COSA Xentaur COSA 707 - Manual (Page 10)

COSA Instruments USER MANUAL COSA 707
www.cosaxentaur.com 10
Draft and temperature are measured at the tip of the sampling probe.
5.1 Gas flow diagram
Gas flow diagram with CO purging pump
Position Description
1 Sampling probe
2 Triple hose
3 Condensate separator
4 Star filter
5 Non return valve
6 Gas pump
7 Sensor chamber
8 O
2
-Sensor
9 2. sensor
10 3. sensor
11 4. sensor
12 5. sensor
13 CO Purge pump
14 Pressure sensor *
* optional
5.2 Electrochemical measured principle
The oxygen content of the sample gas is measured with a 2 electrode electrochemical
sensor.
Toxic gases like carbon monoxide (CO), nitrogen oxide (NO), nitrogen dioxide (NO
2
), sul-
phur dioxide (SO
2
), and hydrogen sulphide (H
2
S) are measured with 3 electrode sensors.
The electrochemical sensors are based on gas diffusion technology.