Yokogawa 2-Wire Dual Channel Transmitter/Analyzer FLXA21 Manual do Utilizador descarregar pdf (Página 229)

App.3-1

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

Appendix 3

For ISC (Inductive Conductivity)

n Temperature compensation

The conductivity of a solution is very dependent on temperature. Typically for every 1°C

changeintemperaturethesolutionconductivitywillchangebyapproximately2%.Theeffectof

temperature varies from one solution to another and is determined by several factors like solution

composition,concentrationandtemperaturerange.Acoefcient(α)isintroducedtoexpressthe

amountoftemperatureinuencein%changeinconductivity/°C.Inalmostallapplicationsthis

temperatureinuencemustbecompensatedbeforetheconductivityreadingcanbeinterpreted

as an accurate measure of concentration or purity.

l NaCl (standard temperature compensation)

The FLXA21 has the default temperature compensation function based on a sodium chloride

(NaCl)solution.Thisfunctioncanbeusedforvariousapplicationsandiscompatiblewiththe

NaClcompensationfunctionoftypicallaboratoryorportableinstruments.

Table 1 NaCl compensation according to IEC 60746-3 with Tref. = 25°C

Temperature

(°C)

Ratio*

Temperature compensa-

tioncoefcient(%/°C)

Temperature

(°C)

Ratio*

Temperature compensa-

tioncoefcient(%/°C)

0 0.54 1.8 100 2.68 2.2

10 0.72 1.9 110 2.90 2.2

20 0.90 2.0 120 3.12 2.2

25 1.00 — 130 3.34 2.2

30 1.10 2.0 140 3.56 2.2

40 1.31 2.0 150 3.79 2.2

50 1.53 2.1 160 4.03 2.2

60 1.76 2.2 170 4.23 2.2

70 1.99 2.2 180 4.42 2.2

80 2.22 2.2 190 4.61 2.2

90 2.45 2.2 200 4.78 2.2

*: Theratiooftheconductivityatrespectivetemperaturestotheconductivityatthereferencetemperature.

l Temperaturecompensationcoefcient(TC)

Setthetemperaturecompensationcoefcientbasedonthedegreeofinuenceoftemperature

on the conductivity (%/°C).

Ifthetemperaturecompensationcoefcientofthesamplesolutionisknownfromlaboratory

experimentsorhasbeenpreviouslydetermined,enterthevalue.

Thesettingrangeisbetween0.00and10.0%.Bycombiningwiththereferencetemperature

setting, a linear compensation function can be obtained. This is applicable to all kinds of chemical

solution.

<Congurecalculatedtemperaturecoefcient(TC).>

Follow routing

Commissioning>>Measurementsetup>>Temp.compensation>>T.C.

Enterthetemperaturecoefcientcalculatedfromthefollowingformula:

App.

ISC

1 2 ... 224 225 226 227 228 229 230 231 232 233 234 ... 245 246

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