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TR21-B 1
TR21-B
In stock at WIKA
WIKA · Temperature measurement · Family TR21

Miniature resistance thermometer

For sanitary applications, for orbital welding
Range
-30…150 °C
Output
4-20mA · Direct sensor output
Accuracy
±0.25 K (transmitter)
Protection
IP67
CEEACRoHSREACH
Price
From €574
Confirm at order time
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Description

The model TR21-B 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 ... +150 °C [-22 ... +302 °F]. For use in hazardous areas, intrinsically safe versions are available.

The connection ends are smooth and prepared for orbital welding. The process connections meet the stringent requirements, in terms of materials and design, of hygienic measuring points. All electrical components are protected against moisture (IP67 or IP69K).

The resistance thermometer is available with direct sensor output or integrated transmitter, which can be configured individually via the WIKAsoft-TT PC configuration software. Measuring range, dampening, error signalling per NAMUR NE 043 and TAG no. can be adjusted.

for further approvals see page 5

Model TR21-B with flow-through housing

For easy calibration or maintenance, the sensor is interchangeable without having to open the process. Thus hygiene risks can be minimised and downtimes can be reduced.

The spring loading, integrated into the union nut, guarantees the contact between the sensor tip and the bottom of the protection tube and thus ensures a short response time and lasting high accuracy. Insertion length, process connection, sensor and connection method can each be selected for the respective application within the ordering information. The electrical connection is made via an M12 x 1 circular connector.

For applications requiring the sterilisation of the instrument in autoclaves, an especially temperature-resistant instrument version is available.

