Temperature Measurement
Transmitters for rail mounting
SITRANS TR300
two-wire system, universal, HART
3/39
Siemens FI 01 · 2012
Factory setting:
• Pt100 (IEC 751) with 3-wire circuit
• Measuring range: 0 ... 100 °C (32 ... 212 °F)
• Error signal in the event of sensor breakage: 22.8 mA
• Sensor offset: 0 °C (0 °F)
• Damping 0.0 s
Measuring range parameterizable
max. -100 … 1100 mV
Min. measured span 2mV or 20mV
Overload capability of the input -1.5 ... +3.5 V DC
Input resistance ≥ 1MΩ
Characteristic curve Voltage-linear or special charac-
teristic
Output
Output signal 4 ... 20 mA, 2-wire with communi-
cation acc. to HART Rev. 5.9
Auxiliary power 11 ... 35 V DC (to 30 V with Ex)
Max. load (U
aux
–11 V)/0.023 A
Overrange 3.6 ... 23 mA, infinitely adjustable
(default range: 3.84 ... 20.5 mA)
Error signal (e.g. following sensor
fault) (conforming to NE43)
3.6 ... 23 mA, infinitely adjustable
(default value: 22.8 mA)
Sample cycle 0.25 s nominal
Damping Software filter 1st order 0 ... 30 s
(parameterizable)
Protection Against reversed polarity
Electrical isolation Input against output (1 kV
eff
)
Measuring accuracy
Digital measuring errors see table "Digital measuring
errors"
Reference conditions
• Auxiliary power 24 V ± 1 %
•Load 500 Ω
• Ambient temperature 23 °C
• Warming-up time > 5 min
Error in the analog output (digi-
tal/analog converter)
< 0.025 % of span
Error due to internal cold junction < 0.5 °C (0.9 °F)
Temperature effect < 0.1 % of max. span/10 °C
(18 °F)
Auxiliary power effect < 0.001 % of span/V
Effect of load impedance < 0.002 % of span/100 Ω
Long-term drift
• In the first month < 0.02 % of span in the first month
• After one year < 0.2 % of span after one year
• After 5 years < 0.3 % of span after 5 years
Conditions of use
Ambient conditions
Ambient temperature range -40...+85°C (-40...+185°F)
Storage temperature range -40...+85°C (-40...+185°F)
Relative humidity < 98 %, with condensation
Electromagnetic compatibility acc. to EN 61326 and NE21
Design
Material Plastic, electronic module potted
Weight 122 g
Dimensions See "Dimensional drawings"
Cross-section of cables Max. 2.5 mm² (AWG 13)
Degree of protection to IEC 60529
•Enclosure IP20
Certificates and approvals
Explosion protection ATEX
EC type test certificate PTB 07 ATEX 2032X
• "Intrinsic safety" type of protection II 2(1) G Ex ia/ib IIC T6/T4
II 3(1) G Ex ia/ic IIC T6/T4
II 3 G Ex ic IIC T6/T4
II 2(1) D Ex iaD/ibD 20/21 T115 °C
• Type of protection, "equipment is
non-arcing"
II 3 G Ex nA IIC T6/T4
Other certificates NEPSI
© Siemens AG 2011
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