Pyromation T82 - Manual (Page 37)

T82 Technical data
37
Output
£ 2 mA
Influence of the supply
voltage ≤ ±0.0025%/V, with reference to the span
Long-term stability ≤ 0.1 °C/year (≤ 0.18 °F/year) or ≤ 0.05 %/year
Data under reference operating conditions. % refers to the set span. The larger value is valid.
Influence of ambient
temperature (temperature
drift) Total temperature drift = input temperature drift + output temperature drift
Impact on accuracy when ambient temperature changes by 1 K (1.8 °F):
Input10 to 400W Typ. 0.001 % of the measured value, min. 1 mW
Input 10 to 2 000 W Typ. 0.001 % of the measured value, min. 10 mW
Input –20 to 100 mV Typ. 0.001 % of the measured value, min. 0.2 µV
Output 4 to 20 mA Typ. 0.0015 % of the span
Typical sensitivity of resistance thermometers
Pt: 0.00385 * R
nom
/K Cu: 0.0043 * R
nom
/K Ni: 0.00617 * R
nom
/K
Example Pt100: 0.00385 * 100 W/K = 0.385 W/K
Typical sensitivity of thermocouples:
B: 9 µV/K at
1
000 °C (1 832 °F)
C: 18 µV/K at
1
000 °C (1 832 °F)
D: 20 µV/K at
1
000 °C (1 832 °F)
E: 81 µV/K at
500 °C (932 °F) J: 56 µV/K at
500 °C (932 °F) K: 43 µV/K at
500 °C (932 °F)
L: 60 µV/K at
500 °C (932 °F) N: 38 µV/K at
500 °C (932 °F) R: 13 µV/K at
1
000 °C (1 832 °F)
S: 11 µV/K at
1
000 °C (1 832 °F)
T: 46 µV/K at
100 °C (212 °F) U: 70 µV/K at
500 °C (932 °F)
Example of calculating the measured error with ambient temperature drift:
Input temperature drift DJ = 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 W (IEC 60751) at maximum process temperature
Typical temperature drift in W: (0.001 % of 138.5 W) * 10 = 0.01385 W
Conversion to Kelvin: 0.01385 W / 0.385 W/K = 0.04 K (0.072 °F)
Influence of the reference
junction (internal cold
junction) Pt100 DIN IEC 60751 Cl. B (internal cold junction with thermocouples TC)
12.5 Environment
Ambient temperature range –40 to +85 °C (–40 to +185 °F), for hazardous area see Ex documentation and 'Certificates and
approvals' section (® ä 39)
Storage temperature –40 to +100 °C (–40 to +212 °F)