Siemens sitrans tr300, Manual

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Technical data
11.1 Technical data
SITRANS TR200/TR300
Operating Instructions, 06/2010, A5E01071992-03
73
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
Auxiliary power supply 24 V ±1 %
Load 500 Ω
Ambient temperature 23 °C
Interfering fields None
Heat-up time > 5 min
Digital measuring error See table in chapter Digital measuring error
(Page 76)
Analog output error (digital-to-analog error) < 0.025 % of the output current span (16 mA)
Fault due to internal cold junction < 0.5 °C (0.9 °F)
Ambient temperature influence
Analog measuring error 0.02 % of the output current span (16 mA)/ 10 °C
(18 °F)
Digital measuring error
In resistance thermometers 0.06 °C (0.11 °F)/10 °C (18 °F)
In thermocouples 0.6 °C (1.1 °F)/10 °C (18 °F)
Influence of the auxiliary power supply < 0.001 % of the output current span (16 mA)/V
Influence of load < 0.002 % of the output current span (16 mA)/
100 Ω
Long-term drift (start of scale value, measuring
span)

< 0.02 % of the measuring span in the first
month

< 0.2 % of the span after one year

< 0.3 % of the span after five years