stage charge controller in a self contained battery box, and a energy efficient regulated battery charger.

The WS705 Sampler can take individual “time weighted” composite samples, or it can be set to take a full-bottle discrete or “Grab” sample. This is accomplished with a Sample Size control having one position being reserved for “Full” bottle”. A Sample Interval control sets the time between individual composite samples and has a provision for allowing the sampler to be triggered from external sources.

A Start 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 pump 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 a signal from an external process controller or other monitoring device. An output is also available for monitoring when the pump is taking samples, using a data logger or similar recording device.

Composite Water Samples

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 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.

Discrete Water Samples

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.

Specifications

Operating Temperature: 32° to +158°F (0° to +70°C)

Materials: Enclosure: Expanded UV protected PVC

Bottle: 2.5 gallon Polyethylene

Pickup Hose: 15' reinforced PVC 1/4" ID polyethylene

flexible tubing section with intake strainer

Pump Tubing: Norprene 1/4" ID, 7/16” OD

Sample Pump:

Flow Rate: 1000 ml per minute at a 4 foot head

Type: Peristaltic

Maximum Lift: ~20 ft (6 m)

Battery Life: ~1 hour, continuous pumping under load

Standby: 3 months while still retaining enough power to run the pump to capacity

Start Delay: 16 time settings from 0 to 12 hours

Composite Interval: 15 time settings from 5 min. to 12 hours plus an External Trigger mode setting

Sample Size: 15 composite sample sizes from 50 ml to 2 liters plus a Full Bottle discrete setting (Approximate sizes at 4 foot head)

External Trigger Input: 250mS minimum pulse width Switch closure or 4-24VDC

Pulse Output: 5VDC one-second pulse 1000ohm output impedance

Bottle Switch Input: Switch closure Input Floating read switch in bottle

Rain and Water Sensors: Optional moisture sensors or switch closure inputs

Internal Fuse: 10A Slow-Blow

Size of unit: 22x18x10 inch (56x45.7x25.4 cm) (HxWxD)

Weight: 26 lb (11.7 kg) (Shipping Weight 28 lb (12.7 kg))