Brand: WIKA

WIKA TR12-B Process Resistance Thermometer

Name: WIKA TR12-B RTD Resistance Thermometer – Manual & Quote
Brand: WIKA

Description

Overview

WIKA TR12-B is a modular process resistance thermometer engineered for demanding temperature measurement in chemical, petrochemical, offshore, and heavy plant construction environments. Built around a spring-loaded, field-replaceable Pt100 measuring insert with extended spring travel, the TR12-B pairs with a wide range of thermowell designs to give plant engineers a serviceable, mechanically robust RTD assembly that can be maintained without shutting down the process line. Its modular design — separate measuring insert, connection head, and neck tube – is exactly the kind of long-service-life architecture that Gulf refineries, petrochemical crackers, and offshore platforms depend on when unplanned downtime carries a real commercial cost.

With engineering support in Muscat, Seven Star LLC supplies the TR12-B resistance thermometer to industrial buyers across the Sultanate of Oman and the wider GCC. Every unit we supply is a WIKA product provided with manufacturer documentation and local technical support for plants in Muscat, Sohar, and Salalah that cannot risk substandard instrumentation on regulated process lines.

Measurement Principle

The WIKA TR12-B measures temperature using the well-established resistance thermometry principle: a platinum resistance element (Pt100) changes its electrical resistance in a highly predictable, near-linear relationship with temperature, as standardized in IEC 60751. As the sensing tip absorbs heat from the process fluid or vessel wall, the platinum wire’s resistance rises proportionally, and the connected transmitter or indicator converts that resistance value into a precise, repeatable temperature reading. Because platinum RTDs offer superior long-term stability and accuracy compared with thermocouples, the TR12-B is the preferred choice wherever tight process control and calibration repeatability outweigh the need for extreme temperature range.

The spring-loaded measuring insert is a key operating advantage: constant spring pressure holds the sensing tip firmly against the base of the thermowell, minimizing air gaps and response-time lag while allowing the insert to be withdrawn and replaced without removing the thermowell from the process. In practice this means zero pressure drop, zero contamination risk to the process medium during sensor replacement, and no need to break process containment for routine maintenance — a critical safety and uptime benefit on live petrochemical and offshore systems where isolating a thermowell for service is costly and time-consuming.

Engineering Design of the WIKA TR12-B

Physically, the WIKA TR12-B is built from three interchangeable sections: the measuring insert (the Pt100 sensing element on a mineral-insulated or wire-wound support), the neck tube connecting it to the head, and the connection head itself, available in multiple explosion-protected and weatherproof housing variants to suit hazardous-area classification requirements. The insert is dimensioned to WIKA’s standard insert lengths so it drops directly into compatible thermowells from WIKA’s own range or from third-party thermowell manufacturers already installed on existing process vessels, simplifying retrofits and spare-parts standardization across a plant.

The connection head accepts standard cable gland or conduit entries and terminates the Pt100 element to a terminal block for wiring in 2-, 3-, or 4-wire configuration, with 4-wire connection recommended wherever lead-wire resistance error must be eliminated for high-accuracy loops. Optional integral transmitters can be fitted inside the head to convert the resistance signal directly to a 4–20 mA or HART output at the measurement point, reducing cable runs and signal degradation on long transmission distances typical of large industrial sites. Explosion-protected head variants (Ex d, Ex e) extend the TR12-B’s suitability into classified hazardous areas found throughout Oman’s upstream and downstream oil and gas facilities.

Key Features

The WIKA TR12-B resistance thermometer delivers the reliability and serviceability that process engineers expect from a field-proven RTD platform. Below, the WIKA TR12-B key features are summarized for quick specification reference.

