YOKOGAWA FLXA21 User Manual

<Appendix 3 For ISC (Inductive Conductivity)>
App.3-1
IM 12A01A02-01E 8th Edition : Oct. 01, 2015-00
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 FLXA202/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

YOKOGAWA FLXA21 Specifications

General

Brand	YOKOGAWA
Model	FLXA21
Category	Measuring Instruments
Language	English