WIKA TR33 Miniature Resistance Thermometer
Overview
WIKA TR33 is a compact, miniature resistance thermometer purpose-built for OEM and machine-building applications where space is tight and vibration resistance is critical. Housed in a rugged, all-welded stainless steel body with an integral M12 x 1 circular connector, the WIKA TR33 packs a Pt100 or Pt1000 sensing element into a slim 3 mm or 6 mm diameter probe rated up to 270 bar, with an optional integrated 4–20 mA transmitter for direct digital output at the measurement point. This makes the WIKA TR33 a natural fit for hydraulic power units, mobile machinery, and propulsion systems across Oman’s industrial and marine sectors, where a bulky head-mounted thermometer simply will not fit.
With engineering support in Muscat, Seven Star LLC supplies the WIKA TR33 miniature 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 OEM manufacturers and machine builders in Muscat, Sohar, and Salalah.
Measurement Principle
The WIKA TR33 operates on the standard resistance thermometry principle set out in IEC 60751: a Pt100 or Pt1000 platinum element changes resistance in a precise, repeatable relationship as its temperature rises or falls. The sensing tip, mounted at the base of the probe body, is screwed directly into the process without a separate thermowell in most applications, giving a fast, direct thermal response that is well suited to compact hydraulic and pneumatic circuits where response time matters more than serviceability. Because the element is factory-calibrated to Class A accuracy, the TR33 delivers dependable, drift-resistant readings over long operating periods without requiring frequent recalibration.
Because the platinum sensing element has no moving parts, the WIKA TR33 introduces zero mechanical wear, zero pressure drop into the fluid circuit, and no contamination risk to the process medium under normal operation. This solid-state design, combined with the TR33’s rated vibration resistance of up to 20 g, is precisely what allows it to be mounted directly onto pumps, gearboxes, and hydraulic manifolds subject to continuous mechanical shock without measurement drift or premature sensor failure.
Engineering Design of the WIKA TR33
Physically, the WIKA TR33 is built as a single, all-welded stainless steel probe body screwing directly into the process via a fixed threaded connection, available in either a 3 mm diameter rated to 140 bar or a 6 mm diameter rated to 270 bar, letting specifiers match probe strength to system pressure. The compact housing terminates in an M12 x 1 circular electrical connector as standard, with an optional angled connector adapter available where cable routing space around the mounting point is restricted — a common constraint in mobile hydraulic equipment and compact gearbox housings.
An optional integrated transmitter converts the raw Pt100/Pt1000 resistance signal into a 4–20 mA current-loop output directly within the probe body, and this transmitter is individually parameterizable using WIKA’s free WIKAsoft-TT configuration software, allowing the measuring range to be matched to the specific application without ordering a custom part number. With an IP67 or IP69K ingress protection rating, the TR33 withstands high-pressure washdown and outdoor exposure, making it equally suitable for enclosed machine cabinets and exposed mobile equipment mounting points across Oman’s industrial and marine operating environments.
Key Features
The WIKA TR33 miniature resistance thermometer delivers precision temperature sensing in a footprint built for OEM integration.
- A slim 3 mm or 6 mm diameter probe body allows the WIKA TR33 to be installed in tight OEM assemblies where a standard head-mounted RTD will not fit.
- Class A accuracy per IEC 60751 ensures dependable, repeatable temperature readings across the −50°C to +250°C measuring range.
- An optional integrated 4–20 mA transmitter, configurable with free WIKAsoft-TT software, delivers a ready-to-use analog output at the measurement point.
- Pressure ratings up to 270 bar on the 6 mm variant make the TR33 suitable for high-pressure hydraulic and pneumatic circuits.
- A standard M12 x 1 circular connector, with an optional angled adapter, simplifies cabling in space-constrained machine housings.
- IP67/IP69K ingress protection allows reliable operation in washdown environments and exposed mobile equipment applications.
- A rated vibration resistance of up to 20 g supports direct mounting on pumps, gearboxes, and rotating machinery without measurement drift.
- All-welded stainless steel construction resists corrosion in humid coastal and marine environments typical of Gulf industrial and port facilities.
