When choosing a liquid-tight RTD sensor, reliability and compatibility with harsh environments are essential. This guide highlights five well-suited options that combine PT100 accuracy with rugged construction, suitable for liquid exposure, beer brewing, chemical processing, and industrial control. Each product listing includes mounting options, temperature range, and key features to help you compare quickly and make a sound buying decision.
| Product | Brand | Key Features |
|---|---|---|
| Auber Instruments Liquid Tight RTD Sensor, 34 mm Probe | Auber Instruments | Class A PT100 RTD; max 200°C; 1/8 NPT thread |
| AUBER Liquid Tight RTD Sensor, 34 mm Probe | AUBER | Class A PT100 RTD; max 200°C; 1/8 NPT thread |
| ROCON P Tri-Clamp Waterproof RTD PT100 | ROCON P | Tri-clamp compatible; RTD PT100; liquid-tight seal |
| BlueStars Waterproof RTD PT100 Temperature Sensor | BlueStars | 3-wire RTD; 4x30mm stainless probe; -50°C to 200°C |
| Gikfun Waterproof PT100 RTD Temperature Sensor Probe | Gikfun | 3-wire waterproof PT100; 0.5 m cable; -40°C to 125°C |
Note: The five options above were selected for broad compatibility with liquid environments, robust construction, and standard RTD/PT100 sensing elements. Availability and specifications may vary by seller; confirm current details before purchasing.
Auber Instruments Liquid Tight RTD Sensor
The Auber Instruments Liquid Tight RTD Sensor features a Class A PT100 RTD element designed for precise temperature measurement in demanding environments. With a maximum operating temperature of 200°C (392°F) and a 1/8 NPT mounting thread, it provides a reliable, liquid-tight installation suitable for pipework, tanks, and process lines. The 34 mm probe length offers substantive immersion and protection in inline applications. This sensor is commonly used in food processing, brewing, and chemical handling where a robust, tightly sealed RTD is needed.
AUBER Liquid Tight RTD Sensor
The AUBER version mirrors the Auber Instruments model with a Class A PT100 RTD, 200°C maximum temperature, and a 1/8 NPT thread. This sensor emphasizes compatibility with tight-seal installations in pipeline systems and process equipment. The 34 mm probe length balances sensing response with physical protection, making it suitable for beer production, chemical processing, or industrial control loops where a liquid-tight RTD is essential.
ROCON P Tri-Clamp Waterproof RTD PT100
The ROCON P model is designed for tri-clamp installations, enabling a liquid-tight seal on standard sanitary piping. It uses a PT100 RTD element and supports sectors requiring hygienic or clean-in-place (CIP) processes, such as biotech, brewing, and dairy. Its tri-clamp compatibility expands the range of installation options, with a focus on leak resistance and straightforward maintenance in high-purity environments.
BlueStars Waterproof RTD PT100 Sensor
The BlueStars probe is a 3-wire RTD PT100 temperature sensor with a stainless steel 4x30mm probe. Its waterproof and oil-proof cable construction provides robust protection against liquid exposure, making it suitable for PID temperature controllers, process control, and environments where moisture and contaminants are concerns. The 2-meter cable length supports flexible mounting and convenient routing in compact equipment spaces.
Gikfun Waterproof PT100 RTD Temperature Sensor Probe
The Gikfun kit includes two 3-wire, waterproof PT100 RTD probes with a 0.5-meter cable length. This setup is ideal for compact installations or pilot-scale systems where multiple sensing points are needed within a liquid environment. The waterproof design supports reliable operation across beer brewing, water treatment, and laboratory instrumentation, with accurate PT100 readings across a broad range.
Buying Guide: Key Purchase Considerations for Liquid Tight RTD Sensors
- Sensor type and accuracy: PT100 RTD sensors offer good repeatability and wide temperature range. Look for Class A or Class B accuracy ratings according to relevant standards for industrial control and measurement.
- Temperature range: Ensure the sensor’s maximum and minimum temperatures align with your process. Common liquid-tight RTDs handle -50°C up to 200°C, with some models supporting higher or lower limits.
- Sealing and mounting: Liquid-tight designs include threaded (such as 1/8 NPT) and tri-clamp options. Confirm the mounting interface matches your vessel or pipe system and supports your IP or splash protection needs.
- Cable and insulation: Consider cable length, shielded vs. unshielded, and insulation quality. Longer runs may require shielded, oil- or chemical-resistant cables to prevent signal loss or damage in harsh environments.
- Chemical and cleaning compatibility: In brewing or food-grade settings, choose sensors with sanitary connections and materials compatible with CIP/SIP processes and cleaning chemicals to avoid corrosion.
- Maintenance and replaceability: Prefer sensors with standard thread sizes and plug-and-play connectors to simplify maintenance and replacements without re-calibrating the entire system.
- Environmental factors: If the installation is in damp or wet environments, verify IP ratings and the presence of any protective housings or seals to minimize ingress.
- System compatibility: Confirm the RTD’s output (Ohms, typically 100 Ω at 0°C for PT100) is compatible with your controllers, PID loops, or data loggers, including required wiring configurations (3-wire or 4-wire).
- Sanitary vs. industrial use: Tri-clamp designs suit sanitary process lines, while NPT-threaded assemblies may be better for rugged, general-purpose installations. Choose based on cleaning cycles and maintenance access.
Liquid-tight RTD sensors offer stable temperature sensing in environments where moisture, liquids, or chemical exposure could compromise standard probes. When selecting, balance physical fit, sealing method, temperature requirements, and compatibility with your control system to ensure accurate and reliable process monitoring.