Yokogawa 2-Wire Dual Channel Transmitter/Analyzer FLXA21 Manual de usuario descargar pdf (Pagina 127)

<10. COMMISSIONING OF ISC (Inductive Conductivity)>

10-4

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

l Process temperature compensation

SelectatemperaturecompensationmethodfromamongNone,TC,NaCl,andMatrix.“None”

does not perform the temperature compensation.

l TC

This method uses the linear compensation function.

Forhowtocalculateatemperaturecoefcientofthecompensationfunction,see“lCongure

calculatedtemperaturecoefcient(TC).”onpageApp.3-1.

l NaCl

ThismethodusesthestandardtemperaturecompensationfunctionwithNaClsolution.

For details, see “lNaClorstandardtemperaturecompensation”onpageApp.3-1.

l Matrix

Thismethodusesthetemperaturecompensationmatrix,whichisatableoftheconductivity

valuesatdifferenttemperaturesandconcentrationsforaspecicsolution.Themeasured

conductivityiscompensatedbasedonthismatrixtotheconductivityatthereference

temperature.

Preparedmatrixesanduser-denedmatrixescanbeused.Twodifferentuser-dened

matrixesareavailable.

For details, see “lMatrixcompensation”onpageApp.3-3.

When the measured temperature or the precompensated conductivity is out of the range, the

temperature compensation error (warning) will be issued. This is not a device error.

Formoredetails,see“■Temperaturecompensationerror”onApp.3-8.

Any two of these three methods can be set for conductivity measurement as “Temp.comp.1” and

“Temp.comp.2”. The result of either method can be output or displayed (see “10.2 Output setup”

or“10.6Displaysetup”).

When “Measurement” is set to “Conduct. + Concentr.” for the Measurement, only one method

can be set.

NOTE

The temperature compensation is not performed around zero. In this case, a warning may be

issued.

10.1.5 Calibration settings

Thescreenowdiffersdependingonthecombinationofobjectstobemeasured.

l Air adjust limit

Generally,aircalibrationisnotrequired.Toavoidtheeffectsofthecableonthemeasurementof

lower conductivities such as pure water, a “zero” calibration with a dry sensor may be done.

Perform a zero-calibration using a dry sensor to prevent the cable from affecting the

measurement.Ifaterminalbox(BA20)andextensioncable(WF10)areused,performthezero-

calibration while they are connected.

Asthecalibrationisperformedinair,theresistivityisinnite(openconnection).Higher

conductivity values than the air adjust limit indicate that the cell is not in air or is still wet. To

prevent wrong air calibrations, a limit must be given here.

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