The Compact Pirani Capacitance Combination Gauge PCR 280 has been designed for vacuum measurement of gases in the
pressure range of 1000 to 10-4 Torr.
The gauges must not be used for measuring flammable or
combustible gases which react in air.
The PCR gauge is a Combination Gauge consisting of a Pirani
sensor and a Capacitive Diaphragm Sensor. Both sensors are
At low pressures, only the signal of the Pirani sensor is used for pressure measurement; at high pressures, only the signal
of the capacitive diaphragm sensor is used. To determine the output
signal in the intermediate range, both signals are used
proportional to the pressure.