Tiny Pressure Transmitters meet miniaturisation demands

Keller has introduced the compact Series LD pressure transmitters. According to the company, these tiny transmitters are setting new trends in OEM applications, as miniaturisation is now becoming a reality.

In its Series 4 LC ...9 LC pressure transmitters, the special ASIC for signal processing is fitted directly next to the pressure sensor, in the same housing, under oil, and with the exclusion of air. This yields a host of advantages in terms of application: all the key pressure measurement components are now protected against the risks from humidity and condensation.

The interior wiring is implemented with short, lightweight bonding wires, while sintered-in pressure-resistant glass lead-through feed the transmitter signals out. Together with the high-grade stainless steel housing, they form a Faraday cage around the measuring system, acting as feed-through capacitors. This makes the CiO technology absolutely RFI resistant up to field strengths of 250V/m and for frequencies of up to 4GHz.

Series 4 LC ...9 LC pressure transmitters offers two output signals: a ratiometric analogue voltage output and a digital inter-integrated circuit interface (12C). The ratiometric signal eliminates the need for an expensive voltage reference in the support electronics to the A/D converter, with no additional effort and expense for compensation and calibration. For a voltage supply of S,oV, the output signal is specified as 0,5 ... 4,5V.

For years, the IBC interface has been regarded as the serial standard in
embedded systems. Up to 128 OEM transmitters in Series 4 LC ...9 LC can be addressed successively by one I2C master in order to call up the current pressure and temperature values from the transmitters (slaves). With an I2C output, the pressure transmitters can operate with a voltage supply of only 2,7 ... 3,6 VDC, and they are ready to supply the current measured values 5ms after switching on. Appropriate ON/OFF operation and low power consumption make these transmitters ideally suited for mobile applications.

For more information, please contact:-

Keller (UK) Ltd.
Winfrith Technology Centre, Dorchester DT2 8DH. UK
Tel: +44(0) 845 643 2855 Fax: +44(0) 845 643 2866

October 2015

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