The spring-loaded, field-replaceable Pt100 measuring insert allows sensor replacement without removing the thermowell, eliminating process shutdowns for routine maintenance.
Class A and Class B accuracy options to IEC 60751 give plant engineers the flexibility to specify tighter tolerance only where the process loop genuinely requires it.
A modular head-and-insert architecture standardizes spare parts across multiple installation points, reducing inventory complexity for maintenance teams.
Explosion-protected connection head options (Ex d, Ex e) make the TR12-B suitable for classified hazardous areas common in refineries and offshore platforms.
Compatibility with a broad range of thermowell designs, including standard, tapered, and flanged variants, simplifies integration into existing process vessels and piping.
Optional integral 4–20 mA / HART transmitter heads convert the raw resistance signal at the measurement point, improving signal integrity over long cable runs.
Robust stainless steel construction throughout the wetted and non-wetted parts resists corrosion in humid coastal and marine environments typical of Gulf industrial zones.
Full traceable calibration certification is available on request, supporting quality-management and regulatory documentation requirements for regulated industries.

Industrial Applications

Across the region, the WIKA TR12-B is a preferred choice among specifiers. The WIKA TR12-B is deployed extensively across chemical processing, petrochemical refining, offshore oil and gas platforms, and heavy plant and vessel construction, wherever a serviceable, thermowell-mounted RTD is needed on pipework, reactors, storage tanks, or heat-exchanger loops. Its modular, field-replaceable insert design is particularly valued on continuous-process lines in district cooling plants, commercial HVAC chiller loops, and RO desalination systems across the region, where an unplanned shutdown to replace a failed temperature sensor carries a real production and revenue cost. Pharmaceutical and light-industrial manufacturers operating in Oman’s growing industrial zones also specify the TR12-B where calibration traceability and IEC 60751 accuracy classes are part of their quality documentation.

With manufacturer documentation, Seven Star LLC supplies the TR12-B resistance thermometer to project contractors, EPC firms, and plant operators throughout Oman, the wider GCC, and specifically within the Sohar and Salalah economic zones, where petrochemical, metals, and logistics facilities require dependable supply and technical support. Hospitality developments and hospital complexes across Muscat also rely on TR12-B-class RTDs within their building-management and process-utility systems, where accuracy and long-term stability directly affect energy efficiency and comfort control. Our regional presence means technical support in-country rather than routed through a distant overseas distributor.

Technical Specifications

The table below summarizes the core specifications of the WIKA TR12-B process resistance thermometer as supplied by Seven Star LLC. Every WIKA TR12-B unit is tested prior to dispatch to confirm it meets the specified accuracy class.

Parameter	Specification
Model	WIKA TR12-B
Sensor Type	Platinum resistance thermometer, Pt100
Accuracy Class	Class A / Class B per IEC 60751
Insert Type	Spring-loaded, field-replaceable measuring insert
Wiring Configuration	2-, 3-, or 4-wire
Connection Head	Standard, Ex d, and Ex e explosion-protected variants
Output Signal	Direct RTD resistance, or 4–20 mA / HART with optional integral transmitter
Thermowell Compatibility	Standard, tapered, and flanged thermowell designs
Wetted / Sheath Material	Stainless steel
Typical Applications	Chemical, petrochemical, offshore, plant & vessel construction

Request a Quote for WIKA TR12-B Process Resistance Thermometer

Seven Star LLC invites engineers, procurement teams, and EPC contractors across Oman and the GCC to submit a formal RFQ for the WIKA TR12-B process resistance thermometer today. The WIKA TR12-B is available for quotation on request. Working closely with plant engineers in the region, we supply on request with lead time confirmed at quotation, provide full technical datasheets on request, and connect customers directly with our instrumentation division for application engineering support — from thermowell selection to hazardous-area classification. Contact Seven Star LLC today to discuss your project requirements and receive a competitive, locally supported quotation.

Reviews

There are no reviews yet.

How would you rate this product?

About brand

WIKA is the German manufacturer of pressure, temperature, level and flow instruments, best known for its pressure gauges. Alexander Wiegand and Philipp Kachel founded it on 2 January 1946 in Klingenberg am Main, Bavaria. The name comes from the first two letters of their surnames. WIKA is still run by the Wiegand family and is headquartered in Klingenberg.

Seven Star LLC is an independent supplier in Muscat. We list WIKA pressure gauges, diaphragm seals, transmitters, switches, thermometers and thermowells, and supply them to plants, contractors and panel builders in Oman and the GCC by model and order code.

