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Maintenance
February 2019
CAUTION
The solution used in the following step is an acid and should be handled with care. Follow the directions of the
acid manufacturer. Wear the proper protective equipment. Do not let the solution come in contact with skin
or clothing. If contact with the skin is made, immediately rinse with clean water.
4.
4.2.2
Automatic Temperature Compensator
The temperature compensator element is temperature sensitive and can be checked with an
ohmmeter. Resistance increases with temperature.
The 3K element will read 3000 ohms ±1% at 25°C (77°F) and a Pt-100 will read 110 ohms.
Resistance varies with temperature for a 3K and Pt-100 element and can be determined
according to Table 6-2 or the following formula:
Refer to Table 4-1 for R0 and R1 values
Table 4-1: Temperature vs Resistance of Automatic Temperature Compensator Elements
Temperature °C
0
10
20
25
30
40
50
60
70
80
90
100
Table 4-2: R
and R
Values for Temperature Compensation Elements
0
1
Temperature Element
3K
PT-100
14
Wash the glass bulb in a dilute 5% hydrochloric acid solution and rinse with clean water.
Soaking the sensor overnight in the acid solution can improve cleaning action.
Replace the sensor if it cannot be cleaned.
RT=R0 [l+R1 (T-20)]
Where RT = Resistance
T = Temperature in °C
Resistance (Ohms) ±1
3K
2670
2802
2934
3000
3066
3198
3330
3462
3594
3726
3858
3990
R
0
2934
107.7
Reference Manual
00809-0100-3385
PT-100
100.0
103.8
107.7
109.6
111.5
115.4
119.2
123.1
126.9
130.8
134.6
138.5
R
1
0.0045
0.00385
Maintenance
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