Flow Meters
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Flow Meters – August 2008 DELIMON Cooling, Ramsden Court, Ramsden Road, Rotherwas Industrial Estate, Hereford, HR2 6LR, UK. Tel: +44 Cooling Flow Meters These units are manufactured in a wide range of sizes and specification options but all have the same basic function. A dial and mechanical indicator continuously monitor the flow rate at any given time whilst electrical switches can be specified to signal when a particular level has been reached during increasing or decreasing flow rates. Switches are field adjustable over the full range. Where batching, trending, totalising or recording is required, all Delimon units can be supplied with a 0-10V or 4-20mA output. All sizes are manufactured to the same simple design concept, the main characteristics of which ensures that the pressure drops are confined to an absolute minimum (see 'Pressure Drop' charts) across the vane orifice at full flow, with viscosities as high as 600cS. Sizes are defined by pipe size and/or maximum flow capacity and every flow switch is individually calibrated so that full scale deflection is used in each application, i.e. the maximum scale reading coincides with the maximum requirement of system as specified by the customer. Calibration may be in any units with single or duel scale to specification. Variable Orifice/Swing Vane Principle The flow switch body houses a spring-loaded valve plate (vane) which pivots off-centre in a hemispherical cavity. Thus the vane and cavity have a variable area orifice relationship. This gives both high flow range and a linear relationship between flow rate and vane displacement. The vane directly operates both the indicating needle and an adjustable cam, which in turn triggers the micro-switch at any chosen setting of flow rate. Two switches can be supplied to provide high and low (or 'low-low') flow switching. All metal construction – no tubes of glass or plastic to break. (0)1432 365000. Fax +44 (0)1432 365001. Email: info@delimon.co.uk. Web: www.delimon.co.uk. Spring loaded mechanical design – requires no straight pipe run and not affected by orientation. Limited movement on internal parts – minimal wear and down time. Module design – reduces maintenance costs, down time and production loss. Direct indication and field adjustable switch(es) – monitors critical flows and provides alarm(s). 1% of rate repeatable switch set point – accurate and reliable through all operation cycles. Weatherproof enclosure box to IP65 (Nema 4). Flow through design – minimal pressure loss. Individually calibrated to customer specification – ensures accuracy. Adjustable under operating conditions. Scale is in units (e.g. litres/minute). Large range of body materials available. Size range from 8mm (¼") to 200mm (8"). May be installed in any position. Orientation of enclosure box easily changed. High switch rating – 10 to 15 Amps. ATEX approved Explosion-proof models available. Will pass twice the maximum indicated flow. Acts as non-return value.

Flow Meters – August 2008 DELIMON Cooling, Ramsden Court, Ramsden Road, Rotherwas Industrial Estate, Hereford, HR2 6LR, UK. Tel: +44 Applications • Water (clean or dirty) • De-mineralised water • De-ionized water • Petroleum based oils • Synthetic base oils • Coolants • Solvents • Paints • Corrosive fluids • Air and gases Low Flow/Piston Style Principle As a fixed tapered needle passing through an orifice in the face of a piston, completely seals the port to port connection when the piston is seated. As flow commences the piston is displaced against a 4 psi differential spring and moves...