Miniature resistance thermometer
Description
The model TR21-C 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 ... +250 °C [-22 ... +482 °F]. For use in hazardous areas, intrinsically safe versions are available.
These thermometers are fitted with process connections that 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 6
Fig. left: Without neck tube, with clamp connection Fig. right: Tapered design, G 1/2
The welded junction between the protection tube and the flange makes the use of a sealing as additional material in those areas redundant which are in contact with the product. Through the compact design, this resistance thermometer is designed specifically for operation in applications with limited mounting space. 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
- 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
Build a TR21-C for your task
The article number is assembled automatically. If unsure — ask an engineer; we'll match the line's parameters.
- Approvals—
- preselection output signalTransmitter
- Output signal4…20mA, 2-wire
- Transmitter Unit°C
- Process temperature-30 ... +150°C
- Transmitter range start value0
- Transmitter range end value150
- Protection tubeWelded on
- Process connectionTRI-Clamp (ASME BPE)
- Size / Design—
- Protection tube diameter6 mm
- Material wetted partsStainless steel 1.4435 (316L) UNS S31603, Ra ≤ 0.76 µm
- Insertion length [U1 or l1]—
- Neck length [N]0
- Neck tube diameterwithout
- Permissible ambient temperature-40 ... +85 °C (-40 ... +185 °F)
- Accessories electr. connectionWithout
- CertificatesWithout
Finish your configuration
Select every option to submit the request.
| Type of measuring element | ||
|---|---|---|
| 4 ... 20 mAversion (models TR21-C-xTT, TR21-C-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-C-xPx)/Pt1000 (model TR21-C-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-C-xTT, TR21-C-xTB) | 2-wire | |
| Pt100 (model TR21-C-xPx)/Pt1000 (model TR21-C-xRx) version | 3-wire | With a cable length of 30 mor longer, measuring deviations can occur |
| 4-wire | The lead resistance can be ignored | |
| Tolerance value of the measuring element 2) per IEC 60751 | ||
| 4 ... 20 mAversion (models TR21-C-xTT, TR21-C-xTB) | Class A | |
| Pt100 (model TR21-C-xPx)/Pt1000 (model TR21-C-xRx) version | ■ Class ■ Class A | AA |
| Accuracy specifications | |
|---|---|
| Measuring deviation of the transmitter per IEC 62828 | ±0.25 K |
| Total measuring deviation in accordance with IEC 62828 | Measuring deviation of the measuring element + transmitter |
| Influence of the ambient temperature | 0.1 %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 |
| Linearisation | Linear to temperature per IEC 60751 |
| Linearisation error | ±0.1% 1) of the set measuring span |
| Reference conditions | |
| Ambient temperatureT a ref | 23 °C |
| Supply voltage U B ref | DC 12V |
| Temperature range | |
|---|---|
| 4 ... 20 mAversion (models TR21-C-xTT, TR21-C-xTB) | ■ -30 ...+150 °C [-22 ...+302 °F] ■ -30 ...+250 °C [-22 ...+482 °F] 1) |
| Pt100 (model TR21-C-xPx)/Pt1000 (model TR21-C-xRx) version | Class AA 0 ... 150 °C [32 ... 302 °F] Class A -30 ...+250 °C [-22 ...+482 |