Special features

  • Sensor can be calibrated without having to open the process
  • 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
  • Wetted parts from stainless steel 1.4435
  • Self-draining and dead-space minimised, materials and surface finish qualities in accordance with standards of hygienic design
Identification
ModelTR21-B
Product familyTR21
SubcategoryResistance thermometer
Measuring range
Temperature ranges−30…+150 °C · +0…+150 °C
Accuracy
Accuracy class±0.25 K (transmitter), Class A (sensor)
Process conditions
Process connection
Orbital weldingG3/8"
Process temperature−30…+150 °C
Electrical characteristics
Output signal4-20mA · Direct sensor output
Power supplyDC 10 ... 30V
Electrical connectionM12 x 1 circular connector (4-pin)
Materials
Probe materialStainless steel 1.4435, Stainless steel 316L
Thermowell materialStainless steel 1.4435, Stainless steel 316L
Operating environment
Ambient temperature−50…+85 °C
IP ratingIP67
Certifications and approvals
Certifications
CEEACRoHSREACH
Explosion protectionIntrinsically safe versions available
Additional details
Sensor typePt100, Pt1000
Sensor classAA, A
ThermowellYes
Thermowell formflow-through housing
Datasheet languagesEN, DE
Tables from datasheet
Measuring element
Type of measuring element
4 ... 20 mAversion (models TR21-B-xTT, TR21-B-xTB)■ Pt1000 (measuring current < 0.3 mA;self-heating can be ignored) ■ Face-sensitive Pt1000 1) (measuring current < 0.3 mA;self-heating can be ignored)
Pt100 (model TR21-B-xPx)/Pt1000 (model TR21-B-xRx) version■ Pt100 (measuring current: 0.1 ... 1.0 mA) ■ Face-sensitive Pt100 (measuring current 0.1 ... 1.0 mA) 1) ■ Pt1000 (measuring current: 0.1 ... 0.3 mA) ■ Face-sensitive Pt1000 (measuring current 0.1 ... 0.3 mA) 1)
→ For detailed specifications for Pt sensors, see Technical information IN 00.17 at www.wika.com.
Connection method
4 ... 20 mAversion (models TR21-B-xTT, TR21-B-xTB)2-wire
Pt100 (model TR21-B-xPx)/Pt1000 (model TR21-B-xRx) version3-wireWith a cable length of 30 mor longer, measuring deviations can occur
4-wireThe lead resistance can be ignored
Tolerance value of the measuring element 2) per IEC 60751
4 ... 20 mAversion (models TR21-B-xTT, TR21-B-xTB)Class A
Pt100 (model TR21-B-xPx)/Pt1000 (model TR21-B-xRx) version■ Class AA ■ Class A3)
Accuracy specifications (4 ... 20 mA version)
Tolerance value of the measuring element 2) per IEC 60751Class A
Measuring deviation of the transmitter per IEC 62828±0.25 K
Total measuring deviation in accordance with IEC 62828Measuring deviation of the measuring element + transmitter
Influence of the ambient temperature0.1 %of span / 10 KT a
Influence of supply voltage±0.025 %/V(depending on the supply voltage U B )
Influence of the load±0.05 %/ 100Ω
LinearisationLinear to temperature per IEC 60751
Linearisation error±0.1% 1) of the set measuring span
Reference conditions
Ambient temperatureT a ref23 °C
Supply voltage U B refDC 12V
Measuring range
Temperature range
4 ...20 mAversion (modelsTR21-B-xTT,TR21-B-xTB)-30 ...+150 °C [-22 ...+302 °F] 1)
Pt100 (model TR21-B-xPx)/Class AA0 ... 150 °C [32 ... 302 °F]
Pt1000 (model TR21-B-xRx) versionClass A -30 ...+150 °C [-22 Configurable °C, °F, K...+302
Temperature at the connector (Pt100, Pt1000 version)Max. 85 °C [185 °F]
Measuring span (4 ... 20 mA version)Minimum 20 K, maximum 300 K
Process connection
Type of process connection■ Flow-through housing ■ Angular housing
Protection tube
Protection tube modelTW61
Protection tube design→ see drawings from page 10
Surface roughnessPer DIN 11866 row A, B■ R a < 0.8 μm ■ R a < 0.4 μm electropolished
Per DIN 11866 row C, ASME-BPE■ R a < 0.76 μm ■ R a < 0.38 μm electropolished
Connection to thermometerG3/8"
Material (wetted)Per DIN 11866 row A, BStainless steel 1.4435
Per DIN 11866 row C, ASME-BPEStainless steel 316L
View all (20)
Output signal (4 ... 20 mA version)
Analogue output4 ... 20 mA, 2-wire
Load R AR A ≤ (U B - 10 V) / 23 mAwith R A in Ωand U B inV
The permissible load depends on the loop supply voltage. For communication with the instrument with programming unit PU-548, a max. load of 350 Ωis admissible.
Load diagramLoad R A inΩ Voltage U B inV 0 10 24 30 36 1083 833 583 Not for instruments with Ex version
