This yields a host of advantages, as all the key pressure measurement components are protected from humidity and condensation.
The interior wiring is implemented with short, lightweight bonding wires, while sintered-in pressure-resistant glass lead-throughs feed the transmitter signal output. 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 RFI resistant up to field strengths of 250V/m and for frequencies of up to 4GHz.
Series 4 LC - 9 LC pressure transmitters offer two output signals: a ratiometric analogue voltage output and a digital integrated circuit interface (I2C). The ratiometric signal avoids the need for an expensive voltage reference in the support electronics to the A/D converter, and there's no additional effort and expense for compensation and calibration. For a voltage supply of 5,0V, the output signal is specified as 0,5 - 4,5V. The transmitters provide constant protection against over-voltage and polarity reversal on all lines up to ±33Vdc.
For years, the I2C 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 2.7-3.6Vdc, and they are ready to supply the current measured values 5ms after switch-on. Appropriate ON/OFF operation and low power consumption make these transmitters ideally suited for mobile applications.
With an analogue output, the transmitters can be used at temperatures of between -40 °C and +150 °C, and with an I2C output the range is from -40 °C to +80 °C. The full scale pressure ranges for the analogue version extend from 2bar to 1,000bar, and for the digital version from 2bar to 200bar. The internal sampling rate offers a very good dynamic range of 2kHz. Low power consumption during continuous operation is another benefit. In this regard, the digital version requires less than 3mA, and the analog version requires about 8mA.