Grounded Junction Thermocouples At the tip of a grounded junction probe, the thermocouple wires are physically attached to the inside of the probe wall. Check also our video about thermocouple junctions: How do I know which junction type to choose? Sheathed thermocouple probes are available with one of three junction types: grounded, ungrounded or exposed. Installation requirements (may need to be compatible with existing equipment existing holes may determine probe diameter).Chemical resistance of the thermocouple or sheath material.Determine the application where the thermocouple will be used.The following points need to be answered before choosing a thermocouple: How to select a thermocouple type Because a thermocouple measures in wide temperature ranges and can be relatively rugged, thermocouples are very often used in industry. For example, existing holes may determine the probe diameter The thermocouple may need to be compatible with existing equipment. If faster response times takes priority in a corrosive environment, then a grounded thermocouple is best Both a grounded or ungrounded thermocouple can be used in corrosive or high-pressure environments, but an ungrounded probe is best if there is a need to have the thermocouple electronically isolated from and shielded by the sheath. Consider any chemical, abrasion or vibration resistanceĪn exposed thermocouple is limited in use to noncorrosive applications.An ungrounded thermocouple offers the slowest response time but can still be the best choice if it is also desirable to have the thermocouple electronically isolated from and shielded by the sheath. However, if the probe will be exposed to corrosive gas or high pressure, an exposed junction should not be used. An exposed junction will provide the fastest response times. There are three types of thermocouple junctions: exposed, grounded or ungrounded. Determine how important a fast response time is.However, if your thermocouple probe will be exposed to extreme temperatures, a type N thermocouple is more stable in high temperatures and a type T thermocouple is best for extremely low temperatures Once you know the thermocouple temperature range that you need, you can refer to our thermocouple range chart to help you determine which thermocouple is best for the temperature ranges you need.Ī type K thermocouple offers a wide temperature range and is one of the most often used thermocouples. Determine the temperature ranges the probe will be exposed to.If you need to measure gas or air temperature then an armored thermocouple or a vacuum thermocouple. ![]() ![]() Thermocouples can be used across industries and applications, so selecting the right one for your purposes starts with knowing exactly how and where you want to use it
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