7 Maintenance
92
7.4
Cleaning of Sampling Unit
Here describes the cleaning method of the sampling unit.
Perform cleaning periodically to remove contamination and sludge etc.
7.4.1
Cleaning of Overflow Tank and Measuring Tank
1.
Turn ON the maintenance switch of the control unit and stop the supply of sample
water.
2.
Turn OFF the power switch.
Open the lid of overflow tank. Remove the analyzer unit from the measuring tank.
Note
When removing the analyzer unit from the measuring tank, take care not to damage the cell unit. In
addition, put the analyzer unit on the calibration tank with solution (sample water or tap water) so that
it does not idle.
3.
Set the valves, (V-1), (V-2), and (V-3) which are on the lower part of overflow tank,
and the valve (V-4) on the lower part of measuring tank to fully open. If the supply of
sample water cannot be stopped, set the valve (V-1) to close and clean all except V-
1.
Reference
"9.2 Piping Flow Chart" (page 104).
4.
Remove the inner tank of measuring tank.
Reference
"7.4.2 Removal of Inner Tank of Measuring Tank" (page 93).
5.
Remove the sludge from the overflow tank and measuring tank, and clean the
inside with tap water etc. If the flow from the overflow tank to measuring tank is
partially clogged, remove the piping of measuring tank and clean the inside of
piping with tap water.
6.
After cleaning the overflow tank, measuring tank, inner tank of measuring tank, and
piping, set back to the original condition.
7.
Set the valves (V-1) and (V-4) to fully close, and (V-2) and (V-3) to fully open.
8.
Supply the sample water. Open valve (V-1) gradually until sample water runs out of
the overflow outlet (1) of the overflow tank. If the sample water does not run out of
the overflow outlet (1) even when the valve (V-1) is fully open, then close valve (V-2)
gradually to adjust the flow from the overflow outlet (1).
9.
Ensure that sample water overflows from the upper notches (2) of the inner tank of
measuring tank and is discharged from the drain outlet.
10.
When outlet flow from the overflow tank and the inner tank of measuring tank
reaches the designated volume and is running stably, put the lid of overflow tank
back on.
Inner tank of measuring tank
