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Brand: WIKA
WIKA TC90 High-Pressure Thermocouple
Description
WIKA TC90 high-pressure thermocouple for compressed gases and polymer lines
The WIKA TC90 is a thermocouple built to sit directly in a high-pressure medium without a thermowell. Its slim 2 mm probe is sealed into the vessel or line with metal-to-metal sealing, a high-pressure threaded connection or a lens-type sealing ring, so the pressure is contained by the sensor itself. It was developed for plastics production (LDPE and EVA), hydrogen refuelling stations, hydrogen test benches and other compressed-gas applications. Each TC90 is designed to the customer’s specification. Seven Star LLC supplies the TC90 in Oman and the GCC as an independent supplier in Muscat; this page explains the version codes and the information needed for a high-pressure quotation.
TC90 versions and what the suffix means
| Version | Process connection | Pressure and use |
|---|---|---|
| TC90-xxxx-A | Sealing contour and thread (sealing bolt 58 degrees), with or without pressure ring and male nut, or with anti-vibration gland | Up to 4,500 bar, high-pressure LDPE and EVA |
| TC90-xxxx-B | Pressure flange; sealing bolt with radius and threads | To customer specification |
| TC90-xxxx-C | Lens-type sealing ring or sealing cone | High-pressure lines using lens-ring fittings |
| TC90-xxxx-H | Sealing cone without pressure ring, sealing bolt 58 degrees | Medium pressure up to 1,550 bar, hydrogen |
| TC90-xxxx-S | Sealing cone without pressure ring and male nut | Hydraulics |
The datasheet adds that individual versions can be tested at pressures up to a maximum of 5,400 bar, and that the instrument is produced with special manufacturing processes, special test arrangements and material tests to safeguard quality.
TC90 technical specifications
| Parameter | Specification |
|---|---|
| Manufacturer / part number | WIKA / TC90 (data sheet TE 65.90) |
| Type | High-pressure thermocouple, metal-to-metal sealing |
| Sensor types | K, J, E, T and N per IEC 60584-1 or ASTM E230 |
| Probe diameter | 2.0 mm [0.08 in] standard; others on request (3.0 mm shown for the -A version) |
| Probe material | Alloy 600 |
| Hot junction | Grounded (welded to the bottom of the probe) |
| Type K ranges | Class 2: -40 … +1,200 °C; Class 1: -40 … +1,000 °C |
| Process temperature, alloy 600 sheath | Up to 1,200 °C [2,192 °F] in air; actual limit set by the process, pressure and fittings |
| Sealing bolt / sealing ring materials | 1.4545, 1.4571, 2.4816, 316/316L; others on request |
| Male nut materials | 1.4545, 1.4542, 1.4404, 1.4401 |
| Support tube materials | 1.4571 or 316L |
| Thread examples | Male nut 9/16-18 UNF; pressure ring thread 1/4-28 UNF-LH or 3/8-24 UNF-LH |
| Storage temperature | -40 … +80 °C [-40 … +176 °F] |
| Calibration | Recommended interval one year, depending on use |
| Certificates | EU declaration of conformity; EN 61326 emission and immunity |
Why the maximum pressure is not the maximum temperature
Although the thermocouple types can reach 1,200 °C, the datasheet says the usable maximum in a high-pressure measurement is limited by the process conditions: material strength drops with temperature, so the allowed pressure drops as the medium gets hotter. For a customer-specific quotation WIKA requires the type and temperature of the medium and the temperature at the process connection. The same data is needed for us to quote, because a TC90 cannot be selected from pressure alone.
Sealing systems explained
The sealing bolt with a 58° cone seats in a matching female cone in the process nozzle and is pulled tight by a male nut; the lens-type ring seals on a spherical contact line; and a pressure flange follows the customer’s drawing. Each system needs a counterpart on the process side that is made to the same standard, so the first question is always which fitting is already on the line. The datasheet instructs users to follow the specified tightening torques on every threaded connection, and to check that the anti-vibration gland is used where pulsating pressure is present.
Hydrogen and compressed-gas service
Hydrogen refuelling stations and hydrogen test benches need fast response and a sealed, compact sensor. The TC90 is listed with short response times and a compact design with short insertion lengths, suited to small pipes. Hydrogen service adds material requirements (embrittlement, approved alloys), which should be discussed with the plant’s hydrogen specification before the material is chosen.
Explosion protection
An overview table covers Ex i for gas and dust, Ex e, Ex t and Ex NI options, with details on the approvals page of the datasheet. As with all thermocouple loops, the approval is tied to the complete assembly and cable, so state the zone and gas group.
Installation notes
- Prepare the process nozzle to the same standard as the sealing system, and clean the sealing surfaces
- Fit mechanically first and connect the cable second, to avoid twisting the probe leads
- Tighten to the torque in the datasheet, and re-check after the first pressure cycle
- Use an anti-vibration gland where the process pulsates
- Pressure-test with the site procedure, and keep personnel clear of the line during testing
Applications in Oman and the GCC
High-pressure thermocouples are relevant to polyethylene and polymer plants at Gulf petrochemical complexes, gas compression and injection systems, and new hydrogen pilot projects and refuelling stations. In these cases the combination of small bore access and extreme pressure is the reason for choosing a TC90 over a thermowell-mounted thermometer.
TC90 ordering checklist
- Version suffix (A, B, C, H or S) and the process fitting standard
- Maximum working pressure and test pressure
- Medium, temperature at the probe tip and at the process connection
- Thermocouple type and class, probe diameter and insertion length
- Materials for sealing bolt, nut and support tube
- Cable or connector details, hazardous-area marking and calibration
Information to send with an RFQ
Send a drawing or description of the process nozzle, the data above and the quantity. We then confirm the specification and any lead-time questions before quoting.
Documents and quotation
The WIKA data sheet TE 65.90 for the TC90 is attached on this page. Send us the specification and quantity for a quotation from Muscat as an independent supplier.
Other Models in the Wika Tc9x Range
Seven Star LLC supplies models from the Wika Tc9x range in Oman and the GCC. Compare the related models below and request a quote for the one that matches your application.
| Model | Category | |
|---|---|---|
| WIKA TC90 High-Pressure Thermocouple | Temperature Instrumentation | You are viewing this model |
| WIKA TC96-R Flex-R Flexible Multipoint Thermometer | Temperature Instrumentation | View details |
Datasheets & Documents
- Datasheet WIKA TC90 Datasheet Download
Reviews (0)
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.
FAQ
Questions about the WIKA TC90 High-Pressure Thermocouple
Answers from our engineering team on installation, compatibility and integration.
01What pressure can the TC90 withstand?
The version with sealing contour and thread (TC90-xxxx-A) is listed up to 4,500 bar, and individual designs can be tested to a maximum of 5,400 bar. Hydrogen versions are listed up to 1,550 bar.
02Does it need a thermowell?
No, it is built for high-pressure containment without a thermowell or protection tube, with the probe sealed directly into the process connection.
03What probe diameter is used?
The standard probe is 2.0 mm in diameter, with other diameters on request, and the probe material is alloy 600.
04Which thermocouple types are available?
Types K, J, E, T and N per IEC 60584-1 or ASTM E230, with a grounded hot junction.
05What data is required for a quotation?
The type and temperature of the medium, the temperature at the process connection, the working and test pressure and the sealing system standard.
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