Yokogawa 2-Wire Dual Channel Transmitter/Analyzer FLXA21 Manual de usuario descargar pdf (Pagina 137)

<11. CALIBRATION OF ISC (Inductive Conductivity)>

11-2

IM 12A01A02-01E 5th Edition : Oct. 31, 2013-00

NOTE

The standard instrument to be used in calibration with a process solution should always be

accurate. Yokogawa recommends that the Model SC72 pocket conductivity meter be used for

this purpose.

Where temperature compensation 1 (SC1) and temperature compensation 2 (SC2) have been

congured,theconguredtemperaturecompensationiseffectiveevenduringcalibration.

Therefore, the reading is the value converted to a conductivity value at the reference temperature

set in Temperature settings.

There are temperature compensation 1 (SC1) and temperature compensation 2 (SC2), but this

doesnotmeanthatcalibrationisrequiredtwice.ItmeansthateitherSC1orSC2temperature

compensation should be selected and calibration should be made once to obtain the cell

constant.ThecellconstantaftercalibrationcanbecheckedontheDetailscreen.

NOTE

Whenasensorisexchangedorreplaced,sensorwellnessdatashouldbereset.

When a sensor is replaced, the replacement can be recorded manually into a logbook. (Refer to

thegure9.8.)

l Cell constant

The center value of the cell constant of the ISC40 sensor is 1.88 cm

-1

. The nominal cell constants

of individual sensors are indicated on the cable markers and the actual installation can change

this factor. If there is less than 30 mm spacing between a sensor and holder, in-situ calibration is

necessarytomeetthespeciedaccuracies.

• If the sensor is installed in the stainless steel standard holder ISC40FFJ-S, the cell constant

isreducedbyapproximately7%;enteravalue7%smallerthanthevalueonthemarkerof

the sensor cable.

• If the sensor is installed in the polypropylene standard holder ISC40FFJ-P, the cell constant

isincreasedbyapproximately1%;enteravalue1%greaterthanthevalueonthesensor

cable marker.

• Ifthesensorisinstalledinpipingthatislongintheaxialdirectionwiththecrosssection

as shown in Figure 11.3, the cell constant of the sensor installed in the piping (reference

data for a design center value of 1.88 cm

-1

) is as shown in Figure 11.3. A value obtained by

multiplying the value on the sensor cable marker and a value read from Figure 11.3 should

be entered.

X= 30 mm (Min.)

Figure 11.2 Sensor in calibration solution

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Yokogawa 2-Wire Dual Channel Transmitter/Analyzer FLXA21 Manual de usuario Pagina 137