| Unit (4 ... 20 mA version) | Configurable °C, °F, K |
| Temperature at the connector (Pt100, Pt1000 version) | Max. 85 °C [185 °F] |
| Measuring span (4 ... 20 mA version) | Minimum 20 K, maximum 300 K |
| Type of process connection | ■ Clamp ■ VARINLINE ® ■ NEUMOBioControl ® ■ Union nut DIN 11851 ■ Tapered hygienic threaded connections ■ Ingold connection |
|---|---|
| Protection tube | |
| Protection tube design | → see drawings from page 11 |
| Protection tube diameter | ■ 6mm ■ Protection tube tip stepped down to 4.5 mm(from U 1 > 25 mm) |
| Surface roughness | ■ R a ≤ 0.76 µm (SF3 per ASME BPE) ■ R a ≤ 0.38 µm (SF4 per ASME BPE) ■ R a ≤ 0.38 µm electropolished (SF4 per ASME BPE) |
| Insertion length U 1 1) | ■ 25mm ■ 50mm ■ 75mm ■ 100mm ■ 150mm ■ 200mm |
| Other insertion lengths on request | |
| Material (wetted) | Stainless steel 1.4435 (316L, UNS S31603) |
View all (20)
| Output signal (4 ... 20 mA version) | |
|---|---|
| Analogue output | 4 ... 20 mA, 2-wire |
| Load R A | R 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 diagram | Load R A inΩ Voltage U B inV 0 10 24 30 36 1083 833 583 Not for instruments with Ex version |
| Factory configuration | |
| Measuring range | Measuring range 0 ... 150 °C [32 ... 302 °F] Other measuring ranges are adjustable |
| Current signals for error signalling | Configurable in accordance with NAMUR NE 043 downscale ≤ 3.6mA upscale ≥ 21.0mA |
| Current value for sensor short-circuit | Not configurable in accordance with NAMUR NE 043 downscale ≤ 3.6mA |
| Communication | |
| Info data | Tag no., description and user message can be stored in transmitter |
| Configuration and calibration data | Permanently stored |
| Configuration software | WIKAsoft-TT → Configuration software (multilingual) as a download from www.wika.com |
| Voltage supply | |
| Supply voltage U B | DC 10 ...30V |
| Supply voltage input | Protected against reverse polarity |
| Permissible residual ripple of supply voltage | 10 %generated by U B < 3 %ripple of the output current |
| Time response | |
| Switch-on delay, electrical | Max. 4 s (time before the first measured value) |
| Warm-up time | After approx. 4 minutes, the instrument will function to the specifications (accuracy) given in the data sheet. |
| Response time (per IEC 60751) | t 50 < 3.3 s t 90 < 9.7 s |
| Connection type | M12 x 1 circular connector (4-pin) |
|---|---|
| Material | Stainless steel 1.4404 |
| Pin | Signal | Description |
|---|---|---|
| 1 | L+ | 10 ...30V |
| 2 | VQ | not connected |
| 3 | L- | 0V |
| 4 | C | not connected |
| Operating conditions | |
|---|---|
| Ambient temperature range | |
| 4 ... 20 mAversion (models TR21-C-xTT, TR21-C-xTB) | -40 ...+85 °C [-40 ...+185 °F] |
| Pt100 (model TR21-C-xPx)/Pt1000 (model TR21-C-xRx) version | -50 ...+85 °C [-58 ...+185 °F] |
| Storage temperature range | -40 ...+85 °C [-40 ...+185 °F] |
| Climate class per IEC 60654-1 | |
| 4 ... 20 mAversion (models TR21-C-xTT, TR21-C-xTB) | Cx (-40 ...+85 °C [-40 ...+185 °F], 5 ... 95 %r.h.) |
| Pt100 (model TR21-C-xPx)/Pt1000 (model TR21-C-xRx) version | Cx (-50 ...+85 °C [-58 ...+185 °F], 5 ... 95 %r.h.) |
