YOKOGAWA FC400G, Руководство пользователя, Страница: 53 / 91

< 6. Operation >
6-4
IM 12F5A1-01E
6.1.6 Checking Electrode Mechanism Block
Check as follows that the electrode rotates normally. Put the electrode in the maintenance position
(Figure 6.3) or lift the cover, and check the following:
• There should be only a slight sound from the belt or axles when the electrode rotates.
There should not be any sound like items making contact or vibrating.
• There should be no unevenness or vibration.
• The drive belt should not be visibly loose, resulting in a loss of traction.
Replace the electrode mechanism block in the measuring tank after confirming that there are no
problems.
After replacing the electrode mechanism block in the tank, attach the cover. Stop the rotation of the
electrode. Switch the converter to <CELL> mode (display CELL. ON and press
NO
key to stop cell
motor and thus electrode rotation.
Mount electrode mechanism block on measuring tank, and tighten fixing screws sufficiently. Then
press
YES
in CELL mode to start electrode rotation. When the indicator electrode is rotating
(cell motor power is supplied from converter) then “CELL” is displayed on CONTACTS
display of converter panel.
6.1.7 Filling Zero Water, and Test Operation
For auto zero calibration to proceed smoothly, you need to flow zero water (chlorine-free water)
through the zero filter case before starting, then attach zero filter and operate without turning on auto
calibration.
After replacing the filter, or when the normal calibration interval has been exceeded, you needs to run
the instrument in offline mode for a while to allow conditions to stabilize before turning on the Auto
Zero Calibration functions.
• Close BV2 and open BV3 ball valve.
• Be careful that water does not leak from activated charcoal filter F1 or piping, and that there are
no bubbles is pipeline.
• After 20 min. operation like this, confirm that residual chlorine reading is near zero.
Set auto zero interval, warm up time, and settling time according to the environment.
• Close BV3 and BV2 ball valve.
6.1.8 Setting Operation Parameters
When the FC400G Free Available Chlorine Analyzer arrives at your site, it will operate based on the
initial data set at the time of shipment.
Set the appropriate parameters to suit your operation conditions. Refer to Sec. 6.3 for the types and
operations of setting parameters. Key operations for displaying the setting mode items and setting
data are described in Chapter 5.
6.1.9 Calibration
Operate the FC400G for at least one hour under normal operating conditions before calibrating.
(Note) The electrode characteristics are not stable immediately after cleaning the electrode, this is the reason for leaving the instrument
running for a while before calibrating it.
Refer to Chapter 7 for calibration requirements.