TECHNOLOGY ROUNDUP
Level transmitter suits marine environments
A new range of submersible hydrostatic level transmitters has been launched, which can be used in depths of up to 200m. The transmitter offers an SDI-12 digital output and an inbuilt high accuracy temperature sensor. The SDI-12L range from Impress Sensors & Systems uses either a stainless steel silicon-based pressure sensor or a ceramic pressure sensor in marine-bronze. Both versions use piezoresistive technology, which provides long term stability and repeatability of measurements. The transmitter is ideal for a wide range of applications including the monitoring of river and reservoir levels, tanks and vessels in process plants, seawater and estuary levels, borehole water levels, tsunami and tidal monitoring systems, wave height measurement, environmental monitoring and V-notch weir flow measurement. The stainless steel version offers a higher resolution of pressure measurement to around 12-13 Bit and has a much lower signal-to-noise ratio. The ceramic pressure sensor version is better suited to marine use, where standard devices may suffer from corrosion. These units are ideal for seawater, estuary and saline applications. In borehole pump applications, for the pumps to operate efficiently, they must maintain a level of water above them to prevent them running dry. The SDI-12L can either be submersed with the borehole pump and attached to the bracketry or retrofitted.
www.impress-sensors.co.uk
Environmental data logged in remotest Scotland
Scottish Water is using over 60 Senator+ datalogging systems to collect, collate and transmit data about various environmental conditions in some of the remotest areas of Scotland. Reservoir levels, compensation channel levels and flows, and pipeline flow rates from treatment works to compensation returns all need to be monitored, but they can often be located in hard to access and non-GSM covered places. The Senator+ was developed by HWM in conjunction with satellite communication specialist Wireless Innovation; the company says it is purposely designed for just such situations. Where there is no infrastructure for more traditional telemetry services – no GSM/SMS signal or too remote for PSTN lines – the Senator+ is able to use its MicroSAT satellite data transmission technology and solar-charged battery power to provide reliable and maintenance-free datalogging services. Some of Scottish Water's installations can only be reached by various combinations of all-terrain four-wheel-drive vehicles, quad bikes and even hiking. Fortunately, after the initial installation, the units are self-sustaining, and no subsequent maintenance has been needed or undertaken.
www.hwm-water.com
Low-cost flowmeter is ideal for large pipes
A new range of insertion turbine flowmeters for applications where installation and removal from the pipeline without interruption to flow, is more important than extreme accuracy, are now available from Filton Process Control. Series 5000 flowmeters are simple to install and remove and are particularly suitable for large pipelines of 100mm upwards, where the cost of inline meters can be prohibitive. These low-cost flowmeters can be installed and removed through a suitable valve while the flow line continues to remain under pressure. In addition to low cost and optimum flexibility, they provide wide rangeability and improved linearity. The principle of operation is as fluid flows through the turbine assembly it causes the blades of a freely supported rotor to turn at a speed directly proportional to the flow velocity. A pick-up assembly fitted into the insertion stem above the rotor detects the passage of each blade tip and generates a sine wave output, the frequency of which is proportional to the turbine rotor speed and hence velocity and thereby flow rate. This signal may then be used in conjunction with local or remote signal conditioning electronics. The flowmeters can be fitted with different, interchangeable rotor assemblies and are available with a wide range of electronic signal conditioning and readout instruments.
http://filton.com/products/
Serinus gas analyser series wins EN approval
Ecotech, one of the world’s leading manufacturers of air quality monitoring equipment is pleased to announce EN approval for its Serinus gas analyser range. According to Ecotech’s General Manager, Nicholas Dal Sasso, “The approvals are a vital step in Ecotech’s expansion within Europe and provides the European community with a greater choice of ambient gas analysers”. Nicholas went on to say “We are confident that the Serinus will give our European customers the performance they need, with Ecotech’s proven reliability, along with enhanced data transfer and communication.” The Serinus gas analyser series are utilized in many different applications including air quality monitoring stations, roadside monitoring, EPA networks and research organizations. Further specialist models will be progressively released. The Serinus series ambient gas analyser derives its name from the genus (group) of the canary, which was the first effective ‘method’ used to detect harmful gases in coalmines. Just as the humble canary helped protect the health of early coal miners, so too will the new Serinus gas analysers play their part in helping deliver a cleaner, safer, healthier global environment.
www.ecotech.com
May 2010 Sampling & Monitoring 13
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