Intrinsically safe pressure transmitters for use in hazardous areas
Common features of all Y-line pressure transmitters include a very low temperature error, with correspondingly high measurement accuracy. Thanks to the integrated temperature sensor and an additional digital circuit, the range of envisaged operating temperatures can be divided into as many as 120 sections with a width of 1.5 Kelvin. During factory calibration, a mathematical model is used to calculate individual compensation values for TK zero point and TK amplification for each of these sections; the values are then stored in the transmitter. During operation, these values are fed into the analog signal path according to the temperature, without reducing the 2 kHz signal processing dynamic. A relevant total error band for measurement purposes of ±0,8 %FS can therefore be attained over the typical temperature range of -10 °C to +80 °C. This includes all error sources, from linearity to range tolerance. Several compensated temperature ranges are available, such as -10 to 80°C, 10 to 40°C or 0 to 50°C.
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