DFM All-Plastic Variable Area Flowmeters

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Quick Spec:

  • 5 different overall lengths from 165-350mm

  • 3-50,000 litres/hour liquid in 28 ranges each with 10:1 operating span

  • 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

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.

Advantages

  • 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

Materials

  • 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. available

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

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

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

Valves
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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