ACOEM Met One Instruments GAS-1060, Руководство пользователя

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Service Page 111
12. Toggle Off - Internal Pump

Off .
13. Note the value on the barometer. Wait for three minutes, the value should not drop more than 5
kpa (37.5 torr). If the leak check passed skip to step 16.
14. Inspect the instrument’s plumbing looking for obvious damage. Check the condition of fittings
and sample filter holder seating plus condition of the O-ring.
15. If the leak is still present divide up the pneumatic system into discrete sections to locate the leak
(refer to Section 7). When the location of the leak has been determined repair and then rerun the
leak check procedure.
16. Slowly remove the barometer from the Sample Port and allow the instrument to return to
ambient. Inspect the internal tubing to ensuring that the tubing is cleanly connected to the
fittings and that the internal Teflon lining has not been kinked or crumpled.
17. Open - Main Menu

Service Menu

Diagnostics Menu

Valve Menu .
18. Enable - Valve Sequencing

Enabled .
19. Open - Main Menu

Service Menu

Diagnostics Menu

Internal Pump Menu .
20. Select - Flow Control

Start - Accept.
6.3.7 Clean Pneumatics
The calibration valve manifold will require disassembling and cleaning. Ideally the valves and the
manifold should be cleaned in a sonic bath with lab detergent and water. Once clean rinse with
distilled water and dry before reassembling (refer to Section 9.8 and Section 9.9). Leak test the
assembly before adding back into the system. Once the system has been reassembled the instrument
should have a full system leak check (refer to Section 6.3.6).
If the tubing shows signs of significant contamination, it should be replaced with new tubing.
6.3.8 Pressure Sensor Check
Pressure checks are needed to ensure that the pressure sensor is accurately measuring pressure
inside the instrument.
During normal operation ensure that the Pressure & Flow Menu indicate the following parameters.
Ambient should display the current ambient pressure at site. Cell should indicate current
measurement cell pressure depending on the pump condition and location. A Cell pressure of
between 10 torr and 50 torr is recommended.
Equipment Required

Barometer

Digital Multimeter (DMM)
Procedure
1. Open - Main Menu

Analyser State Menu

Pressure & Flow Menu .