Environment Conditions - Endress+Hauser iTEMP HART TMT162 Bedienungsanleitung

TMT162
Endress+Hauser
Long-term stability
 0.18 °F/year ( 0.1 °C/year) or  0.05%/year
Data under reference conditions. % relates to the set span. The larger value applies.
Influence of ambient
temperature (temperature drift)
Total temperature drift = input temperature drift + output temperature drift (see example
below)
Effect on the accuracy when ambient temperature changes by 1 K (1.8 °F):
Input 10 to 400 
typ. 0.001% of measured value, min. 1 m
Input 10 to 2000  typ. 0.001% of measured value, min. 10 m
typ. 0.001% of measured value, min. 0.2 μV
Input -20 to 100 mV
typ. 0.001% of measured value, min. 0.2 μV
Input -5 to 30 mV
Output 4 to 20 mA typ. 0.001% of span
Typical sensitivity of resistance thermometers:
Pt: 0.00385 * R /K
nominal
Example Pt100: 0.00385 x 100 /K = 0.385 /K
Typical sensitivity of thermocouples:
B: 10 μV/K at C: 20 μV/K at
1000 °C (1832 1000 °C (1832
°F) °F)
L: 55 μV/K at N: 35 μV/K at
500 °C (932 °F) 500 °C (932 °F)
Example for calculating measured error for ambient temperature drift:
Input temperature drift  = 10 K (18 °F), Pt100, measuring range 0 to 100 °C (32 to 212 °F)
Maximum process temperature: 100 °C (212 °F)
Measured resistance value: 138.5  (IEC 60751) at maximum process temperature
Typical temperature drift in : (0.001% of 138.5 ) * 10 = 0.01385 
Conversion to Kelvin: 0.01385  / 0.385 /K = 0.04 K (0.054 °F)
Influence of the reference junction (internal cold junction)
Pt100 IEC 60751 Cl. B (internal cold junction for thermocouples TC)
10.0.5

Environment conditions

Ambient temperature
limits
• Without display: -40 to +185 °F (-40 to +85 °C)
• With display: -40 to +176 °F (-40 to +80 °C)
For use in hazardous area, see Ex certification or control drawing
At temperatures < -4 °F (-20 °C) the display may react slowly. Readability of the
display cannot be guaranteed at temperatures < -30 °C (-22 °F).
Cu: 0.0043 * R /K
nominal
D: 20 μV/K at E: 75 μV/K at 500
1000 °C (1832 °C (932 °F)
°F)
R: 12 μV/K at S: 12 μV/K at 1000
1000 °C (1832 °C (1832 °F)
°F)
Technical data
Ni: 0.00617 * R /K
nominal
J: 55 μV/K at K: 40 μV/K at
500 °C (932 °F) 500 °C (932 °F)
T: 50 μV/K at U: 60 μV/K at
100 °C (212 °F) 500 °C (932 °F)
97