Keeping tabs on compressed air
May 2004
Flow Measurement & Control
The new Metris compressed air flow monitors from IFM Electronic provide a convenient and cost-effective way of monitoring compressed air consumption, making it easy for users to ensure that this expensive resource is utilised effectively and economically.
Compact in design, Metris monitors are suitable for straightforward in-line installation with integral displays that give an instant on-the-spot readout of airflow rate. The displays may also be used to show peak flow rate or accumulated consumption, and they are also used as an aid for entering set points and other operating parameters.
In addition to the built-in displays, the monitors also feature analog outputs to facilitate remote monitoring, pulse outputs to make it easy for external equipment to record total consumption, and switched outputs which provide an immediate indication if the flow rate exceeds a preset, user-defined value.
IFM's innovative Metris compressed air flow monitors are offered in two versions, one covering flow rates from 4 to 1 250 Nl/min, the other covering flow rates from 12,5 to 3750 Nl/min.
For both models, the operating point for the switching output can be set over virtually the whole of the operating range, allowing small changes in flow, which may, for example, be caused by leaks, to be readily detected. As a further aid to precision, the analog output span can be adjusted, so that the entire 0 to 10 V output signal range relates to the band of pressures that is of particular interest.
To ensure long-term reliability, high accuracy, and a fast response time, Metris compressed air monitors use sensing elements which operate on the calorimetric principle, and which have no moving parts. All measurements are scaled to standard units - Nl/min or Nm3/h - and all are automatically compensated for variations in temperature and pressure.
For more information contact Chris Huxham, Shorrock Automation, 012 345 4449, sales@shorrock.co.za, www.shorrock.co.za
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