On stand 144 at the Water, Wastewater & Environmental Monitoring (WWEM 2014) exhibition, from 5-6 November 2014 in Telford, instrumentation specialist Impress Sensors & Systems Ltd will be showcasing a number of submersible level, pressure and temperature transmitters.
For visitors to stand 144, the main focus will be on the new IMTG range of gauging level transmitters, manufactured in the UK by Impress Sensors. The transmitters are designed for continuous submersion in liquids such as water, fuels and oils, but have been redesigned to better suit the applications and the range extended to include a new plastic (Delrin®) version and a digital RS485 Modbus version.
IMTG transmitters are suitable for applications in small (1 - 10 m depth) tanks or containers, where conventional mechanical level switches and sensors are not suitable because of reliability issues and a higher degree of level ‘control’ and measurement is required. Typical applications include measurements of static tank level, container or chamber level, and vehicle tank level, as well as rainwater-harvesting systems, standby generator fuel monitoring equipment, and asset monitoring of IBCs (intermediate bulk carriers) and storage tanks. Water-approved versions of the transmitter are also available for drinking water applications.
The IMTG transmitters use a piezoresistive, silicon pressure sensing technology and a stainless steel diaphragm, which provide excellent stability, repeatability and resolution. The sensor housing is made from stainless steel, making it ideal for reliable, repeatable hydrostatic level measurement. An engineering polymer (DuPont Delrin) version is available for use in corrosive media such as diesel, petrol and other aggressive chemicals. This is particularly useful when the tanks have external earthing issues that would normally affect metal products. This is common in remote telemetry sites with standby generators.
The sensors are available in nominal pressure ranges from 1.0 mWG to 10 mWG. A variety of cable materials are available, including PUR as standard, with PVC, FEP and TPE as options, enabling compatibility with any media.
All IMTG sensors are temperature-compensated, calibrated and supplied with a traceable serial number and calibration certificate. Operating (media) temperatures are from -20°C to +60°C in non-freezing media.
An RS485 Modbus version of the IMTG range (and other submersible transmitter ranges) will also be launched at the show. These transmitters are supplied with a digital RS485 interface and Modbus RTU output. The electronics incorporate a microprocessor-based amplifier, with level and temperature measurements made possible by RS485 Modbus RTU serial communication. Impress provides a standard software package, which enables the user to re-range, calibrate and adjust some parameters of the device. There is also a facility to data log via the software, which is useful for checking installation and behaviours of the application.