Is it possible to use pyroelectric detectors which contain neither a JFET nor an OpAmp thus only the pyroelectric element in gas analysis and flame detection?
The charges created in the pyroelectric crystal are very small and need to be amplified by preamplifiers with very high input impedances (up to some 10 GOhm). At ambient conditions (for example 60% relative humidity and 23C) such circuitry cannot be operated without disturbances. At least the high impedance part of the circuitry should be within the hermetically sealed detector housing. We therefore recommend using detectors with integrated JFET or OpAmp for gas analysis and flame detection.
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