WIKA TR21-A Manual De Instrucciones página 26

13. Specifications
Thermometer with transmitter and output signal 4 ... 20 mA (models TR21-x-ZTT
and TR21-x-ZTB)
Linearisation error
EN
Switch-on delay, electrical
Warming-up period
Current signals for error
signalling
Sensor short circuit
Sensor current
Load R
A
Effect of load
Power supply U
Max. permissible residual ripple
Power supply input
Power supply effect
Influence of the ambient
temperature
Electromagnetic compatibility
(EMC)
5)
Temperature units
Info data
Configuration and calibration
data
Response time (measurement
per IEC 60751)
Electrical connection
Autoclavability (option)
Readings in % refer to the measuring span
1) The temperature transmitter should therefore be protected from temperatures over 85 °C (185 °F).
2) Through their small design, face-sensitive measuring resistors serve to reduce the heat dissipation with short insertion
lengths. Available for the temperature range up to 150 °C (302 °F).
For thermowell insertion lengths of less than 50 mm, face-sensitive measuring resistors are recommended.
For thermowell insertion lengths of less than 11 mm, face-sensitive measuring resistors are generally used.
3) ±0.2 % for measuring ranges with a lower limit less than 0 °C (32 °F)
4) Use resistance thermometers with shielded cable, and, if the lines are longer than 30 m or leave the building, ground the
shield on at least one end of the lead. The instrument must be operated grounded.
5) During transient interferences (e.g. burst, surge, ESD) take into account an increased measuring deviation of up to 2 %.
26
±0.1 %
max. 4 s (time before the first measured value)
After approx. 4 minutes, the instrument will function to the
specifications (accuracy) given in the data sheet.
Configurable in accordance with NAMUR NE43
downscale ≤ 3.6 mA
Not configurable, in accordance with NAMUR NE43
downscale ≤ 3.6 mA
< 0.3 mA (self-heating can be ignored)
R
A
±0.05 % / 100 Ω
DC 10 ... 30 V
B
10 % generated by U
Protected against reverse polarity
±0.025 % / V (depending on the power supply)
0.1 % of span / 10 K T
EN 61326 emission (group 1, class B) and interference
immunity (industrial application)
full measuring range
Configurable °C, °F, K
TAG No., description and user message can be stored in
transmitter
Permanently stored
t
50
M12 x 1 circular connector (4-pin)
Autoclavable with mounted protection cap at the coupler
connector (for further information see "Ambient conditions")
3)
upscale ≥ 21.0 mA
≤ (U - 10 V) / 23 mA with R
B
< 3 % ripple of the output current
B
a
< 4.7 s t < 12.15 s
90
WIKA operating instructions model TR21
in Ω and U in V
A B
, configuration at 20 % of the
4)