Technical & Scientific Equipment supply ‘Pisello’ type miniaturised absolute pressure transmitters (series 20P) from Keller, the Swiss pressure sensor manufacturer. These pressure transmitters feature optimised temperature compensation and are available in measurement ranges between 10 and 600 bars.
A circuit in the transmitter compensates the Pisello against fluctuations in operating temperature. The circuit’s EEPROM has stored values of ‘zero point’ and ‘amplification gain’ for each 1.5°K wide part of the transmitter’s temperature range that was earlier determined by mathematical interpolation during the calibration process. During operation, the stored values corresponding to the operating temperature are switched-in.
In this way, temperature fluctuations of up to 100°K are compensated. The Pisello pressure transmitter transmits a measurement accuracy of ±0.5% FS, including non-linearity and hysteresis, over the compensated temperature range.
The output signals from the miniature pressure transmitter (which reacts quickly using its signal bandwidth of 2 kHz) vary between 0.5 and 4.5V. The Pisello pressure transmitter operates with voltage supplies from 8 to 28V, has a diameter of 13 mm and a mass of 11 grams, making the Pisello suitable for mobile application use.
These pressure transmitters can be used in areas of limited space. The housing feature of the Pisello pressure transmitter along with its threaded pressure connection (M8, M6 or 10-32 UNF) is entirely welded and meets the requirements for protection class IP67.