Pressure Measurement; Humidity Measurement; Co₂ Measurement; O₂ Measurement - Sartorius BioPAT Xgas Betriebsanleitung

Design and Function
Fig. 2: Measuring setup of the
CO sensor
2
Fig. 3: Measuring setup of the
O sensor
2
12 Operating Instructions BioPAT
3.1.1

Pressure Measurement

A piezoresistive silicon pressure sensor is used to
measure the pressure.
3.1.2

Humidity Measurement

A capacitive polymer sensor is used to measure
the humidity.
3.1.3 CO₂ Measurement
The CO₂ sensor comprises an IR radiation source, a
detector and the reflection measuring cell (Fig. 2).
The infrared beam is reflected by the gas-filled
measuring adapter. The light, now weakened by
the CO₂, is measured by the detector.
A translucent sapphire disc prevents the optical
components from getting soiled by constituents
of exhaust air.
3.1.4 O₂ Measurement
The BioPAT Xgas oxygen sensor is based on an
®
oxygen pump cell and runs independently of
reference gases. Applying voltage to the cell
moves the oxygen ions from the cathode to the
anode and generates current. Through a diffu-
sion barrier in front of the cathode, a saturation
current is generated by increasing the supply
voltage, which allows measurement of the
ambient oxygen concentration.
Xgas
®