Appendix, 2 ph temperature dependency – KROHNE OPTISENS PH 8590 User Manual
Page 45
APPENDIX
7
45
OPTISENS PH 8590
www.krohne.com
03/2012 - 4001931401 MA OPTISENS PH 8590 R01 en
7.2 pH temperature dependency
The output from a pH-electrode varies with the temperature in a predictable way. The size of the
variation depends on both the temperature and the pH being measured.
At pH 7 and 25°C / 77°F the temperature error is zero. If temperature or pH changes the
temperature error is calculated using the following formula:
0.03 pH-difference / pH or 0.03 pH-difference / K
°
C
°
F
pH
pH
pH
pH
pH
pH
pH
pH
pH
pH
pH
pH
5
41
2.30
3.24
4.18
5.12
6.06
7.00
8.06
9.12
10.18 11.24 12.30 13.36
15
59
2.15
3.12
4.09
5.06
6.03
7.00
8.03
9.06
10.09 11.12 12.15 13.18
25
77
2.00
3.00
4.00
5.00
6.00
7.00
8.00
9.00
10.00 11.00 12.00 13.00
35
95
1.85
2.88
3.91
4.94
5.97
7.00
7.97
8.94
9.91
10.88 11.85 12.82
45
113
1.70
2.76
3.82
4.88
5.94
7.00
7.94
8.88
9.82
10.76 11.70 12.64
55
131
1.55
2.64
3.73
4.82
5.91
7.00
7.91
88.2
9.73
10.64 11.55 12.46
65
149
1.40
2.52
3.64
4.76
5.88
7.00
7.88
8.76
9.64
10.52 11.40 12.28
75
167
1.25
2.40
3.55
4.70
5.85
7.00
7.85
8.70
9.55
10.40 11.25 12.10
85
185
1.10
2.28
3.46
4.64
5.82
7.00
7.82
8.64
9.46
10.28 11.10 11.92
95
203
0.95
2.16
3.37
4.58
5.79
7.00
7.79
8.58
9.37
10.16 10.95 11.74
.book Page 45 Monday, March 19, 2012 2:01 PM