WIKA company profile

Established	2 January 1946, Klingenberg am Main, Germany, by Alexander Wiegand and Philipp Kachel
First products	Mechanical pressure and temperature gauges
Ownership	Family-owned; managed by Alexander Wiegand, grandson of the founder, since 1996
Product families	Pressure gauges, diaphragm seals, pressure transmitters and switches, thermometers, RTDs, thermocouples, thermowells, calibration equipment, level and flow instruments

Milestones

1946: Alexander Wiegand and Philipp Kachel found the company in Klingenberg am Main on 2 January; pressure gauge production starts at the end of the year. The name WIKA comes from the first letters of their surnames.
1951: Konrad Wiegand, the founder's son, takes over management.
1967: Ursula Wiegand leads the company after her husband's death.
1986: The company is reunited with the Kachel thermometer factory, which Philipp Kachel had set up after leaving in 1956.
1994: Certification to DIN ISO 9001.
1996: Alexander Wiegand, the founder's grandson, becomes head of the company.

WIKA products we list

Family	Models	Typical use
Bourdon tube pressure gauges	111.10, 111.12, 212.20, 213.53, 232.50, 233.50, 232.30/233.30 safety pattern	HVAC and utilities (111 series) to process plants (23x series in stainless steel)
Diaphragm and differential pressure gauges	432.50, 732.51, 700.01, DPGT43	Low pressures, viscous or dirty media, and filter differential pressure
Diaphragm seals	990.10, 990.27	Separating the gauge from corrosive, hot or clogging media
Transmitters, switches and test gauges	A-10, UPT-20, PSM01, CPG1500	4-20 mA pressure signals, switching, and precision calibration checks
Thermometers	TG54, Model 55, A52, 73 gas-actuated	Local temperature indication on pipes, vessels and HVAC
Temperature sensors and thermowells	TR10, TR12-B, TR33, TC10-B, TW10 flanged, TW15 threaded	RTD and thermocouple measurement in process lines

The WIKA model number tells you the build. In 232.50, the first digit 2 means stainless steel wetted parts, the second digit 3 means a liquid-fillable case, and ".50" is the case style. The 111 series uses copper alloy wetted parts and suits water and air. Where the medium is corrosive, very hot or would block the gauge, a diaphragm seal such as the 990.27 keeps it away from the Bourdon tube. For temperature, a thermowell like the TW10 lets you remove the sensor without opening the process.

Where WIKA instruments are used

In Oman and the GCC, WIKA gauges, transmitters and thermometers are used in oil and gas, refining and petrochemical plants, power and desalination, water networks, district cooling and HVAC, and on skids and machines from OEMs.

Ordering WIKA instruments: what we need

Send the model, dial size (for example 63, 100 or 160 mm), range and unit, connection size and position (lower or back mount), accuracy class and whether liquid filling is needed. For diaphragm seals and thermowells, add the process connection, materials and insertion length.

Facts checked against WIKA company history, October 2026.

Browse WIKA products by category: Pressure Instrumentation, Temperature Instrumentation.

Frequently Asked Questions

What makes the WIKA TR12-B different from a standard fixed RTD probe?

The TR12-B uses a spring-loaded, field-replaceable measuring insert, so the Pt100 sensing element can be swapped out for maintenance or calibration without removing the thermowell from the process, avoiding a full shutdown.

Does installing the TR12-B require significant downtime or pipework modification?

No. Because the insert drops into an existing or newly installed thermowell, the process connection is made once, and future sensor servicing takes only minutes with no need to break containment or drain the line.

What thermowell and process connection types is the TR12-B compatible with?

The TR12-B measuring insert is dimensioned to standard WIKA insert lengths and fits standard, tapered, and flanged thermowell designs, including many third-party thermowells already installed in existing plant piping.

Can the TR12-B integrate with existing 4-20 mA or HART control systems?

Yes. An optional integral transmitter can be fitted inside the connection head to convert the raw Pt100 resistance signal to a 4-20 mA or HART output directly at the measurement point, simplifying integration with legacy and modern DCS/PLC systems alike.

Is Seven Star LLC an experienced supply partner for WIKA products?

Yes. Seven Star LLC is an experienced supplier of WIKA in Oman and the GCC, supplying genuine instruments with manufacturer documentation and local technical support.

+968 90155212