Tel: +44 (0) 1242 243006

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Badminton Close, Naunton Lane, Leckhampton,
Cheltenham, Gloucestershire GL53 7BX UK
Tel: +44 (0) 1242 243006
Fax: +44 (0) 1242 222487


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DFM All-Plastic Variable Area Flowmeters

Over the last twenty years many thousands of DFM units have been supplied to practically every industry in the UK.

All units are available on quick delivery from our extensive stock.

They are supplied with BSP female end fittings or PVC solvent weld sockets as standard. Stainless Steel inserts or Cast Steel unions are available at extra cost. See table in PDF document.

Click here to download the PDF file for full details

  • Advanages
  • Materials
  • Technical Data
  • Installation and Use
3-50,000 litres/hour liquid in 28 ranges each with 10:1 operating span
5 different overall lengths from 165-350mm
Choice of tube materials depending upon operating temperature and pressure up to 100°C and 10 Bar
Positive pipe 0-ring sealing requiring less tightening effort when installing
Standard or magnetic floats (where alarms required) of identical mass ensure identical flow ranges when changing
Optional bi-stable adjustable alarm on rear slide
Optional 4-20 mA transmitter
Special scales produced for liquids and gases other than water or air 

Tube Material: Polyamide, PVC, Polysulphon

End Fittings: Rigid PVC socket connections for adhesive pipe coupling. BSP threads available.
Special stainless steel inserts available.
Cast iron end caps for higher temperature

Float: 6 different overall lengths from 165-350mm

Float Stops: PVDF

0-Rings: Standard EPDM, Special Viton, etc.
Technical Data
Accuracy: ±2.5% full scale
Max Pressure: 10 Bar operating (at 20°C - see chart for operating pressures versus temperature)
Temperature: PVC 60°C, PA 75°C, PSU 100°C (see chart) for operating pressures versus temperature
Scaling: L/Hour H20 standard plus 0-100% max flow. Special product scales available
Flow Ranges: See table in PDF file and quote model number

Installation and use:

Usually supplied with with BSP or socket connections for imperial pipework. Metric socket fittings available at no extra cost.

Vertical - flow upwards. For best results ensure pipework vertical to within 2/3°.

For liquids may be installed upstream or downstream. For gases install valves downstream only.

Optional equipment

Up to 3 in number bi-stable or mono-stable switches, comprising volt free contacts to handle 240V 5 amp max current. A 4-20mA transmitter is also available ex stock. The unit is ATEX Exi Certified as standard.

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Badminton Close, Naunton Lane, Leckhampton, Cheltenham, Gloucestershire GL53 7BX UK Tel: +44 (0) 1242 243006  Fax: +44 (0) 1242 222487 e-mail:


Your co-operation in pulling out all the stops to supply a replacement turbine flowmeter has meant we have not lost any production time. I am a great believer that such service should not go unrecognised.

Director of Engineering
Delta Biotechnology

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