A thermocouple is a temperature measurement tool that connects to a data interpretation device to form a high precision probe. He owes his success to his high reaction speed Compared to other sensor models. However, all thermocouple temperature probes do not offer an identical response time. THE thermocouples are classified according to types (K, J, T, E, R, S, B) according to the materials used to design them. Does the Thermocouples response time varies according to the types? Should we also seek on the side of the other characteristics of thermocouples? Here are the keys to understanding what determines the response time for a thermocouple.
What are the different characteristics of thermocouples?
The ranges of thermocouples are wide because their design includes many parameters. These characteristics influence the temperature measurement precision as well as on response time thermocouple.
The materials of the conductive wires
The two sons that constitute the Heart of thermocouple contain different metals or alloys. It is the nature of these sons that defines the type of thermocouple. The types K, J, T and E are the most common, while the types R, S and B contain precious metals, increasing their price. The major difference between these categories is the temperature range Covered.
The protection of thermocouple
THE Thermocouple with naked threads is the most economical, but sensitive to oxidizing environments. Thermocouples with a mineral insulation in a metal sheath are more robust and electrically insulated. Materials commonly used for mineral insulation include alumina and magnesium, heat resistant.
The junction method
A probe thermocouple Can have different junctions: welded, isolated or exposed. An exposed junction improves reactivity, while isolated junction protects from electric interference.
The connection cable
To extend the distance between the Thermocouple probe and the measurement device, we use a compensation cable or a Thermocouple cable. The compensation cable is more economical for thermocouples with precious metals.
What characteristics influence the response time of a thermocouple?
THE Thermocouple type influences precision but not on the speed of reaction. The response time is improved when contact with the environment is direct. THE Thermocouples with naked wires and at welded junction offer a quick response.
There sheath size also plays a role. A fine sheath (0.25 mm, 0.5 mm, 1 mm) reacts faster to temperature variations. However, its resistance to extreme conditions can be reduced.
In the event of the sheath alteration, theThermocouple calibration Can be affected, requiring recalibration before use.
Go further on thermocouples
- Category of thermocouples probes
- What are the different types of thermocouples
- Calibration of a thermocouple
- How do we measure the temperature by thermocouple?
- Thermocouples response time by type
- How to test a thermocouple?
- Thermocouples measurement range
