Leak Testing - Emerson ROSEMOUNT Analytical NGA 2000 Instruction Manual

Instruction Manual
90002929
07/2006
14.

Leak Testing

The gas path system should be leak tested at least on a bimonthly basis and after maintenance,
replacement or repair of gas path parts.
Required tools
•
U-turn manometer for max. 500 hPa
•
Stop valve
Procedure
•
Connect the water filled u-turn manometer to the analyzer's sample gas output
(disconnect external gas lines).
•
Install the stop valve between gas input fitting and a Nitrogen (N
•
Open the stop valve until the internal gas path is under pressure of approx. 50 hPa
(corresponding to 500 mm water column)
•
Close the stop valve. After a short time for the water to balance the water level
must not change over a time period of approx. 5 minutes!
Note!
It is recommended to include external equipment (e.g. cooler, dust filters, etc.) into a leak
test!
Overpressure max. 500 hPa !
For differential measurement the leakage check must be performed for
measurement side and reference side separately !
Analyzers with parallel tubing require separate leak tests for each gas path!
Emerson Process Management GmbH & Co. OHG
Before opening gas paths they must be purged with ambient air or
neutral gas (N ) to avoid hazards caused by toxic, flammable,
2
explosive or harmful to health sample gas components!
Analyzer /
Analyzer Module
Valve
Water
Fig. 14-1: Leak Testing with an U - Tube - Manometer
NGA 2000 MLT Hardware
LEAK TESTING
Overpres-
sure
) supply.
2
14 - 1