Pneumatic diaphragm pump for water sampling

AxFlow has announced the development of a compact pneumatic diaphragm pump that can be used in the field for groundwater sampling applications and sample pumping in the laboratory

AxFlow has announced the development of a compact pneumatic diaphragm pump that can be used in the field for groundwater sampling applications and sample pumping in the laboratory.

The gentle delivery by displacement ensures high levels of accuracy.

The Unitec UD6 is an ATEX conforming pump offering a maximum capacity of 250l/h at pressures up to 7 bar, that can be infinitely controlled via the compressed air supply.

The pump housing is constructed from conductive PTFE, which displays high levels of resistance to chemicals.

Due to its conductivity, the Unitec UD6 can be used in explosion-proof areas and for inflammable liquids, when grounded.

The one-piece diaphragms are machined from solid PTFE and do not include any seals.

Within the water industry, it is ideally suited for monitoring groundwater in landfills.

Here the pump can be used for pulling samples from wells that have diameters above 80mm and will operate at depths of up to 50m.

The inclusion of an inlet strainer on the suction port prevents the pump from becoming clogged by solids.

For sample pulling applications, the pump comes with a cable pin and hose connections for the air inlet, air exhaust and discharge port.

For laboratory applications, the pump is supplied with a purpose-designed connection kit comprising hose connections for the air inlet, suction and discharge ports.

Described as an all-position pump, the Unitec UD6 has excellent dry suction properties and when used in submersible applications it is resistant to dry running and will withstand excessive pressure.

Measuring just 78mm in diameter and 150mm in length, it is a compact unit that allows it to be positioned in a carrier tube for submersible duties and stand mounted in the laboratory.

Being a pneumatic diaphragm pump the Unitec UD6 is self-priming when dry, so it is not necessary to fill the suction line of the pump.

However, the suction lift capacity is considerably higher when the pump is filled with liquid.

During normal operation, the maximum stroke frequency is 800 per minute.

The pump is suitable for dry running during slow operation, but if run dry at high stroke frequencies it will suffer premature wear.

As the pump is air driven it can be operated for long periods without operator supervision.

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