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6-12

IM 12F5A1-01E

(5) Code 07: Setting Applied-voltage Compensation Parameters (*DRV V Mode )

In the free available chlorine analyzer, optimum applied-voltage value changes in proportion to

thedi󰀨usioncurrentvalueasshownintheplateaucharacteristicinFigure6.8.

Thisrequiresapplied-voltagecompensationbemadeasexpressedbythefollowingequation.

(Appliedvoltage)=(DRVV)+(V/µA)x(di󰀨usioncurrentvalue)

DRV V

V / µA

F6.8e.ai

Current

Optimum

applied-voltage

Applied

voltage

Figure6.8 PlateauCharacteristicoftheFreeAvailableChlorineAnalyzer

• Setting *DRV V (Start Applied-voltage Value)

Set start applied-voltage value (*DRV V) in the range of -1.50 to 1.50 V. This parameter is set to

-0.10 V at factory shipment.

Setto+0.1Vin(todecreaseinuenceof)combinedchlorineinsensitiveversion(option).

•Setting*V/µA(SlopeValue)

Set the slope value, or applied voltage change(V/µA)per1µA,intherangeof-0.10to0.00

V/µA.Thisparameterissetto-0.02V/µAatfactoryshipment.Set to -0.01V/µA in (to decrease

inuenceof)combinedchlorineinsensitiveversion(option).

(6) Code08: SelectingElectrodeSensitivityInitializationON/OFF(*CHANGMode)

Set this parameter to “ 1 ” only if you wish to rewrite the slope (“ SL ”) displayed in the message

area selectable in the operation level <DISP> mode, to 1.00 (e.g., for electrode replacement).

Generally set this parameter to “ 0 ”. This allows the sensitivity relative to the sensitivity reached

when the parameter is rewritten to 1.00, to be checked using “ SL ”.

This parameter is set to “ 0 ” (initialization OFF) at factory shipment.

(7) Code 09: Washing / Auto zero calibration selection (*WA / CA Mode)

Selects either washing or auto zero calibration

For washing, select “ 0 ”, and for auto zero calibration, select “ 1 ”. Shipping-time default is “ 0 ”.

(8) Code 10: Remote range switching ON / OFF (*R.RNGE Mode)

Wheninputexceedsapresetvoltage,therangeisswitched(Rangecanbechanged).

Set “ 1 ” (ON) to enable remote range switching. Shipping-time default is “ 0 ” OFF, disabled.

YOKOGAWA FC400G User Manual

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