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Model TR21-A Miniature Resistance Thermometer
Brand: WIKA Instruments Ltd.The model TR21-A resistance thermometer provides temperature measurement in sanitary applications and can be used for the measurement of liquid and gaseous media in the range of -30 to 250 °C (-22 to 482 °F). For application in hazardous areas, intrinsically safe versions are available.
Features- Sensor can be calibrated without having to open the process
- Compact design for space-saving fitting
- Simple and fast electrical connection via M12 x 1 plug connector
- With direct sensor output (Pt100/Pt1000 in 3 or 4-wire version) or integrated transmitter with 4-20 mA output signal, individually parameterisable with free-of-charge WIKAsoft-TT PC configuration software
- Materials and surface finish quality in accordance with standards of hygienic design
Specifications
Brand
Temperature Range
- -30 ... +250° C (-22 ... +482° F)
Measuring Element
- Pt1000
- Face-sensitive Pt1000
Connection Method
- 2-wire The lead resistance is recorded as an error in the measurement.
Tolerance Value of the Measuring Element Per IEC 60751
- Class A
Measuring Span
- Minimum 20 K, maximum 300 K
Measuring Deviation of the Transmitter Per IEC 60770
- ±0.25 K
Total Measuring Deviation Per IEC 60770
- Measuring deviation of the measuring element + the transmitter
Basic Configuration
- Measuring Range 0 ... 150° C (32 ... 302° F), other Measuriing Ranges are adjustable
Analogue Output
- 4 ... 20 mA, 2-wire
Linearisation
- Linear to temperature per IEC 60751
Linearisation Error
- ±0.1 %
Switch-on Delay, Electrical
- Max. 4 s (time before the first measured value)
Warming-up Period
- After approx. 4 minutes, the instrument will function to the specifications (accuracy) given in the data sheet.
Current Signals for Error Signalling
- upscale ≥ 21.0 mA
- downscale ≤ 3.6 mA
- Configurable in accordance with NAMUR NE43
Sensor Short-circuit
- Not configurable, in accordance with NAMUR NE43 downscale ≤ 3.6 mA
Sensor Current
- < 0.3 mA (self-heating can be ignored)
Load RA
- RA ≤ (UB - 10 V) / 23 mA with RA in Ω and UB in V
Effect of Load
- ±0.05 % / 100 Ω
Power Supply UB
- DC 10 ... 30 V
Max. Permissible Residual Ripple
- 10 % generated by UB < 3 % ripple of the output current
Power Supply Input
- Protected against reverse polarity
Power Supply Effect
- ±0.025 % / V (depending on the power supply UB)
Influence of the Ambient Temperature
- 0.1% of Span / 10 K Ta
Electromagnetic Compatibility (EMC)
- EN 61326 emission (group 1, class B) and interference immunity (industrial application) 5), configuration at 20 % of the full measuring range
Temperature Units
- Configurable °C, °F, K
Info Data
- TAG no., description and user message can be stored in transmitter
Configuration & Calibration Data
- Permanently stored
Response Time (per IEC 60751)
- t50 < 4.7 s t90 < 12.15 s
Electrical Connection
- M12 x 1 circular connector (4-pin)
Autoclavability (Option)
- Autoclavable with mounted protection cap at connecting plug (for further information see “Ambient conditions”)
Explosion Protection (Option)
- Intrinsically safe to Ex i (ATEX) gas/dust (for further information see “Further specifications for explosion-protected version”)