| Maximum permissible humidity, condensation | 100 %r.h., condensation allowed |
| Max. operating pressure | Dependent on particular process connection |
| Salt fog | IEC 60068-2-11 |
| Shock resistance per IEC 60068-2-27 | 50 g, 6 ms, 3 axes, 3 directions, three times per direction |
| Maximum permissible autoclaving conditions | Max.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 connected | IP67 per IEC/EN 60529 |
| Weight in kg | approx. 0.3 ... 2.5 (depending on version) |
| Logo | Description | Country |
|---|---|---|
| EU declaration of conformity | European Union | |
| UL - only for instrument version without explosion protection Safety (e.g. electr. safety, overpressure, ...) | USA and Canada |
| Logo | Description | Country |
|---|---|---|
| EU declaration of conformity ATEX directive Hazardous areas | European Union | |
| IECEx - in combination with ATEX Hazardous areas | International | |
| CSA | USA and Canada | |
| Class II / III, zone 20 or 21, Ex/AEx ia IIIC T135 °C Da EAC 1) | Eurasian | |
| EMCdirective Hazardous areas Zone 0 gas Zone 1 gas |
| Logo | Description | Country |
|---|---|---|
| Ex Ukraine Hazardous areas Zone 0 gas II 1G Ex ia IIC T6 ...T1 Ga Zone 20 dust II 1D Ex ia IIIC T135 °C Da Zone 1 mounting to zone 0 gas II 1/2G Ex ia IIC T6 ...T1 Ga/Gb Zone 21 mounting to zone 20 dust II 1/2D Ex ia IIIC T135 °C Da/Db Zone 1 gas II 2G Ex ia IIC T6 ...T1 Gb Zone 21 dust II 2D Ex ia IIIC T135 °C Db Zone 1 gas II 2G Ex ib IIC T6 ...T1 Gb Zone 21 dust II 2D Ex ib IIIC T135 °C Db Zone 1 mounting to zone 0 gas II 1/2G Ex ib IIC T6 ...T1 Ga/Gb Zone 21 mounting to zone 20 dust II 1/2D Ex ib IIIC T135 °C Da/Db | Ukraine | |
| 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/Gb Zone 20 dust Ex iaD 20 T135 Zone 21 dust Ex iaD 21 T135 Zone 21 mounting to zone 20 dust Ex iaD 20/21 T135 | China | |
| GOST Metrology, measurement technology | Russia | |
| KazInMetr Metrology, measurement technology | Kazakhstan | |
| - | MTSCHS Permission for commissioning | Kazakhstan |
| BelGIM Metrology, measurement technology | Belarus | |
| Uzstandard Metrology, measurement technology | Uzbekistan | |
| ® | 3-A 4) | USA |
| JANUARY 2019 TYPE EL CLASS I | EHEDG 4) Hygienic Equipment Design | European Union |
| Certificates | ■ 2.2 test report ■ 3.1 inspection certificate ■ DKD/DAkkS calibration certificate ■ Manufacturer's declaration regarding regulation (EC) 1935/2004 and (EC) 2023/2006 ■ Certificate of the surface roughness of wetted parts | |
|---|---|---|
| Hygienic certificates | 3-A approval | EHEDG approval |
| Clamp | Yes | Yes 2) |
| VARINLINE ® | Yes | Yes |
| NEUMOBioControl ® | Yes | No |
| Union nut DIN 11851 | Yes 1) | Yes 2) |
| Tapered hygienic threaded connections | No | No |
| Ingold connection | No | No |
| Hazardous gas atmosphere | Temperature class | Ambient 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 Gb | T6 | -40 ...+45 °C | T M (medium temperature) + self-heating (15 K) Pay attention to the special conditions for safe |
| T5 | -40 ...+60 °C | use. | |
| T4 | -40 ...+85 °C | ||
| T3 | -40 ...+85 °C | ||
| T2 | -40 ...+85 °C | ||
| T1 | -40 ...+85 °C |
