WIKA operating instructions, model CTH7000
EN
38
08/2020 EN/BG
4. Design and function
4.4 Instrument range
4.4.1 Instrument measurement working range
The instrument can detect the following conditions open circuit probe, over range
measurement and under range measurement. These conditions are shown by a line of
dashes ‘----------‘ on the LC display.
Open circuit probe = Because of the potentially high resistances of thermistors, it may not
be possible to determine the difference between connected and disconnected probes for
these sensors.
1
No reading available
2
Reading overflow
3
No reading available
4.4.2 Measurement ranges
Measurement
units thermistor
Conversion
Under range
Over range
Units
Resistance
None
0
400 Ω
ohms
Temperature
S & H
Thermistor dependent
°C/ °F/K
Measurement
units PRT
Conversion
Under range
Over range
Units
Resistance
None
0
410 Ω
ohms
Temperature
Din90
-201 °C
+851 °C
°C/ °F/K
CvD
-201 °C
+850 °C
°C/ °F/K
ITS90
-201 °C
+963 °C
°C/ °F/K
1
2
3
