Start by deciding whether the required value is the pipe surface temperature or the temperature at a process point inside the line. Surface and process temperatures can differ with the pipe, insulation, ambient conditions, flow and installation. Ask where the point sits, what access is available, whether the line can accept the intended mounting, and how the sensor signal will reach the instrument. Also describe the required response and the method used to check the reading. Note whether the line is accessible from outside and whether the point must remain measurable during maintenance.
The catalogue includes the curved-plate WP-73 Thermocouple for Pipe Temp Measurement, listed with K, J, T and RTD choices, grounded or ungrounded (isolated) junctions, SS304 or SS316 sheath options, and dimensions according to the requirement. WP-73 is a pipe-surface contact format. For a surface measurement, compare the curved plate with the pipe geometry and available contact area; if the required point is inside the line, specify an inserted assembly and check its product record separately.
The WP-77 Jubilee-clip thermocouple is also listed for pipe-surface measurement, with J or K choices, grounded or ungrounded junctions, listed sheath options and a Jubilee-clip mounting approach. The WP-73 and WP-77 pages document external surface-contact formats, not inserted mounting. A separate threaded fixed-plug listing documents liquid and immersion as well as pipe, tank and vessel measurement; check its listed construction and dimensions against the intended point rather than assuming a surface format can measure inside the process. Browse the surface temperature sensor family for other listed surface formats.
Selection should keep the measurement objective separate from assumptions about the process boundary. Provide pipe location, surface access, process conditions, mounting space, response requirement, cable route and instrument input. If an inserted assembly is being considered, include the intended connection and insertion dimensions so that its suitability can be assessed. State whether the requested value is surface or process temperature and how the reading will be used. Include the existing sensor type and termination for replacement requests; a pipe sketch can show the contact position, access direction and available cable space.