Yokogawa 2-Wire Dual Channel Transmitter/Analyzer FLXA21 - Manual (Page 214)

<Appendix 1 For pH/ORP>
App.1-2
IM 12A01A02-01E 5th Edition : Oct. 31, 2013-00
n Matrix temperature compensation
Table 5 shows the defaults for the matrix temperature compensation selectable in Temperature
compensation (Section 4.2.3).
Table 5 Defaults for the matrix temperature compensation (Reference temperature (Tref.): 25.0°C)
Temp. range Solution 1
(Min.)
Solution 2 Solution 3 Solution 4 Solution 5
(Max.)
Tref. (25.0°C) 6.40 pH 7.00 pH 7.30 pH 7.60 pH 9.00 pH
Tmin. (T1) 5.0°C 6.42 pH 7.38 pH 7.94 pH 8.31 pH 9.74 pH
T2 25.0°C 6.40 pH 7.00 pH 7.30 pH 7.60 pH 9.00 pH
T3 45.0°C 6.34 pH 6.70 pH 6.86 pH 7.06 pH 8.40 pH
T4 65.0°C 6.23 pH 6.45 pH 6.54 pH 6.67 pH 7.91 pH
Tmax. (T5) 85.0°C 6.11 pH 6.25 pH 6.31 pH 6.40 pH 7.51 pH
l User setting
Delete the matrix and then enter new values as shown in Table 6. Gray areas are mandatory.
Other areas can be omitted.
Table 6 Example of user setting (Reference temperature (Tref.): 25.0°C)
Temp. range Solution 1
(Min.)
Solution 2 Solution 3 Solution 4 Solution 5
(Max.)
Tref. (25.0°C) 6.40 pH 7.00 pH 7.30 pH 7.60 pH 9.00 pH
Tmin. (T1) 5.0°C 6.42 pH 7.38 pH 7.94 pH 8.31 pH 9.74 pH
T2 25.0°C 6.40 pH 7.00 pH 7.30 pH 7.60 pH 9.00 pH
T3 45.0°C 6.34 pH 6.70 pH 6.86 pH 7.06 pH 8.40 pH
T4 65.0°C 6.23 pH 6.45 pH 6.54 pH 6.67 pH 7.91 pH
Tmax. (T5) 85.0°C 6.11 pH 6.25 pH 6.31 pH 6.40 pH 7.51 pH
Note: The gray areas must be entered.
The reference temperature is set in the Temperature Compensation menu (default: 25.0°C).
Input temperatures for compensation in the Temp. ranges menu.
Input values from Solution 1 (low pH) to Solution 5 (high pH).
After entering all values, select “Check values?” to verify that there is no error. This function
checks if the matrix is consistently incremental or decremental. If any error is found, its location is
specified.
When there is no error, the matrix is compensated linearly and the blanks of the table (if any) are
filled. If some areas are left empty without running “Check values?”, a 1st/2nd comp. matrix error
will be issued.
n Changing the settings
If any setting is accidentally changed, values to the right of the relevant arrow in Table 7 are all
initialized.
Table 7 Parameters that initialize other values
Sensor type -> Measurement -> Output: Process
parameter ->
Linear: 0% value, 100% value
Table
Communication: HART: PV
Display setup: Individual display (Main display)
Trend Graph Screen ->
Y-axis (low, high)
Communication: HART
Impedance settings