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Instruction Manual
HAS60E-IM-HW
June 2007
NGA 2000 CLD
4 - 7Maintenance and ServiceEmerson Process Management GmbH & Co.OHG
4-8 LEAKAGE TEST
The gas path system should be leak tested at least twice
a year and after maintenance, replacement or repair of
gas path parts.
a) Required Tools
• Test Medium
• external Manometer
• Swagelok
®
Blind Unions (2)
Figure 4-4: Principle Leakage Test Assembly
Table 4-1: Leakage Test Specifications
b) Procedure
To perform aleakage testing, proceed as follows (see
figure 4-4):
1. Close sample and ozonator air supply
2. Disconnect the gas connections
3. Close sample inlet and ozonator inlet with blind
unions
4. Connect a pressure meter to the exhaust fitting
5. Connect test medium supply (N
2
or He) to the pres-
sure meter
6. Supply Analyzer Module with the test medium with
a pressure of approx. 2,000 hPa (15 psig) and close
supply .
Since CLD internal it comes to equalization of pres-
sure, supply is to open and to close repeatedly
until manometer doesn’t show pressure changes.
7. Watch the manometer.
Over a period of about 15 minutes the pressure
drop may not be higher than 7.5 hPa/min. using
Helium (He) or 2.5 hPa/min. using Nitrogen (N
2
)
If the specifications (see table 4-1) were adhered to, then
the test is finished.
Test Medium Nitrogen (N
2
) Helium (He)
Test Pressure
15 psig / 2,000 hPa / 1 bar 15 psig / 2,000 hPa / 1 bar
Test Time
15 min 15 min
permissible
Drop in Pressure
2.5 hPa / min 7.5 hPa / min
Ozonator Air
Exhaust
Sample
Closed Gas Connections
CLD Analyzer Module
Gas source with
test medium
N
2
or
He
P
External Manometer:
15 psig = 1,000 hPa