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Submersible level transmitter offers high accuracy and stability

24 November 2009

A range of submersible hydrostatic level transmitters has been launched, which can be used in depths of up to 200 metres. The transmitter offers an SDI-12 digital output and an inbuilt high accuracy temperature sensor.

Submersible level transmitter offers high accuracy and stability
Submersible level transmitter offers high accuracy and stability

The SDI-12L range of submersible level transmitters 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 stainless steel version offers a higher resolution of pressure measurement to around 12-13 Bit and has a much lower signal-to-noise ratio, providing a very smooth and accurate method of level measurement.

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.

The SDI-12L offers measurement ranges from 0.5mWG up to 200mWG. The output units can easily be adjusted to mmWG, cmWG, inHg and all the standard engineering units required via the SDI-12 interface and command structure. Temperature range of the transmitter is from
–20 deg C up to +60 deg C. Accuracy of the inbuilt temperature sensor is less than ±0.1% of full-scale output.

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