WIKA TR10-B Resistance Thermometer for Thermowell

WIKA TR10-B resistance thermometer for an additional thermowell

The WIKA TR10-B is a resistance thermometer designed to be fitted into a thermowell that is ordered or already installed separately. It is the practical choice when the plant standard is a particular thermowell design, when the thermowell must be machined from bar stock for high pressure or velocity, or when the sensor needs to be removable without opening the process. WIKA gives a sensor range of -196 … +600 °C [-320 … +1,112 °F] and offers Pt100 or Pt1000 elements. Seven Star LLC supplies the TR10-B in Oman and the GCC as an independent supplier in Muscat, and this page covers the options that have to be fixed before a quotation is possible.

How the TR10-B is built

A TR10-B is assembled from a replaceable spring-loaded measuring insert, a neck tube and a connection head. The neck tube takes the place of a protection tube: it threads into the head on one side and carries the connection to the thermowell on the other, and its length bridges any insulation and keeps a built-in transmitter away from hot process heat. Because the maker lists so many combinations of sensor, head, insertion length, neck length and thermowell connection, the model fits nearly any thermowell dimension. WIKA notes that operation without a thermowell is only recommended for certain applications.

TR10-B technical specifications

Neck tube, thread and connection choices for the TR10-B

The neck is the part that makes the TR10-B different from a threaded model. WIKA lists the DIN 43772 neck tube in 12 x 1.5 mm, 12 x 2.5 mm and 14 x 2.5 mm, with threads such as G½ B, G¾ B, G¼ B, M20 x 1.5 and M18 x 1.5, compression fittings with metal ferrule, a union nut or a male nut, or a plain tube without thread. A 14 x 2.5 mm tube with counter nut offers ½ NPT and ¾ NPT for US-style thermowells. The double-threaded hex bushing (G¼ B, G½ B or G¾ B to M24 x 1.5 or ½ NPT) gives a short, rigid neck, and the 316 “nipple-union-nipple” (about 22 mm, ½ NPT both ends) allows the head to be turned or the insert withdrawn easily.

Accuracy, wiring and vibration data

The same IEC 60751 tolerance classes apply as on the other TR10 models: Class B is ±(0.30 + 0.0050 |t|), Class A is ±(0.15 + 0.0020 |t|) and Class AA is ±(0.10 + 0.0017 |t|) in °C, each valid over a defined range. Class A and AA require a 3- or 4-wire circuit, and WIKA advises 4-wire for longer assemblies.

Vibration data in the datasheet refer to the tip of the insert and are tested per IEC 60068-2-6. A standard tip withstands up to 3 g amplitude (6 g peak-to-peak), a vibration-resistant tip 10 g (20 g peak-to-peak), a highly vibration-resistant tip 25 g (50 g peak-to-peak), and an extremely vibration-resistant tip 50 g (100 g peak-to-peak), the last one only for the 6 mm insert. This matters on pump skids, compressor casings and fan ducts, where a standard tip can fatigue.

Connection heads, transmitters and displays

Head options include the BSZ, BSZ-H, BSS, BSS-H and BVS aluminium or plastic versions with M20 x 1.5 or ½ NPT entries, the stainless steel BVS and the screw-lid KN4 type, normally IP65. Cable glands in plastic, nickel-plated brass or stainless steel are available, and the datasheet gives the allowed cable diameters. The T15 and T38 transmitters from WIKA can be mounted in the head cover (preferred) or on the insert. The T38 supports redundancy with dual sensors and the True Drift Detection option with a combined RTD/thermocouple 6 mm probe, error signalling per NAMUR NE043. Selected assemblies with a TUV-certified T38 support SIL applications, and WIKA suggests two TR10-B probes for SIL 3.

Fitting a TR10-B into the thermowell

Match the insert length to the thermowell: the insertion length equals the thermowell length for tip thickness up to 5.5 mm, and the bore should be no more than 1 mm larger than the insert diameter. Gaps over 0.5 mm slow the response. The spring must press the tip onto the bottom of the well. Before commissioning, check the head orientation, tighten the gland, fit the lid gasket and test the loop. Because the insert can be replaced without opening the process, calibration and swap-outs are quick, and a stock of inserts per diameter and length shortens downtime.

Where the TR10-B is used in Oman and the GCC

WIKA lists machine building, plant and vessel construction, energy and power plants, chemical, food and beverage, and heating and air-conditioning technology as applications. In the region this means steam and condensate lines, boiler feed and lube-oil temperature on turbines, heat-exchanger inlets and outlets in refineries and petrochemical units, and cooling-water systems in desalination and district cooling. The thermowell can be chosen in a heavier material or machined design for hot, abrasive or high-flow media, while the TR10-B above it stays standard and easy to replace, which is useful in hot, dusty sites where maintenance windows are short.

TR10-B selection and ordering checklist

• Thermowell drawing or standard (diameter, bore, length, connection) the insert must fit
• Insert diameter, Pt100 or Pt1000, class and wire method
• Neck tube design, thread and neck length
• Head type, cable entry, gland and ingress rating
• Transmitter or display, output signal and any SIL need
• Vibration level at the tip and the probe-tip variant needed
• Hazardous-area zone, gas or dust group and approval type

Information to send with an RFQ

Please send the tag, the process temperature and pressure, the thermowell details, the complete TR10-B configuration, quantity and approvals. If the thermowell is not yet bought, tell us the medium and line size and we can discuss it with you before the quotation.

Documents and quotation

The WIKA data sheet TE 60.02 for the TR10-B is attached on this page. Send the configuration and quantity, and we will reply with a quotation as an independent supplier in Muscat.