M20Ht Safety And Certification Information; M20Ht Procedure - Overview; M20Ht Procedure - Maintenance Facility - Siemens Maxum II PD PA AP Service Manual

4.5.3

M20HT Safety and Certification Information

This procedure is not likely to directly impact the safety systems of the analyzer. However,
care must be exercised at all times when working with the analyzer. Since the valve is located
in the oven of the Maxum II, appropriate care must be taken to ensure that the environment is
safe to perform the work.
Maintenance work on the Maxum II analyzer should only be performed when the area is known
to be safe for the work to be done.
NOTICE
Obtain appropriate permits.
This procedure must only be executed with the consent and approval of all applicable local
safety personnel and/or the local authority having jurisdiction.
4.5.4

M20HT Procedure - Overview

Throughout this procedure there are steps that instruct the user to inspect the valve to
determine whether additional disassembly is necessary. This is to prevent unnecessary effort
and to prevent the possibility of damaging the valve through further disassembly.
4.5.5

M20HT Procedure - Maintenance Facility

When cleaning the valve and associated components, it is imperative that the maintenance
be performed in a clean and contaminant free facility. Components should be placed on a lint
free cloth to prevent impurities from contaminating the valve and/or components. Hands should
be clean and free of contaminants.
Presence of any foreign contamination can cause additional valve problems after reinstallation.
All foreign contamination adhering to valve must be removed quickly using a dust/lint free cloth
and a cleaning solvent such as hexane. After cleaning valve cap and tubing, shake excess
cleaning fluid from tubes and let valve cap air dry before reassembling.
NOTICE
Do not allow polished face of valve cap to rest on any surface other than a lint free cloth.
Clean metal parts using a syringe or ultrasonic cleaner and an appropriate cleaning solution
as described in this procedure.
Maxum II Valves and Oven Components
Service Manual, 10/2018, A5E42019844001
Valves
4.5 Model 20 HT Valve
69