We reserve the right to make changes without prior notice
30
V
mis
= voltage value measured in Volt;
Ps
=
pressure value read on the controller.
Example: Use a probe having an operating range between 0 and 30 bar, and a signal between 4 and 20 mA.
Take the measurement between terminal “GND” and the connected input 630 mVdc: the pressure read by the
controller is calculated as follows.
(30 – 0) / 0.016 x (0.63 / 50 – 0.004) + 0 = 16.1 bar
4.3.3 “NTC” and PT1000 passive probes
Probe types NTC, high temperature NTC and PT1000 are often installed to read the temperature. These
probes change the value of their electrical resistance whenever the temperature value changes.
The read value can be found by disconnecting the probe from the input and measuring its resistance with a
multimeter.
NTC probes
°C Kohm °C
Kohm
°C Kohm
-20 67.74 4
22.99
28 8.94
-16 55.95 8
19.40
32 7.72
-12 46.48 12
16.55
36 6.69
-8 38.75 16
14.12
40 5.82
-4 32.43 20
12.09
44 5.08
0 27.28 24
10.38
48 4.44
High temperature NTC probes
°C Kohm °C
Kohm
°C Kohm
15 78.29 50
18.08
85 5.34
20 62.37 55
14.99
90 4.56
25 50.00 60
12.48
95 3.91
30 40.34 65
10.44
100 3.37
35 32.73 70
8.78
105 2.91
40 26.71 75
7.41
110 2.59
45 21.92 80
6.28
115 1.19
NTC PT1000 probes
°C Kohm °C
Kohm
°C Kohm
15 1058.5 50
1194.0
85 1328.0
20 1077.9 55
1213.2
90 1347.0
25 1097.3 60
1232.4
95 1366.0
30 1116.7 65
1251.6
100 1385.0
35 1136.1 70
1270.7
105 1403.9
40 1155.4 75
1289.8
110 1422.9
45 1174.7 80
1308.9
115 1441.7