YOKOGAWA FLXA21 User Manual

<Appendix 3 For ISC (Inductive Conductivity)>
App.3-3
IM 12A01A02-01E 8th Edition : Oct. 01, 2015-00
<Calculation example>
Calculate the temperature coefcient of a liquid from the following data.
Conductivity 124.5 µS/cm at a liquid temperature of 18.0 °C and a conductivity 147.6 µS/cm
at a liquid temperature of 31.0 °C.
Substituting the data in the above formula gives the following result.
147.6 - 124.5
x 100= 1.298 %/°C
α =
124.5x(31.0 - 25) - 147.6x(18.0 - 25)
Set the temperature coefcient in the FLXA202/FLXA21 converter.
When the temperature coefcient already set is accurate, the conductivity to be displayed
must be constant regardless of liquid temperature. The following check will make sure that the
temperature coefcient already set is accurate.
If, when the liquid temperature is lowered, a larger conductivity value is indicated, the
temperature coefcient already set is too small.
The opposite also applies. If a smaller conductivity value is indicated, the temperature coefcient
already set is too large. In either case, change the temperature coefcient so that the conductivity
no longer changes.
l Matrix
Matrix means temperature compensation with the temperature compensation matrix.
The temperature compensation matrix is a table of conductivity values at different temperatures
and concentrations.
Ready-made matrixes and user-dened matrixes are available.
<Ready-made matrixes>
Ready-made temperature compensation matrixes are available for common inorganic acids and
bases. Those for ammonia and morpholine are also available.
Table 2 Ready-made temperature compensation matrixes
Matrix
Compound to
be measured
Concentration
Temp. compensation
range
Details
Sulfunic acid 1..5%
H
2
SO
4
1 to 5% 0 to 100˚C
Table A
Sulfunic acid 1..27%
H
2
SO
4
1 to 27% -1 to 99˚C
Table B
Sulfunic acid 39..85%
H
2
SO
4
39 to 85% -18 to 116˚C
Table C
Sulfunic acid 93..100%
H
2
SO
4
93 to 100% 10 to 90˚C
Table D
HCl 0..5%
HCl 0 to 5% 0 to 60˚C
Table E
HCl 0..18%
HCI 0 to 18% -10 to 65˚C
Table F
HCl 24..44%
HCI 24 to 44% -20 to 65˚C
Table G
HNO
3
1..5%
HNO
3
1 to 5% 0 to 80˚C
Table H
HNO
3
0..25%
HNO
3
0 to 25% 0 to 80˚C
Table I
HNO
3
35..85%
HNO
3
35 to 85% -16 to 60˚C
Table J
NaOH 1..5%
NaOH 1 to 5% 0 to 100˚C
Table K
NaOH 0..15%
NaOH 0 to 15% 0 to 100˚C
Table L
NaOH 25..50%
NaOH 25 to 50% 0 to 80˚C
Table M
The ready-made temperature compensation matrixes are listed in Table A to M where
temperatures are in the column and concentrations are in the rows.
App.
ISC

YOKOGAWA FLXA21 Specifications

General

Brand	YOKOGAWA
Model	FLXA21
Category	Measuring Instruments
Language	English