Sun Microsystems DGA 5000 - 9.3 Leak Check (Gas)

• If the leak check is unsuccessful, check all filter and hose connections
for tightness and ensure that the sample hose is not damaged.
Repeat the Leak Check (Vacuum). Refer to 9.6.3: „Sample Probe
and Hose‟) for information on how to isolate possible leaks in the
sampling system (Probe, Hose and Gas Filter).
• If a satisfactory result is still not obtained, and the sample hose and
connections are in order, conduct a Leak Check (Gas) (see below,
9.3: „Leak Check (Gas)‟) to eliminate the possibility that a leak in the
gas module water circuit is influencing the result of the Leak Check
(Vacuum).
9.3 Leak Check (Gas)
The Leak Check (Gas) tests for gas/air leaks in the pneumatic system of
the gas analyser but is not influenced by leaks occurring in the gas
module water circuit. Since leaks in the water circuit do not compromise
measurement accuracy, a successful Leak Check (Gas) is considered to
fulfill the requirement for a daily leak check even if a previous Leak
Check (Vacuum) has been unsuccessful (see 6.3: „Daily Leak Check‟).
Note:
It will be apparent that a successful Leak Check (Gas) following an
unsuccessful Leak Check (Vacuum) indicates an internal leak in the gas
module water circuit. Although measurements will not be blocked and
normal unit operation may continue, contact your SUN dealer or Service
Representative to arrange for water circuit service.
To conduct a Leak Check (Gas):
• Select the “Leak Check (Gas)” from the Gas Analyser Maintenance
Menu (see 5.3).
• The Leak Check (Gas) screen will be displayed instructing the
operator to inset the sample probe in the vehicle tail pipe and showing
the current measured level of CO2.
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