July 2004
5A - 23
Functions - water system
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500
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Function: Temperature sensor
Resistance measurement
Normal
Normal
Normal
temp.
temp.
resistance
(
°
F)(
°
C)(R)
(Ohm)
122
50
1802
131
55
1495
140
60
1246
149
65
1044
158
70
878.5
167
75
742.8
176
80
630.7
185
85
537.9
194
90
460.6
203
95
395.9
212
100
341.6
Temperature sensor –resistance in ohm
Temperature
sensor
–
temperature
in
°
C
•
The sensor is an NTC-type sensor, i. e. the
resistance decreases with increasing tem-
perature. A constant voltage is applied to this
sensor by the control system.
•
The electric current, which is linearly depen-
dent on the sensor resistance, is registered
by the control system. This signal is used for
the ON/OFF control of the relays.
•
The NTC properties can be used to check
the boiler function, e.g. by short-circuiting
both inputs of the sensor on the control
system. In this case, the heating system is
switched off.
•
Conversely, the control system switches on
the heating system whenever the plug con-
nector of the sensor is pulled off.
Checking the resistance of the temperature
sensor:
One of the two following methods can be ap-
plied on an optional basis:
a) comparative measurement old-new, at identi-
cal temperature
b) resistance measurement and comparison with
the value from the chart. Due to intrinsic
heating, the measuring current is not allowed
to drop below 1 mA.
Cafitesse 700 - Functions - water system
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