GE Analytical Instruments ©2016 227 of 270 DLM 68100-09 EN Rev. A
Chapter 9: Troubleshooting
To perform the (Check 1) Gas Manifold Leak Check
This test checks for leaks in the gas lines between valves V1-GD and V7-SH, V1-R, and V2-R. It also checks for
leaks in the NDIR end caps and vent gas line. This flow path is highlighted in Figure 101 on page 229
.
1. Verify that the Analyzer is set with the correct PID setting, as described in “
Gas Valve PID Parameters” on
page 167.
2. Ensure that the NDIR is plugged, as described in the Before You Begin section.
3. On the Diagnostics screen (Maintenance
Diagnostics), press the Gas Leak button to display the Gas
Leak Check screen (Figure 100
). The pressure reading at the Pressure Sensor PS4-GS and a timer [initially
is set to 00:00 (min:sec)] appear.
Figure 100: The Gas Leak Check Screen
4. Press the Gas Manifold button to start the test. The Analyzer closes the following valves: V1-R, V2-R,
V4
-R, V5-R, and V7-SH. The Analyzer opens valves V7-R, V6-R, and V3-R.
The Gas Control Module pressurizes the lines for 24 sec., and then valve V1-GD closes to trap that
pressure in the area being tested and the system holds for an additional 15 sec. If a major leak is
detected at this time, an “Analyzer failed to pressurize” warning will appear and the test will end. During
this 39-sec. pressurization period, the timer remains at 00:00 and “Pressurizing . . .” appears under the
timer.
5. When the system passes pressurization, the leak check begins, the timer starts, and “Testing . . .”
appears under the timer. The test passes if the drop in pressure is <= 2.0 psi.
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