Output signal (4 ... 20 mA version)
Factory configuration
Measuring rangeMeasuring range 0 ... 150 °C [32 ... 302 °F] Other measuring ranges are adjustable
Current signals for error signallingConfigurable in accordance with NAMUR NE 043 downscale ≤ 3.6mA upscale ≥ 21.0mA
Current value for sensor short-circuitNot configurable in accordance with NAMUR NE 043 downscale ≤ 3.6mA
Communication
Info dataTAG no., description and user message can be stored in transmitter
Configuration and calibration dataPermanently stored
Configuration softwareWIKAsoft-TT → Configuration software (multilingual) as a download from www.wika.com
Voltage supply
Supply voltage U BDC 10 ...30V
Supply voltage inputProtected against reverse polarity
Permissible residual ripple of supply voltage10 %generated by U B < 3 %ripple of the output current
Time response
Switch-on delay, electricalMax. 4 s (time before the first measured value)
Warm-up timeAfter approx. 4 minutes, the instrument will function to the specifications (accuracy) given in the data sheet.
Response time (per IEC 60751)t 50 < 3.2 s t 90 < 7.3 s
Electrical connection
Connection typeM12 x 1 circular connector (4-pin)
MaterialStainless steel 1.4404
PinSignalDescription
1L+10 ...30V
2VQnot connected
3L-0V
4Cnot connected
Operating conditions
Ambient temperature range
4 ... 20 mAversion (models TR21-B-xTT, TR21-B-xTB)-40 ...+85 °C [-40 ...+185 °F]
Pt100 (model TR21-B-xPx)/Pt1000 (model TR21-B-xRx) version-50 ...+85 °C [-58 ...+185 °F] -40 ...+85 °C [-40 ...+185 °F]
Climate class per IEC 60654-1
4 ... 20 mAversion (models TR21-B-xTT, TR21-B-xTB)Cx (-40 ...+85 °C [-40 ...+185 °F], 5 ... 95 %r.h.)
Pt100 (model TR21-B-xPx)/Pt1000 (model TR21-B-xRx) versionCx (-50 ...+85 °C [-58 ...+185 °F], 5 ... 95 %r.h.) 100 %r.h., condensation allowed
Max. operating pressureDependent on particular process connection
Salt fogIEC 60068-2-11
Shock resistance per IEC 60068-2-2750 g, 6 ms, 3 axes, 3 directions, three times per direction
Maximum permissible autoclaving conditionsMax. 134 °C, 3 bar abs., 100 %r.h., duration 20 min., max. 50 cycles
Autoclavable with mounted protective cap at coupler connector
Conditions for outdoor use (only applies to UL approval)■ The instrument is suitable for applications with pollution degree 3. ■ The power supply must be suitable for operation above 2,000m should the temperature transmitter be used at this altitude. ■ The instrument shall be installed in locations sheltered from the weather. ■ The instrument shall be installed sun/UV irradiation protected.
Ingress protection (IP code)
Case with connected connector 1)■ IP67 per IEC/EN 60529 ■ IP69 per IEC/EN 60529 ■ IP69K per ISO 20653
The stated ingress protection only applies when plugged in using line connectors that have the appropriate ingress protection.
Coupler connector, not connectedIP67 per IEC/EN 60529
Weight in kgapprox. 0.3 ... 2.5 (depending on version)
LogoDescriptionRegion
EU declaration of conformityEuropean Union
EMCdirective 1) 2) EN 61326 emission (group 1, class B) and immunity (industrial application)
Pressure equipment directive For thermowells/protection tubes > DN 25 (1") and for the associated marking on the measuring instrument or thermowell/protection tube,WIKA confirms conformity with the pressure equipment directive in accordance with the conformity assessment procedure, module H. thermowells/protection tubes with nominal widths of ≤ DN 25 (1"), a CE marking in with the pressure equipment directive (PED) is not permitted and therefore, they are engineering
For accordance designed and manufactured without CE marking in line with the applicable sound practice. RoHS directive
UL - only for instrument version without explosion protection Safety (e.g. electr. safety, overpressure, ...)USA and Canada
LogoDescriptionRegion
EU declaration of conformityEuropean Union
ATEX directive Hazardous areas
IECEx - in combination with ATEX Hazardous areas Zone 0 gas Ex ia IIC T1 ...T6 Ga Zone 1 mounting to zone 0 gas Ex ia IIC T1 ...T6 Ga/Gb Zone 1 gas Ex ia IIC T1 ...T6 Gb Zone 20 dust Ex ia IIIC T135 °C Da Zone 21 mounting to zone 20 dust Ex ia IIIC T135 °C Da/DbInternational
