Single and dual input analyzers for pH/Redox (ORP)
AX416, AX436, AX460, AX466 & AX468 8 Simple Fault Finding
IM/AX4PH Rev. P 63
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 ()
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
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