Industrial Applications
The WIKA TR33 is widely specified in machine building, mobile hydraulics, propulsion technology, and plant and vessel construction across the region, wherever a compact, vibration-resistant RTD is needed directly on rotating or reciprocating equipment. Its slim profile and high pressure rating make it well suited to hydraulic power units on port cranes and material-handling equipment in Sohar and Salalah, as well as on pumps and compressors feeding district cooling plants and commercial HVAC systems across Muscat, where space inside the equipment skid is at a premium. Marine and offshore support vessel operators across Oman also specify the TR33 for engine and propulsion monitoring, valuing its rugged, all-welded construction and IP69K-rated resistance to washdown and salt-spray exposure.
With manufacturer documentation, Seven Star LLC supplies the TR33 miniature resistance thermometer to OEM manufacturers, machine builders, and industrial contractors throughout Oman, the wider GCC, and specifically within the Sohar and Salalah economic zones, where hydraulics, marine, and heavy-equipment sectors depend on reliable instrumentation supply. Hospitality developments and hospital complexes across Muscat also rely on TR33-class miniature RTDs within compact HVAC and utility skid packages, where floor space and equipment footprint are tightly constrained. Sourcing through Seven Star LLC ensures buyers in the region receive authentic WIKA hardware with full warranty coverage and responsive local technical support.
Technical Specifications
The table below summarizes the core specifications of the WIKA TR33 miniature resistance thermometer as supplied by Seven Star LLC.
| Parameter | Specification |
|---|---|
| Model | WIKA TR33 |
| Sensor Type | Pt100 or Pt1000 resistance thermometer |
| Measuring Range | −50°C to +250°C (−58°F to +482°F) |
| Accuracy Class | Class A per IEC 60751 |
| Wiring Configuration | 2-, 3-, or 4-wire |
| Sheath Diameter / Pressure Rating | 3 mm (140 bar) or 6 mm (270 bar) |
| Electrical Connection | M12 x 1 circular connector (angled adapter optional) |
| Output Signal | Direct RTD resistance, or 4–20 mA via optional integrated transmitter |
| Ingress Protection | IP67 / IP69K |
| Vibration Resistance | Up to 20 g (configuration dependent) |
| Typical Applications | Machine building, mobile hydraulics, propulsion technology, plant & vessel construction |
Request a Quote for WIKA TR33 Miniature Resistance Thermometer
Seven Star LLC invites OEM manufacturers, machine builders, and industrial contractors across Oman and the GCC to submit a formal RFQ for the WIKA TR33 miniature resistance thermometer. 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, including transmitter configuration and connector selection. Contact Seven Star LLC today to discuss your project requirements and receive a competitive, locally supported quotation.
Browse the full WIKA range or see more Temperature Instrumentation products supplied by Seven Star LLC in Oman and the GCC.
- Datasheet WIKA TR33 Miniature Resistance Thermometer Datasheet Download
WIKA pressure and temperature models listed
WIKA identifies mechanical instruments by model number:- Bourdon tube pressure gauges: 111.10 and 212.20 for general duty, 213.53 liquid-filled, 232.50 in stainless steel
- Differential pressure: 732.51 gauge and DPGT43 with output signal
- Electronic pressure: UPT-20 process transmitter and CPG1500 precision digital gauge
- Bimetal thermometers: TG54, A52 and model 55
- Electrical temperature: TR12-B and TR33 resistance thermometers and the TC10-B thermocouple for thermowell mounting
Where WIKA instruments are used
WIKA pressure gauges and thermometers give local indication on pumps, vessels, headers and skids in refineries, gas plants, power stations, water treatment and machine building throughout the GCC. Stainless steel gauges such as the 232.50 are specified for corrosive atmospheres and process media, and liquid filling is chosen where vibration or pulsation is present. Transmitters and resistance thermometers feed the control system.Ordering WIKA instruments: what we need
For WIKA pressure gauges send the model, nominal size (for example 63, 100 or 160 mm), scale range and unit, process connection thread and its position (lower or back mount), wetted material and any filling, and accessories such as a diaphragm seal or contacts. For thermometers and probes add stem or insertion length, stem diameter, sensor type and class, and thermowell details. A photo of the dial and of the label on the case usually answers most of these points.Browse WIKA products by category: Pressure Instrumentation, Temperature Instrumentation.
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