YOKOGAWA FC400G, Руководство пользователя, Страница: 51 / 91

< 6. Operation >
6-2
IM 12F5A1-01E
6.1.3 Supplying Sample Water
Before starting to supply water to be measured, confirm that the needle valves in the FC400G and the
sampling system are closed. When it’s difficult to view the liquid surface in the measuring tank from
outside, check the tank when it’s time for electrode maintenance ( refer to Figure 6.3 ).
(1) When there is no Sampling System
The sample supply pressure to the FC400G should be 1 to 150 kPa, and flow should be 0.1 to
2.5 l/min.
Next, slowly open the needle valve of the FC400G to adjust the water flow.
• The water should flow continuously along the whole length of the electrode , from the tip to
where it enters the water ( minimum flow 0.1 l/min. )
• Liquid flow should not be such that water splashes on the base of the electrode (maximum
flow 2.5 l/ min. ) Check that there is no leakage from the piping or from the breather hole of the
tank.
(2) When the FC400G is used with ST401G Sampling System.
The sample supply pressure should be 100 to 750 kPa, and flow should be 0.1 to 10 l/min. Adjust
flow using needle valve as described in (1) above.
(Note) Refer to the Instruction Manual IM12A0V2-E of the ST401G Sampling System.
6.1.4 Polishing the Indicator Electrode
The electrode surface of the indicator electrode must always be kept clean. Polish the electrode
surface as follows:
(1) Press the
MODE
key on the converter to enter the operation level and press the
YES NO
key to select the <CELL> mode (cell motor ON / OFF). Press the
NO
key with respect to the
message “CELL ON” displayed to stop the rotation of the indicator electrode.
When the electrode stops rotating, the CELL lamp extinguishes.
Remove the electrode mechanism block from the measuring tank and set up the block as shown
in Figure 6.3. The electrode mechanism block is fixed to the measuring tank using two screws at
the lower part of the mechanism block.
F6.2e.ai
Fixing screws
(2 pcs)
Electrode
mechanism block
F6.3e.ai
Electrode mechanism
block cover
Figure 6.2 Electrode Mechanism Figure 6.3 Under Maintenance
Block Fixing Screws