How To Select a Suitable Thermowell EMCO Thermowells How to Select a Suitable Thermowell In many pressurised processes it is often not possible or advisable to insert the temperature instrument directly into the media being measured. A thermowell protects the temperature instrument, permits the instrument to be exchanged or calibrated, and keeps dangerous or expensive media within the process installation. To make a proper selection of a thermowell one must also take into account the thermal lag (response time), the sensing accuracy as well as the service condition, i.e. pressure, temperature, velocity, corrosiveness etc. In the following different subjects are highlighted for correct thermowell selection. Instrument Connection The the...