Waterproof technology of temperature sensor probe

In modern sensing technology applications, (NTC, PTC, PT100, thermocouple, thermal resistor, DS18B20, etc. cable, probe kit) temperature sensors are key measuring tools. They are widely used in industrial automation, agricultural monitoring, automobile manufacturing and other fields. In order to ensure that the temperature sensor can work stably and reliably in a humid or wet environment, waterproof and moisture-proof technology has become an important design point. The following are several technical points for waterproof and moisture-proof of temperature sensors:

Waterproof NTC thermistor sensor probe

Waterproof thermocouple PTC100 PT1000 sensor probe

Waterproof DS18B20 temperature sensor probe

1. Package design
Packaging materials: Waterproof and moisture-proof temperature sensors usually use high-performance packaging materials. These materials have excellent waterproof and moisture-proof properties. Common packaging materials include corrosion-resistant metals (such as stainless steel) and engineering plastics (such as polytetrafluoroethylene). They can effectively isolate moisture and liquids and protect internal electronic components from damage.

Sealing technology: In order to enhance the waterproof and moisture-proof performance, sealing technology such as O-rings, silicone sealing rings or epoxy resin potting is used in the package. These sealing measures can prevent water and moisture from entering the sensor through seams or openings, thereby improving its environmental adaptability.

2. Protection level
IP level: The waterproof and moisture-proof performance of the temperature sensor is often expressed by the IP (Ingress Protection) level. The IP level consists of two numbers, the first number indicates the protection level against solid substances, and the second number indicates the protection level against liquids. For example, IP67 means that the sensor is completely dustproof and can work normally within 30 minutes of immersion in 1 meter of water.
Corrosion-resistant coating: In some particularly harsh environments, such as chemical plants, sensors may be exposed to corrosive substances. For this reason, a corrosion-resistant coating may be applied to the surface of the sensor to further enhance its protection.

3. Material selection
Corrosion-resistant materials: In order to cope with possible corrosion problems in humid environments, sensors are usually made of corrosion-resistant materials. For example, stainless steel (such as 304 or 316L stainless steel) has excellent corrosion resistance and is suitable for use in wet and acid-base environments.

Insulating materials: The insulating materials of internal electronic components must also have excellent moisture resistance. High-quality insulating materials can prevent moisture from penetrating into the circuit of the sensor, thereby avoiding short circuits or damage.

4. Structural design
Vent hole design: In order to prevent the package from breaking due to changes in internal air pressure caused by temperature changes, waterproof and moisture-proof temperature sensors are often designed with vent holes. These vent holes use microporous membranes or breathable materials to allow internal gas to be discharged freely while not allowing moisture and dust to enter.

Fastening structure: The connection part and fixed structure design of the sensor also need to consider waterproof and moisture-proof factors. Through reasonable fastening and fixing methods, moisture is prevented from entering the sensor through the connection points.

Waterproof RTD temperature sensor probe

Stainless steel waterproof probe for temperature sensor

Injection molded waterproof probe for temperature sensor

5. Testing and certification

Environmental testing: In order to ensure the waterproof and moisture-proof performance of the sensor, strict environmental testing is usually required. These tests include immersion tests, high humidity environment tests, and temperature change tests to ensure that the sensor can work stably under various harsh environmental conditions.

Certification standards: The waterproof and moisture-proof performance of the sensor is often certified according to international standards, such as ISO 20653 or IEC 60529. These certification standards provide detailed requirements for protection levels and test methods to help ensure that the product meets the requirements of protection performance.

Summary
The waterproof and moisture-proof technology of the temperature sensor is the key to ensuring its stable operation in complex environments. By optimizing the packaging design, selecting the right materials, improving the structural design and conducting rigorous testing and certification, the environmental adaptability of the sensor can be effectively improved. These technical points not only improve the durability of the sensor, but also ensure its reliability and accuracy in various wet or humid environments.