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Chapter 4
Replacing the dosing pump hose
When does the hose
need to be replaced?
Replace dosing pump
hose
(see Figure 8)
24
Maintenance
CAUTION!
The operations described in this chapter require specialized knowledge, and
sometimes involve the necessity of working on the sample gas feed unit with
its cover open and live. They must therefore only be carried out by qualified
and specially trained persons.
WARNING EXPLOSION HAZARD!
Substitution of components may impair suitability for Class I, Division 2.
Do not disconnect equipment unless power has been switched off or the area
is known to be non-hazardous.
I/O connectors must only be connected to Class 2 circuits.
Depending on the operating cycle, the dosing pump hose should be replaced at
least every 5 months.
CAUTION!
Never lubricate the dosing pump hose.
The hose can contain acid residue. These materials can flow out when the
hose connections are opened. Take appropriate measures where needed to
collect residual acid. Appropriate precautions should be taken, and relevant
regulations on disposal should be complied with.
Step
Action
1
Stop the sample gas supply and shut off the sample gas feed
unit power supply.
Remove the old hose:
2
Loosen the hoses from the hose connections 4.
3
Using the handles, press the moving belt 1 together and turn the S-clip
2 in a clockwise direction as far as its limit stop.
4
Remove the moving belt 1 from the pump head and pull the old hose 3
by the hose connections 4 to release it from the moving belt's guides.
5
Press the pressure rollers 5 together and check the spring pressure; if
it is too weak, then the pressure springs and possibly rollers should be
replaced (see page 26).
SCC-F Sample gas feed unit Operator's manual
Continued on next page
42/23-51 EN Rev. 3
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