YOKOGAWA FC400G, User Manual, Page: 58 / 91

< 6. Operation >
6-9
IM 12F5A1-01E
• Washing Time Setting (when *T. ON is selected)
Set washing time *WT.min in the range of 0.1 to 25.0 min. The washing time is set to 1.0 min at
factory shipment.
• Releasing Time Setting (when *T. ON is selected)
Set releasing time *RT.min (time required for eliminating the effects of washing solution) in the
range of 0.1 to 25.0 min. The releasing time is set to 5.0 min at factory shipment.
Note: Contact output status during washing is as shown below
F6-1e.ai
Output hold
T1 : Washing interval
T2 : Washing time
T3 : Releasing time
*1 WASH/CAL lamp blinks (5.2 Display Content on the Display Unit 
) and W1, W2 of Figure 3.4 are operated.
Contact output for
washing

Contact output for
Wash/Auto zero
calibration *1
OFF
OFF
ON
ON
T2 T3
OFF
OFF
ON
ON
OFF
T2 T3
T1
Auto zero calibration (<*AZ. CAL > Mode) (refer to Sec. 7.2.3)
• Auto zero calibration timer ON /OFF setting
Select *T.OFF if you don’t want to use this timer, otherwise select *T. ON.
• Auto zero calibration interval setting (effective when *T. ON)
Set Auto zero calibration interval using *INT D to between 0.1 and 99.9 days.
10.0 is the shipping-time default setting.
• Calibration setup time setting (effective when *T. ON)
Set Calibration setup time using *WT.min to between 1 and 100 minutes.
10 is the shipping-time default setting.
• Stabilization (settling) setup time setting (effective when *T. ON)
Set Stabilization (settling) setup time using *RT.min to between 1 and 100 minutes.
10 is the shipping-time default setting.
Optimum values for these time settings depend on sample and measurement environment.
When setting auto zero calibration parameters, zero filter flushing function will be activated by
supplying zero water once in 24 hours to protect the corrosive of the activated charcoal filter. The
measured value is held, HOLD lights, and “FLUSH” (blinking) is displayed.
(1) Auto zero calibration is selected,
(2) Auto zero calibration timer is turned ON,
(3) Auto zero calibration interval needs to be one day (24 hours) or longer. (refer to Sec. 7.2.2)
(d) Plateau Measurement (<* PLAT> Mode)
Set the initial applied voltage, Step applied-voltage, and step count, then give a running
command. This causes the voltage corresponding to the setting parameters to be applied in turn,
allowing collection of the plateau characteristic (voltage to current characteristic). The plateau
characteristic obtained can be used as guidance for determining electrode abnormality or the
degree of deterioration.
Note: The applied voltage changes during acquisition of the plateau characteristic. Therefore, when output hold has been
canceled (pressing the
YES
key with *HLD.OF displayed for <*SET.HD> in item (2), Sec. 5.4.2), output changes in
accordance with the set output range.
Utilizing this feature, changes in the free chlorine concentration value can be replaced by the status of current change to
be output, for example, to a recorder. The output range must be set to an appropriate level in accordance with the plateau
characteristics.
(Output of all changes may not be available depending on the applied voltage setting range.)