WIKA operating instructions, model CTH7000
EN
46
08/2020 EN/BG
10. Specifications
10. Specifications
10.1 Resistance thermometer measurement
Resistance thermometer measurement
PRT characterization
ITS90
Din90
BS EN60751:1996, IEC60751:1983
Thermistor characterization
CvD
BS EN1904:1984, IEC751:1983
Steinhart and Hart (NTC)
Resistance measurement range (PRT)
1 ... 400 Ω
Resistance measurement range
(Thermistor)
1 ... 400,000 Ω
Temperature measurement range
ITS90
-200 ... +962 °C [-328 ... +1,764 °F]
Din90
-200 ... +850 °C [-328 ... +1,562 °F]
CvD
-150 ... +850 °C [-238 ... +1,562 °F]
Thermistor – type dependent
Accuracy (PRT)
±0.015 °C [15 mK]
Accuracy (NTC
Thermistor)
1/0 ... 400 Ω
±0.006 Ω
400 ... 50 kΩ
±0.01 % of reading
50 ... 400 kΩ
±0.02 % of reading
Resistance measurement uncertainty
±6 mΩ (+20 °C ±5 °C)
Temperature coefficient (resistance
measurement)
0.2 ppm/°C (0.05 mK/°C)
Long term stability (resistance
measurement)
±25 ppm (±2.5 mK/°C) / year
Sense current (PRT)
1 mA (DC) polarity switchable
Sense current (NTC Thermistor)
1 mA, 10 μA, 3 μA auto-select
User selectable measurement display
units
°C/ °F/ K or Ω
Input channels
2
Input connection
2 x 5 pin DIN
Measurement configuration
4 wire
Input impedance
> 10 MΩ
Max common and differential mode input
voltage
DC ±40 V, 28 Vrms