Yokogawa EXA ISC202 2-wire Conductivity Transmitter/Analyzer - Manual (Page 56)

IM 12D06A03-01E
5-14 Parameter setting
5-3-3. Temperature compensation functions
Code 20 *T.R.°C Choose a temperature to which the measured conductivity (or resistivity) value
must be compensated. Normally 25°C is used, therefore this temperature is
chosen as default value. Limitations for this setting are: -20 to 140 °C.
If *T.UNIT in code 11 is set to °F, default value is 77°F and the limitations are
0 - 280°F.
Code 21 *T.C.1, 2 In addition to the procedure described in section 5-2-4 and 5-2-5 it is possible
to adjust the compensation factor directly. If the compensation factor of the
sample liquid is known from laboratory experiments or has been previously
determined, it can be introduced here.
Adjust the value between 0.00 to 3.50 % per °C. In combination with reference
temperature setting in code 20 a linear compensation function is obtained,
suitable for all kinds of chemical solutions.
Code 22 *MATRX The EXA is equipped with a matrix type algorithm for accurate temperature
compensation in various applications. Select the range as close as possible
to the actual temperature/concentration range. The EXA will compensate by
interpolation and extrapolation. Consequently, there is no need for a 100%
coverage.
If 9 is selected the temperature compensation range for the adjustable matrix
must be configured in code 23. Next the specific conductivity values at the
different temperatures must be entered in codes 24 to 28. Matrix data is
exeplified in Appendix 11-3
Code 23 *T1, *T2, *T3, Set the matrix compensation range. It is not necessary to enter equal
*T4 & *T5 °C temperature steps, but the values should increase from T1 to T5, otherwise
the entrance will be refused. Example: 0, 10, 30, 60 and 100 ºC are valid
values for the T1....T5. The minimum span for the range (T5 - T1) is 25 °C. The
valid range for a temperature value is -20º to 140ºC.
Code 24-28 *L1xT1 - In these access codes the specific conductivity values can be entered for
L5xT5 5 different concentrations of the process liquid; each one in one specific access
code (24 to 28). The table below shows a matrix entering example for 0.5 - 5%
H
2
SO
4
solution for a temperature range from 0 - 100 °C. Conductivity range
from 0.0 μS/cm to 1999 mS/cm.
NOTES:
1. In chapter 11 a table is included to record your programmed values. It will make programming
easy for duplicate systems or in case of data loss.
2. Each matrix column has to increase in conductivity value.
3. Error code E4 occurs when two standard solutions have identical conductivity values at the
same temperature within the temperature range.
Table 5-2. Default of user adjustable matrix
T1 T2 T3 T4 T5
Code 23 Temp. 0 °C 25 °C 50 °C 75 °C 100 °C
Code 24 Solution 1 L1 33.8 mS/cm 47.0 mS/cm 57.5 mS/cm 63.7 mS/cm 68.0 mS/cm
Code 25 Solution 2 L2 63.5 mS/cm 92.3 mS/cm 112.5 mS/cm 126.0 mS/cm 137.5 mS/cm
Code 26 Solution 3 L3 95.0 mS/cm 135.3 mS/cm 166.0 mS/cm 188.5 mS/cm 206.0 mS/cm
Code 27 Solution 4 L4 124.5 mS/cm 178.0 mS/cm 220.0 mS/cm 249.0 mS/cm 273.0 mS/cm
Code 28 Solution 5 L5 154.0 mS/cm 218.0 mS/cm 270.0 mS/cm 307.0 mS/cm 336.0 mS/cm