Service Procedures - Siemens Maxum II PD PA AP Service Manual

Valves
4.2 Liquid Injection Valve
Fault
The space between the stem (6) and the inside
wall of the vaporizer (16) is filled by deposits.
This can block the supply of carrier gas.
In extreme cases deposits may result on the
stem (6).
Brown deposits are present on the vaporizer
gasket (14) at the outlet to the vaporization area.
4.2.4

Service Procedures

Overview
These procedures refer to the Liquid Injection Valve Component Locations (Page 38)
illustrations.
Temperature and Heating Components in Explosion Proof analyzers
If the heating assembly is removed, exchanged or retrofitted, the assembly must be tested
and certified in accordance with appropriate regulations before the analyzer can be placed
back in service.
Removing the Valve
Perform the following procedure to remove the valve from the oven. Removing the vaporizer
(16) and flange (17) is optional when removing the valve.
Potential burn hazard. Handling hot components may result in personal injury.
To prevent injury from burns always switch off the oven and valve heaters and allow the oven
and liquid injection valve to cool down before touching the valve.
Procedure
1. Switch off oven and valve heaters and allow oven and valve to cool down.
2. Switch off sample flow at the sample conditioning system and allow sample line to empty.
3. Shut off power to the chromatograph.
4. Shut off carrier gas and control air supplies.
Note
Before doing the next step, purge the sample line including the valve with Nitrogen to avoid
exposure to hazardous substances.
40
Causes
The sample contains dissolved salts
and other nonvolatile materials.
CAUTION
CAUTION
Remedy
The deposits in the vaporizer (16)
may be removed mechanically (drill/
ream with 3.3 mm diameter), or the
part may be replaced.
Maxum II Valves and Oven Components
Service Manual, 10/2018, A5E42019844001