Temperature sensors consist of not only the sensor but means to protect it. More time is spent choosing the best method of protection than choosing the type of sensor. The way a sensor is protected is called the protection sheath and its selection can be independent of the type of sensor.
Protection Sheath Functions
- Prevent dust or anything else from contaminating the temperature sensor
- Protect the sensor from pressure, abrasion or chemical conditions of the process
- Provide a means for the sensor to attach to a process
- Ensure that the sensor reading is dominated by the process temperature
- Provide a means to easily change sensors
- Protect the temperature sensor in transport, storage and use
Temperature sensors can be divided into two groups with different protection needs:
Moderate and Light Use Temperature Sensors - Details
Key Design Consideration -
Connection and Mounting Arrangement
- Mainly used with equipment
- Can be high and medium volumes
- Lower Temperatures
- Integral housing and sensor assembly
- Inexpensive
- Both single use or long life
- High design effort to reduce unit cost for specific application
Harsh Use Sensors (High Temperature or Chemical Use) - Details
Key Design Consideration -
Sheath Material Choice
- Mainly used in plants/factories
- Smaller volumes
- High temperatures
- Harsh environment – chemical attack, pressure, abrasion, carburisation
- Easily dismantled for repair or precious metal recovery
- Higher cost
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