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Single and Dual Input Analyzers for pH/Redox (ORP)
AX416, AX436, AX460, AX466 & AX468
8 SIMPLE FAULT FINDING
64
IM/AX4PH
Issue 9
8.3 Checking the Temperature Input
Check the analyzer responds to a temperature input.
Disconnect the Pt100/Pt1000/Balco 3K leads and connect a
suitable resistance box directly to the analyzer inputs - see
section 6.4, page 50 (wall-/pipe-mount analyzer) or see section
6.5, page 52 (panel-mount analyzer). Check the analyzer
displays the correct values as set on the resistance box - see
Table 8.2.
Incorrect readings usually indicate an electrical calibration
problem. Re-calibrate the analyzer as detailed in Section 7.
Temperature
Input Resistance (
Ω
)
ºC
ºF
Pt100
Pt1000
Balco 3K
0
32
100.00
1000.0
2663
10
50
103.90
1039.0
2798
20
68
107.79
1077.9
2933
25
77
109.73
1097.3
3000
30
86
111.67
1116.7
3068
40
104
115.54
1155.4
3203
50
122
119.40
1194.0
3338
60
140
123.24
1232.4
3473
70
158
127.07
1270.7
3608
80
176
130.89
1308.9
3743
90
194
134.70
1347.0
3878
100
212
138.50
1385.0
4013
130.5
267
150.00
1500.0
4424
Table 8.2 Temperature Readings for Resistance Inputs