Preparation for Installation 27
Example of sample conditioning
1
Sampling point with primary shut-off valve
2
Multi-way ball valve
3
3/2-way ball valve
1)
4
Fine-control valve
5
Flowmeter with needle valve and alarm contact
6
2-way ball valve
1)
7
2-way ball valve
1)
8
Air filter
1)
9
Gas analyzer
10
Flowmeter without needle valve, with alarm contact
11
Purge gas cylinder with N
2
1)
12
Test gas cylinder with e.g. 2 ppm of O
2
in N
2
2)
13
Test gas cylinder with 8 ppm O
2
in N
2
1)
14
Pump
1)
15
Needle valve
1)
1) Option
2) A hard-mounted test gas cylinder is normally adequate.
The annual check of the reference point can also be carried out with
a non-stationary air supply.
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