Siemens SITRANS T4200 Operating Instructions Manual page 76

Measuring accuracy
The digital accuracy is the accuracy following analog-to-digital conversion including
linearization and measured value calculation.
The 4 to 20 mA output current is subject to an additional error arising from the digital-to-
analog conversion. This error is called a digital-to-analog error.
The overall error on the analog output under reference conditions is the total of the digital
error and the digital-to-analog error. Where applicable, plus the cold junction error in the
case of thermocouple measurements.
Measuring accuracy
Reference conditions
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Digital measuring error
Analog output error (digital-to-analog
error)
Fault due to internal cold junction
Ambient temperature influence


Influence of the auxiliary power supply
Influence of load
Long-term drift (start of scale value,
measuring span)
SITRANS TH200/TH300
Operating Instructions, 06/2010, A5E00393069-03
Auxiliary power supply
Load
Ambient temperature
Interfering fields
Heat-up time
Analog measuring error
Digital measuring error
In resistance thermometers
In thermocouples
24 V ±1 %
500 Ω
23 °C
None
> 5 min
See table in chapter Digital measuring error (Page 78)
< 0.025 % of the output current span (16 mA)
< 0.5 °C (0.9 °F)
0.02 % of the output current span (16 mA)/ 10 °C (18 °F)
0.06 °C (0.108 °F)/10 °C (18 °F)
0.6 °C (1.08 °F)/10 °C (18 °F)
< 0.001 % of the output current span (16 mA)/V
< 0.002 % of the output current span (16 mA)/ 100 Ω
< 0.02 % of the measuring span in the first month

< 0.2 % of the measuring span after one year

< 0.3 % of the measuring span after five years

Technical data
11.1 Technical data
75