Thermowells Solid Machined Threaded TWS “Quality Matters” Introduction A thermowell is a thermally conductive socket recommended to: • Protect the delicate instrument sensing element against corrosive effects. • Permit instrument interchange or calibration check without disturbing or closing down the process. Thermowells are available for high pressures, high temperatures and high velocity applications. Selected on the basis of pressure, temperature, flow, vibration and corrosion service parameters. F - Instrument connection It is usually a female thread axially aligned with the bore into which the instrument mounting threads or capillary bushing is screwed but other connections can also be supplied. Bore It is the inside cylindrical diameter of a thermowell. Available in Ø7 mm, 9 mm, 11 mm and 13 mm. L - Instrument insertion length It is the length from the top oft the mounting threads of a thermometer to the end of its stem or from the threads of a union bushing on a fixed extension or a capillary, to the end of the extension. E - Shank configuration It is the shape of that portion of a thermowell that is inserted into the process. The tapered shank is recommended as opposed to a stepped or straight shank due to the superior strength and vibration resistance. T - Lagging extension Show as T, it is used when the vessel or pipe into which the thermowell is inserted, is insulated. This is the extra length between the process connection and the instrument connection of a thermowell, which is determined by the insulation thickness. The standard lagging extension is 75 mm except it is 50 mm for the thermowells with 60 mm (U) dimensions. Others are available on request P - Process connection It is that portion of the thermowell which provides the mechanical connection with the vessel or pipe. These connections can be integral male thread, prepared surface for welding flanges for mechanical pressure seals, or combinations thereof. Thermowell standard process threads are ½”, ¾” and 1” NPT. U - Thermowell insertion length It is that portion of the shank from the process connection to the tip of the shank which is inserted into the process area. Specifications are subject to change without notice Web: www.pci-instruments.com | Email: [email protected] | Tel: +44

Thermowells Solid Machined Threaded TWS “Quality Matters” Model TWS - tapered shank Other sizes on request Model TWS - straight shank Other sizes on request Specifications are subject to change without notice Web: www.pci-instruments.com | Email: [email protected] | Tel: +44 (0)1704 509090

“Quality Matters” Thermowells Solid Machined Threaded TWS Standard Dimensions (in mm) Other sizes on request Connections Instrument connection: BSPP / BSPT / NPT / Metric Process connection: BSPP / BSPT / NPT / Metric Materials • Standard materials: AISI 316 / 316-Ti / 304 / 321 • Special materials such as: Duplex / Monel 400 / Titanium / Nickel / Hastelloy C276 / Inconel 600 / PTFE Options • SS Tag wired to thermowell • Plug and chain Optional documentation • Construction drawing • Hydrostatic pressure test • Dye penetrating test • 3.1 material certificate • Certificate according to NACE • Heat...