26
SCC-F Sample gas feed unit Operator’s manual
42/23-51 EN Rev. 3
Replacing the dosing pump pressure rollers and springs
When do the pressure
rollers and springs
need to be replaced?
The pressure rollers in the dosing pump must be replaced when their surface is
damaged.
The pressure springs in the dosing pump must be replaced when they are broken.
Replace pressure
rollers and springs
(see Figure 9)
Step Action
1
Stop the sample gas supply and shut off the sample gas feed
unit power supply.
Remove the hose:
2
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; then remove the
moving belt and hose from the pump head.
Dismantle the pump head:
3
Unscrew the two nuts
3
that secure the pump head (spanner size 5.5).
4
Pull the pump head
4
off the roller bearing axle, and remove the roller
mounting
5
from the pump head.
Replace pressure rollers and springs:
5
Pull the pressure springs
6
out of the hole in the roller mounting
5
and
out of the retaining slot in the roller axle
7
. Remove the roller axle from
the roller mounting, and pull the pressure roller
8
off the roller axle.
6
Push the new pressure roller
8
onto the roller axle
7
and secure with
new pressure springs
6
in the roller mounting
5
.
Fit the pump head:
7
Insert the roller mounting
5
in the pump head
4
, and push both com-
ponents together onto the roller mounting axle. During this process,
check to ensure that the roller mounting axle and roller mounting fit
together properly.
8
Secure the pump head
4
with the two nuts
3
.
It is expedient to open the front panel forwards: this enables the
pump’s base plate with the fastening screws to be secured from
inside.
Refit the hose:
9
Insert moving belt
1
with the hose in the pump head; using the han-
dles, press the moving belt together while at the same time turning the
S-clip
2
counterclockwise until it engages.
Start the sample gas feed unit again:
10
Switch on power supply to sample gas feed unit.
11
The sample gas flow should only be restarted after the lead time
period.
Continued on next page
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