IM 12A06S01-00EN-P
47
The freely programmable tables are pre-filled with a basic set of data. This data is based
upon pH sodium buffers for differential type pH sensors. These tables however are intended
for programming of user preferred buffer solutions. The data concerning the pH temperature
characteristic will need to be obtained from the supplier of the buffers.
NOTE
Yokogawa recommend the use of NIST (primary buffer standards) rather than buffers
which have been adjusted by the addition of acid or alkaline materials to the buffer
composition. In this way the customer gets a recognized standard, as well as the
best buffer capacity (the ability to resist pH change with contamination).
• Matrix temperature compensation
Table A.2.7 shows the defaults for the matrix temperature compensation selectable in
Temperature compensation (see section 4.1.4). Setting can be done by HOST system.
Table A2.7: Defaults for the matrix temp. compensation (Tref.= 25.0°C)
Minimum -> Maximum
T
Solution 1 Solution 2 Solution 3 Solution 4 Solution 5
[°C] [pH] [pH] [pH] [pH] [pH]
Minimum
Tref. 25.0
6.40 7.00 7.30 7.60 9.00
T1 5.0
6.42 7.38 7.94 8.31 9.74
T2 25.0
6.40 7.00 7.30 7.60 9.00
T3 45.0
6.34 6.70 6.86 7.06 8.40
T4 65.0
6.23 6.45 6.54 6.67 7.91
Maximum
T5 85.0
6.11 6.25 6.31 6.40 7.51
The reference temperature (Tref) is set in the Temperature Compensation, default 25°C.
Entering of values needs to be done in the HOST system.