| Hazardous dust atmosphere | Power P i | Ambient 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 Db | 750mW 650mW 550mW | -40 ...+40 °C -40 ...+70 °C -40 ...+85 °C | T M (medium temperature) + self-heating (15 K) Pay attention to the special conditions for safe use. |
| Parameters | Hazardous gas atmosphere | Hazardous dust atmosphere |
|---|---|---|
| Terminals | + / - | + / - |
| Voltage U i | DC 30V | DC 30V |
| Current l i | 120mA | 120mA |
| Power P i | 800mW | 750/650/550mW |
| Effective internal capacitance C i | 29.7 nF | 29.7 nF |
| Effective internal inductance L i | Negligible | Negligible |
| Maximum self-heating at the probe or protection tube tip | 15 K | 15 K |
| Marking | Temperature class | Ambient 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 Gb | T6 | -50 ...+80 °C -50 ...+85 °C | T M (medium temperature) + self-heating Pay attention to the special conditions for safe |
| T5 | use. | ||
| T4 | -50 ...+85 °C | ||
| T3 | -50 ...+85 °C | ||
| T2 | -50 ...+85 °C | ||
| T1 | -50 ...+85 °C |
| Marking | Power P i | Ambient 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 Db | 750mW 650mW 550mW | -50 ...+40 °C -50 ...+70 °C -50 ...+85 °C | T M (medium temperature) + self-heating Pay attention to the special conditions for safe use. |
| Parameters | Gas applications | Dust applications |
|---|---|---|
| Terminals | 1 - 4 | 1 - 4 |
| Voltage U i | DC 30V | DC 30V |
| Current l i | 550mA | 250mA |
| Power P i | 1,500mW | 750/650/550mW |
| Effective internal capacitance C i | Negligible | Negligible |
| Effective internal inductance L i | Negligible | Negligible |
| Maximum self-heating at the probe or protection tube tip | (R th ) = 335 K/W | (R th ) = 335 K/W |
| Process connection | Nominal width in mm/inch | PN in bar | Dimensions inmm | Weight in kg | |
|---|---|---|---|---|---|
| Ø D | l 2 | ||||
| DIN 32676 for pipes per DIN 11866 row A 1) | DN 10 ... 20 | 25 | 34.0 | 6.35 | 0.2 |
| DN 25 ... 40 | 25 | 50.5 | 6.35 | 0.3 | |
| DN 50 | 16 | 64.0 | 6.35 | 0.4 | |
| DIN 32676 for pipes per DIN 11866 row B | 13.5 ... 17.2 | 25 | 25.0 | 4.75 | 0.2 |
| 21.3 ... 33.7 | 25 | 50.5 | 6.35 | 0.3 | |
| 42.4 ... 48.3 | 16 | 64.0 | 6.35 | 0.3 | |
| DIN 32676 for pipes per DIN 11866 row C | ½" ...¾" | 25 | 25.0 | 4.75 | 0.2 |
| 1" ... 1 ½" | 25 | 50.5 | 6.35 | 0.3 | |
| 2" | 16 | 64.0 | 6.35 | 0.4 | |
| TRI-CLAMP® | ½" ...¾" | 13.8 | 25.0 | 4.75 | 0.2 |
| 1" ... 1 ½" | 13.8 | 50.5 | 6.35 | 0.3 | |
| 2" | 13.8 | 64.0 | 6.35 | 0.4 | |
| 2 ½" | 13.8 | 77.5 | 6.35 | 0.5 | |
| 3" | 13.8 | 91.0 | 6.35 | 0.6 | |
| 4" | 13.8 | 119.0 | 6.35 | 0.8 |
| Process connection | Nominal width inmm | PN in bar | Dimensions inmm | Weight in kg | |||
|---|---|---|---|---|---|---|---|
| Ø D | Ø d | H | h | ||||
| Form B | DN 10, DN 15 | 25 | 31 | 52.7 | 20 | 13.65 | 0.3 |
| Form F | DN 25, DN 32 | 25 | 50 | 66.0 | 18 | 12.30 | 0.4 |
| Form N | DN 40, DN 50 | 25 | 68 | 84.0 | 18 | 12.30 | 0.6 |
Couldn't find the answer in the documentation? An engineer will reply within a business day.
Ask an engineer →223 standard articles of family TR21_C
If you know the code — pick directly. If not — use the configurator in mode “01”.
