Endress+Hauser TM152 iTHERM Imperial Barstock Thermometer

Endress+Hauser TM152 imperial barstock thermometer, ASME and NPT

The Endress+Hauser TM152 is the imperial-dimension version of the iTHERM ModuLine barstock thermometer. The datasheet describes it as an imperial RTD or thermocouple thermometer with a barstock thermowell, for universal use, with a measuring range of –200 to +1,100 °C and pressure up to 500 bar (7,252 psi). Where the metric TM151 follows DIN and ISO threads, the TM152 follows US practice: NPT threads, inch immersion lengths and ASME B16.5 flanges.

Seven Star LLC supplies the TM152 in Oman and the GCC as an independent supplier in Muscat. In this region many plants were engineered to API and ASME standards, so the TM152 is often the cleaner fit for replacement of existing inch-dimension thermowells and for projects that carry US-style piping specifications.

TM152 technical specifications

How the TM152 thermowell is built and sized

The thermowell is drilled from barstock, with a straight, tapered or stepped profile defined in inch dimensions. The datasheet lists pre-defined geometries that combine the thermowell standard, the process connection and the wetted-part shape; one example is a 7/8 in (22.23 mm) root with a tapered 5/8 in tip and a 6.6 mm bore on a flanged NPT 1/2 connection, so a standard shape can often be used instead of a custom well. Variables in the drawings are the immersion length U, lagging length T, neck length E, total length L and the bottom thickness B, which defaults to 6.35 mm (0.25 in).

Thermowell strength depends on flow velocity, vortex shedding, pressure and temperature, so every installation should be calculated. The manufacturer provides a thermowell sizing module in its online applicator; the datasheet cites it. Do not skip the check on gas, steam and high-velocity lines, because long wells in fast flow are where resonance risk is highest.

TM152 process connections, flanges and options

• NPT threaded thermowells in half-inch to one-and-a-half-inch sizes, with wrench-flat sizes stated per size
• ASME B16.5 flanges, with raised-face height of 1.6 mm for class 150 and 300 and 6.4 mm from class 600
• Socket-weld and weld-in versions based on NPS pipe sizes, up to 500 bar
• iTHERM TwistWell thermowell with flange as a separate configuration
• Extension neck with fixed or iTHERM QuickNeck design; second process seal (Dual Seal) as an option

The head side is common to the whole range: terminal heads to DIN EN 50446 with M24x1.5 or 1/2 NPT thread, aluminium or stainless, with a transmitter, display or M12 plug as options.

TM152 and TM151: choosing between imperial and metric

The two share their electronics and inserts, so the choice follows your piping standard, not performance. Spares such as inserts are specified by insertion length rather than model alone.

Selection and ordering checklist for the TM152

• Line size (NPS), schedule and flange class and facing, or NPT size
• Design pressure and temperature, medium and flow velocity
• Thermowell profile, root and tip diameter, bore, immersion length in inches
• Thermowell material and certificate requirements
• Sensor: Pt100 class AA or A, or thermocouple K, J or N; single or dual
• Neck: fixed or QuickNeck; Dual Seal if required
• Head, display, transmitter protocol and hazardous-area classification
• Calibration certificate and traceability level

Installation, commissioning and maintenance of the TM152

Seal NPT threads with a compound suitable for the temperature, and do not over-torque a conical thread, because the thread is also a pressure boundary. Flanged wells should be installed with the gasket and bolt specification of the line. After the pipework test, fit the insert, check that spring pre-load seats the tip on the bottom of the bore, and wire the loop.

During service, a replaceable insert can be swapped without opening the line. Re-calibrate in a block calibrator or bath, with the insert immersed deeper than the minimum immersion length stated for the calibration temperature. Quote the unit serial number for spares, as the insertion length is derived from it.

TM152 applications in Oman and the GCC

The TM152 is the natural choice in plants built to American practice: gas processing and compression, crude stabilisation and export, refineries, LNG and downstream petrochemicals, power plants, and utilities using ASME piping. Hot desert days and salty air call for stainless heads and sealed entries, and the high pressure rating covers gas lift and injection headers as well as steam. For retrofit work the inch geometry lets a replacement thermowell match existing bores and flanges.

Information to send with a TM152 request for quotation

• Tag, service, P&ID and quantity
• Pressure class, design temperature, medium and flow velocity
• Connection standard, size, class and facing
• Thermowell profile, material, bore and immersion length (inches)
• Sensor type and accuracy; calibration certificate
• Head, transmitter, protocol, hazardous-area zone
• Required material and test certificates; delivery site

Documents and quotation

The manufacturer technical information for the TM152 is attached to this page. Read it together with your project specification, because the thermowell, sensor, head and transmitter options that apply to your tag are fixed by the order configuration, not by the model name alone. Approvals and ratings should always be checked against the exact configuration that is quoted.

Seven Star LLC quotes against your data sheet or loop drawing and confirms lead time, stock position and the documents that ship with the instrument. Send us the details listed above and we will respond with a priced offer for delivery in Oman and the wider GCC.