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Maintenance
The 3K element reads 3000 ohms ±1% at 77 °F (25 °C), and a Pt100 reads 110 ohms.
Resistance varies with temperature for a 3K and Pt-100 element and can be determined
according to Table or the following formula:
R
= R
T
Where R
Refer to
Table 4-1:
Temperature Compensation
Element
3K
PT-100
Table 4-2:
Temperatre °C
0
10
20
25
30
40
50
60
70
80
90
100
4.3
ORP
4.3.1
Platinum Electrode Check
The platinum electrode may be checked as follows. There are two types of standard
solutions which may be used to check the ORP electrode/transmitter system.
Type 1: One type of commonly used ORP standard solution is the saturated quinhydrone
solution (PN R508-16OZ). Refer to
28
[1 + R
(T-20)
O
1
= Resistance and T = Temperature in °C
T
Table 4-1
for R
and R
O
1
R
and R
Values for Temperature Compensation Elements
O
1
Temperature vs. Resistance of Auto T.C. Elements
values.
R
O
2934
107.7
Resistance (Ohms) ±1%
3K
26270
2802
2934
3000
3066
3198
3330
3462
3594
3726
3858
3990
Section
3.3.
R
1
.0045
.00385
PT-100
100.0
103.8
107.7
109.6
111.5
115.4
119.2
123.1
126.9
138.5
134.6
138.5
389/389VP
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