Severn Trent Services Chooses Watson-Marlow Bredel Pumps For Reliable On-Line Sampling

Reliability under all operational conditions and the ability to deliver a consistent, volumetrically accurate sample over long periods were the key factors when Severn Trent Services turned to Watson-Marlow Bredel peristaltic pumps for the delivery of samples to their range of on-line water quality monitors.

Series 1000 ISE (Ion Selective Electrode) monitors can be configured for monitoring ammonia, fluoride or nitrates, with the 504MC2 twin-channel pumps used for continuous delivery of two sample streams to the ion selective electrode.

By using a peristaltic pump, the sample is contained within the tube throughout the entire pumping process. With no other contact components, there is no risk to the integrity of the sample by contamination from external sources, while the straight through flow path and smooth pumping action obviate any possibility of sample degradation through shearing or agitation. The pumps are fitted with colour coded manifold tubing, the largest bore tube providing flow rates up to 0.48 ml/rev.

Sampling flow is over the range 200 to 500 ml/min at a minimum pressure of 0.34 bar and a maximum of 0.69 bar; sampling temperature is from 0°C to 50°C. Sample and electrode are temperature controlled by an integral mechanical heat exchanger.

The monitoring of ammonia, fluoride and nitrates is required across a wide range of applications including:

Ammonia: compliance monitoring of discharge streams, intake protection for drinking water plants, optimisation of the chloramine treatment process for drinking water, and controlling ammonia levels in industrial processes.

Fluoride: monitoring waste streams from metal finishing plants and of fluoride leachate into coolants, control of fluoride levels in drinking water, monitoring fluoride levels in baby foods.

Nitrates: compliance and control of waste and process waters, blending de-nitrified water to ensure finished water is below MCL, monitoring surface water for treatment against algae blooms, controlling nitrate levels in food and beverage production processes.

Watson-Marlow Bredel pumps are extensively used in many sectors of industry on condition monitoring applications and on numerous similar duties where precision, absolute reliability and product integrity are major considerations. Currently the range of peristaltic pumps available covers outputs from microlitres per minute to 80 cubic metres per hour at pressures up to 16 bar.

For more information contact Mike Sullivan or Heather Beale, Watson-Marlow Bredel Pumps on Tel: 01326 370370 or Fax: 01326 376009 or visit us at

For more press information contact Jenny Holliday or Charlotte Mills, icas public relations on Tel: 01442 261199 or Fax: 01442 236401 or e-mail [email protected]

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