WRAS-approved silicon level transmitters from Impress Sensors & Systems (June 2012)
A new range of water-approved submersible level transmitters is now available from instrumentation specialist Impress Sensors & Systems. The new IWSL range of WRAS-approved submersible level transmitters is suitable for continuous submersion in water, for a wide range of level measurement applications in reservoirs and drinking water storage tanks, but also for use in rivers, boreholes, aquifers, environmental monitoring and V-notch weir flow measurements.
Manufactured in the UK by Impress Sensors, the IWSL sensors use a piezoresistive media-isolated, silicon sensing technology and a stainless steel diaphragm, which provide excellent stability, repeatability and resolution. The sensor housing is 316L stainless steel, making it ideal for reliable, repeatable hydrostatic level measurement. The sensors are available in nominal pressure ranges from 1mWG to 100mWG.
When installing a product that will carry, receive or be submersed in water from the public mains water supply in the UK, it is a criminal offence if that device does not comply with the Water Supply Regulations or Scottish Byelaws.
The Water Regulations Advisory Scheme (WRAS) requires that these devices should not cause waste, misuse, undue consumption or contamination of the water supply and must be of an appropriate quality and standard. WRAS approval is the best way to demonstrate compliance as it is granted directly by representatives of the water suppliers and is therefore accepted by every water supplier in the UK.
Temperature-compensated
All IWSL sensors are WRAS-approved with a single WRAS approval number and are temperature-compensated, calibrated and supplied with a traceable serial number and calibration certificate. Operating (media) temperatures are from -20degC to +60degC in non-freezing media. Cable material is PUR, with elastomeric (EPDM) O-ring seals that are carefully selected for compliance with WRAS.
Sam Drury, sales & marketing director at Impress Sensors & Systems, said: “The electronics on the IWSL incorporate a microprocessor-based amplifier, which means no adjusting pots are required, which in turn means the electronics are very stable. The IWSL can also be custom engineered for specific applications, including various output options, accuracy levels and pressure ranges. The sensor is also suitable for battery operation when output options of millivolt or SDI-12 are selected.”
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