7. Maintenance
DEPOLOX® 400 M
78
EN
Fig. 2
Filter unit cross-section
A Knurled nut
B
O-ring
C
Fine filter
7.7 Cleaning the flow rate monitor
and non-return ball valve
1 Switch off the power supply.
2 Drain the sample water inlet and outlet
line.
3 Remove the housing cover of the flow
cell.
4 Release both knurled nuts. Take out the
filter unit toward the front.
5 Carefully pull the complete check valve
housing (A) down and out.
6 Turn the check valve housing upside down
and catch the flow ball (B) or if the ball is
jammed, release it with a slight knock.
7 Use a suitable blunt tool to push out the
ball seat (C) and glass ball (D) against the
direction of flow.
8 Clean the empty check valve housing,
flow ball, ball seat and glass ball with clear
water.
9 To help push the assembled check valve
housing back into the control valve, we
recommend slightly lubricating the gas-
kets with the Unisilikon grease provided.
10 Check that the check valve housing is cor-
rectly positioned by the guide lugs on the
housing.
11 Fit the filter unit again. To do this, tighten
the knurled nuts.
12 Fit and engage the housing cover of the
flow cell.
13 Open the ball valves on the sample water
supply and drainage line again.
14 Switch on the power supply.
Fig. 3
Cross-section, installation position
check valve housing - DEPOLOX® 5 C
flow cell
Fig. 4
Cross-section model, filter unit
A Check valve housing (overall view)
B
Flow ball
C
Ball seat
D Glass ball
NOTICE
During reassembly make sure that the ball
seat and ball are correctly positioned
(Fig. 4).
A
B
C
A
bottom
top
A
top
buttom
B
C
D