CSA Safety (e.g. electr. safety, overpressure, ...) Hazardous areas Class I, division 1 or 2, groups A, B, C, DT1 ...T6 Class I, zone 0 or 1, IIC Ex/AEx ia IIC T1 ...T6 Ga Class II / III, division 1 or 2, groups E, F, GT1 ...T6 / 135 °CUSA and Canada
EAC 1)Eurasian Economic Community
Hazardous areas Zone 0 gas 0Ex ia IICT6…T1GaX Zone 1 gas 1Ex ia IICT6…T1GbX Zone 1 gas Ex ia IIIC T135 °C Gb X Zone 1 mounting to zone 0 gas Ex ia IIC T6 …T1Ga/Gb X Zone 20 dust Ex ia IIIC T135 °C Da X Zone 20 dust Ex ia IIIC T80 …T440 Da X Zone 21 dust Ex ia IIIC T80 …T440 Db X
Ex Ukraine Hazardous areas Zone 0 gas Zone 20 dust Zone 1 mounting to zone 0 gas Zone 21 mounting to zone 20 dust Zone 1 gas Zone 21 dust Zone 1 gasII 1G Ex ia IICT6…T1Ga II 1D Ex ia IIIC T135 °C Da II 1/2G Ex ia IIC T6 …T1Ga/Gb II 1/2D Ex ia IIIC T135 °C Da/Db II 2G Ex ia IICT6…T1Gb II 2D Ex ia IIIC T135 °C Db II 2G Ex ib IICT6…T1GbUkraine
CCC 3) Hazardous areas Zone 0 gas Ex ia IIC T1~T6 Ga Zone 1 gas Ex ia IIC T1~T6 Gb Zone 1 mounting to zone 0 gas Ex ia IIC T1~T6 Ga/GbChina
PAC Russia Metrology, measurement technologyRussia
PAC Kazakhstan Metrology, measurement technologyKazakhstan
LogoDescriptionRegion
-MChS Permission for commissioningKazakhstan
PAC Belarus Metrology, measurement technologyBelarus
PAC Uzbekistan Metrology, measurement technologyUzbekistan
®3-A 4) Hygienic DesignUSA
JANUARY 2019 TYPE EL CLASS IEHEDG 4) Hygienic DesignEuropean Union
Certificates
Certificates■ 2.2 test report ■ 3.1 inspection certificate ■ DAkkS calibration certificate ■ Manufacturer&#x27;s declaration regarding regulation (EC) 1935/2004 and (EC) 2023/2006 ■ Certificate of the surface roughness of wetted parts
Hygienic certificates3-A approvalEHEDG approval
Flow-through housingFor all dimensionsFor all dimensions
Angular housingDIN 11866 row A:DN 32 ... 100 DIN 11866 row B:DN 25 ... 80 DIN 11866 row C:DN 1 ½" ... 4"DIN 11866 row A:DN 32 ... 100 DIN 11866 row B:DN 25 ... 80 DIN 11866 row C:DN 1 ½" ... 4"
Patent numberDescription
DE 102010037994 US 12 897.080Dead-space free welding nipple for protection tube modelTW61
Hazardous gas atmosphereTemperature classAmbient temperature range (T a )Maximum surface temperature (T max ) at the tip of the probe or protection tube
II 1G Ex ia IIC T1 - T6 Ga II 1/2G Ex ia IIC T1 - T6 Ga/Gb II 2G Ex ia IIC T1 - T6 GbT6-40 ...+45 °CT M (medium temperature) + self-heating (15 K) Pay attention to the special conditions for safe
T5-40 ...+60 °Cuse.
T4-40 ...+85 °C
T3-40 ...+85 °C
T2-40 ...+85 °C
T1-40 ...+85 °C
Hazardous dust atmospherePower P iAmbient temperature range (T a )Maximum surface temperature (T max ) at the tip of the probe or protection tube
II 1D Ex ia IIIC T135 °C Da II 1/2D Ex ia IIIC T135 °C Da/Db II 2D Ex ia IIIC T135 °C Db750mW 650mW 550mW-40 ...+40 °C -40 ...+70 °C -40 ...+85 °CT M (medium temperature) + self-heating (15 K) Pay attention to the special conditions for safe use.
ParametersHazardous gas atmosphereHazardous dust atmosphere
Terminals+ / -+ / -
Voltage U iDC 30VDC 30V
Current l i120mA120mA
Power P i800mW750/650/550mW
Effective internal capacitance C i29.7 nF29.7 nF
Effective internal inductance L iNegligibleNegligible
Maximum self-heating at the probe or protection tube tip15 K15 K
MarkingTemperature classAmbient temperature range (T a )Maximum surface temperature (T max ) at the tip of the probe or protection tube
II 1G Ex ia IIC T1 - T6 Ga II 1/2G Ex ia IIC T1 - T6 Ga/Gb II 2G Ex ia IIC T1 - T6 GbT6-50 ...+80 °CT M (medium temperature) + self-heating Pay attention to the special conditions for safe
T5-50 ...+85 °Cuse.
T4-50 ...+85 °C
T3-50 ...+85 °C
T2-50 ...+85 °C
T1-50 ...+85 °C
MarkingPower P iAmbient temperature range (T a )Maximum surface temperature (T max ) at the tip of the probe or protection tube
II 1D Ex ia IIICT135 °C Da II 1/2D Ex ia IIICT135 °C Da/Db II 2D Ex ia IIICT135 °C Db750mW 650mW 550mW-50 ...+40 °C -50 ...+70 °C -50 ...+85 °CT M (medium temperature) + self-heating Pay attention to the special conditions for safe use.
ParametersGas applicationsDust applications
Terminals1 - 41 - 4
Voltage U iDC 30VDC 30V
Current l i550mA250mA
Power P i1,500mW750/650/550mW
Effective internal capacitance C iNegligibleNegligible
Effective internal inductance L iNegligibleNegligible
Maximum self-heating at the probe or protection tube tip(R th ) = 335 K/W(R th ) = 335 K/W