What Is An Exposed Junction?
TL;DR — Quick Summary
An exposed junction thermocouple has its measuring point outside the protective sheath for ultra-fast temperature response. It’s ideal when speed is key and damage risk is minimal but is vulnerable to wear and tear.
What Is an Exposed Junction?
An exposed junction is a specific type of thermocouple measuring junction. In this design, the two thermocouple conductors are joined directly to form the measuring junction, which remains exposed outside the thermocouple sheath.
This exposed configuration allows for a very rapid temperature response time, making it ideal where speed of measurement is critical.
Advantages and Limitations
- Fast Response: Because the junction is not insulated or enclosed, it can quickly detect changes in temperature.
- Vulnerability: The exposed junction is unprotected and therefore more susceptible to physical damage, corrosion, or contamination.
- Best Use: Suitable for environments where quick response is essential and the risk or consequences of damage to the sensor are low.
Related Types of Thermocouple Junctions
- Grounded Junction: The measuring junction is physically connected to the sheath, providing protection and moderate response times.
- Insulated/Ungrounded Junction: The junction is insulated from the sheath, offering electrical isolation but typically slower response compared to exposed junctions.
Frequently Asked Questions (FAQ)
Q1: Why choose an exposed junction over other types?
For the fastest possible temperature measurement when the sensor is not at high risk of damage.
Q2: Where are exposed junctions commonly used?
In lab settings, rapid temperature testing, or controlled environments where quick response outweighs durability concerns.
Q3: What are the risks of using an exposed junction?
They can be physically damaged or contaminated easily, which may affect accuracy and sensor lifespan.
Q4: How does an exposed junction compare to a grounded junction?
Exposed junctions respond faster but are less protected; grounded junctions are more durable but slightly slower.
If you want to order a temperature sensor or you are unsure exactly what you need, get in touch and we can help you.