Leak-Checking The Analyzer - Emerson Daniel Danalyzer 1000 Hardware Reference Manual

SEP 2005
5.5.4.4

Leak-Checking the Analyzer

To perform a field-service leak check of the Analyzer, follow these steps:
(1) Plug all Analyzer vents.
(2) Make sure the setting of the regulator for the carrier gas cylinder is 115 pounds per square
inch, gauge (psig).
(3) Check all fittings at the pressure regulator flow panel and at the carrier cylinder regulator
with a leak detector. Correct any leaks detected by a bubble indication.
(4) Turn the carrier gas cylinder shut-off valve clockwise to close. Observe the carrier gas
pressure for 10 minutes to check for a drop in carrier pressure. The drop should be less than
200 psig on the high side of the regulator/gauge. If the carrier pressure remains constant, no
leaks are present.
(5) Actuate the VALVE ON/OFF switches and observe the pressure with the valves in different
positions than in step (4). (When the valves are switched, some pressure change is normal
because of carrier loss. Momentarily open cylinder valve to restore pressure if necessary.)
(6) If the pressure does not hold constant, check all valve fittings for tightness.
(7) Repeat step (5) again. If leaks persist, check the valve ports with a commercial leak detector
for helium or other carrier gas. Do not use a liquid leak detector on the valves or
components in the Analyzer oven (within the black insulated cover).
5-18
MODEL 1000
MAINTENANCE