ABB EasyLine Series Instructions For Installation Start-Up And Operation page 27

Example of sample conditioning
1 Sampling point with primary shut-off valve
2 Multi-way ball valve
3 3/2-way ball valve
4 Fine-control valve
5 Flowmeter with needle valve and alarm contact
1)
2-way ball valve
6
1)
2-way ball valve
7
1)
8 Air filter
9 Gas analyzer
10 Flowmeter without needle valve, with alarm contact
Purge gas cylinder with N
11
12 Test gas cylinder with e.g. 2 ppm of O
13 Test gas cylinder with 8 ppm O
1)
14 Pump
1)
15 Needle valve
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.
Preparation for Installation
1)
1)
2
in N
2
1)
in N
2 2
2)
2
27