U
NPACKING AND
I
NSTALLATION
748250-L Rosemount Analytical October 1999
2-5
Model 880A Non-Dispersive Infrared Analyzer
WARNING: POSSIBLE EXPLOSION HAZARD
2.8 LEAK TEST PROCEDURE
To check for leaks in the sample system, do the following:
1. Supply air or inert gas such as nitrogen to the sample inlet of the analyzer at 10
psig (69 kPa).
2. Seal off sample outlet with a cap, and turn off supply of inert gas. After 1 hour,
pressure reading should not drop. If it does, the system is leaking. Continue with
steps 3 thorough 4 to locate source of leak.
3. Use a suitable test liquid such as SNOOP (P/N 837801) to detect leaks. Cover all
fittings, seals or possible leak sources.
4. Check for bubbling or foaming which indicates leakage and repair as required. Any
leakage must be corrected before introduction of sample and/or application of
electrical power.
5. For smaller leaks, use a Halogen or helium leak detection device.
This analyzer is of a type capable of analyzing sample gases which may be
flammable. If used for analysis of such gases the instrument must be protected
by a continuous dilution purge system in accordance with Standard ANSI/NFPA
496-1989, Chapter 8.
If explosive gases are introduced into this analyzer, the sample containment
system must be carefully leak-checked upon installation and before initial
startup, during routine maintenance and any time the integrity of the sample
containment system is broken, to ensure the system is in leak-proof condition.
Leak-check instructions are provided in this section.
Internal leaks resulting from failure to observe these precautions could result in
an explosion causing death, personal injury or property damage.
Note
Apply test liquid to cell or detectors and IR source windows only as a last
resort. Should this occur, follow instructions in Section 6.1 to clean these
components.
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