Rosemount TankRadar Rex DAU 2100, Service Manual

Page: 100 / 154

Rosemount Tank Radar Rex
Chapter 4 Service
4-56
Service Manual
308012En, Ed.2
May 2013
4.3.2 Checking the Resistance Temperature Detectors
Pt100 sensors (spot measurement) are connected with three wires each.
The Cu90 sensors (average measurement) are connected with a
common ground.
The sensors can be checked by measuring their resistance and the
surrounding temperature. Then check in the tables below. If the
temperature derived from the table does not correspond to the actual
temperature, then the sensor needs to be replaced.
See tables and connection diagrams below. See also Installation
drawings on page 8-1 for connection of the temperature sensors.
Figure 4-27. Pt 100 and Cu90 temperature
Pt100
°C

°C

-50 80.25 +80 130.89
-40 84.21 +90 134.70
-30 88.17 +100 138.50
-20 92.13 +110 142.28
-10 96.07 +120 146.06
0 100.00 +130 149.82
+10 103.90 +140 153.57
+20 107.79 +150 157.32
+25 109.73 +160 161.04
+30 111.67 +170 164.76
+40 115.54 +180 168.47
+50 119.40 +190 172.16
+60 123.24 +200 175.84
+70 127.07
Cu90
°C

°C

-50 71.43 +80 120.95
-40 75.24 +90 124.76
-30 79.05 +100 128.57
-20 82.86 +110 132.38
-10 86.67 +120 136.19
0 90.48 +130 140.00
+10 94.29 +140 143.81
+20 98.10 +150 147.62
+25 100.00 +160 151.42
+30 101.91 +170 155.23
+40 105.72 +180 159.04
+50 109.53 +190 162.85
+60 113.33 +200 166.66
+70 117.14
Pink
White Grey
V
iolet
Blue
Green
Y
ellow
Red
Brown Black
Black
Orange
Cu90 Resistance Elements