Impress Sensors & Systems has introduced the XMD range of smart differential pressure transmitters for process-industry applications. The transmitters can be used for level measurement of closed, pressurised tanks; pump and filter control; or for closed-pipe flow measurement in conjunction with an orifice plate, Venturi or nozzle. The XMD range is ideal for flow applications due to the device's ability to switch the output from a standard linear output to a square-root extraction where flow rate can be output.Target industries include chemicals, paper and pulp, petrochemicals, energy and power, food and dairy and pharmaceuticals. The XMD has a differential pressure range from 75mbar up to 2 bar and with a static over-pressure capable of 130 bar line pressures. The calibrated pressure range can also be turned down 10:1 times, which means that a 75mbar range can give a full-scale output at 7.5mbar, while still maintaining the 130 bar line pressure.
A 5:1 turn-down ratio maintains the accuracy of the transmitter, which is +/-0.1 per cent FSO. Outputs available are 4-20mA as standard with the option of having Hart communication. If this option is selected, the XMD is Atex-approved as standard. The device is safe for Zone 0/1 and an Ex d version is available with a flameproof enclosure for Zone 1 applications.
The XMD range is designed for harsh process manufacturing environments and so the electrical enclosure is a two-chamber aluminium die cast, powder coated with the option to include an integrated smart display. The optional display is an LCD with a visible range of 32.5 x 22.5mm. There is also a textual display and a 52-segment bar-graph that runs along the bottom of the display for easy interpretation of the output from the device. Even with this display option, the XMD is still rated to IP67.
