Waterproof RTD PT100 Temperature Sensor: Complete Guide to Immersible Probes for Water, Liquid & Wet-Environment Monitoring (2026)

Quick Answer

A Waterproof RTD PT100 Temperature Sensor is a fully sealed stainless-steel temperature probe specifically designed for direct immersion in water, liquids, and high-humidity environments. Unlike conventional RTD sensors that are intended for dry process applications, waterproof PT100 sensors can operate continuously in tanks, reservoirs, pipelines, cooling systems, food processing equipment, and outdoor installations without suffering moisture ingress or signal degradation.

AAVAD Instrument’s APES-5×75 Waterproof PT100 Sensor features a Class A Platinum PT100 element, SS316 immersible probe, and 3-meter TF/TF/SS shielded cable, making it ideal for industrial, commercial, and environmental temperature monitoring applications.

Why Waterproof Temperature Sensors Matter

Temperature measurement becomes significantly more challenging when sensors are exposed to:

• Continuous water immersion
• High humidity
• Outdoor weather conditions
• Washdown environments
• Chemical cleaning cycles
• Condensation

Many standard temperature sensors perform well in dry industrial environments but fail prematurely when exposed to moisture over extended periods.

This is why industries increasingly specify Waterproof RTD PT100 Temperature Sensors for critical monitoring applications.

What Is a Waterproof RTD PT100 Temperature Sensor?

A PT100 RTD (Resistance Temperature Detector) is a temperature sensor that uses a platinum sensing element whose electrical resistance changes predictably with temperature.

The term PT100 refers to:

• Platinum sensing element
• 100 Ohms resistance at 0°C

Because platinum provides excellent stability and repeatability, PT100 RTDs are among the most widely used industrial temperature sensors worldwide.

A waterproof PT100 sensor incorporates additional design features that allow it to function reliably in wet environments for years without corrosion or signal loss.

Aavad Waterproof RTD PT100 Sensor Specifications

Model: APES-5×75

What Makes an RTD Sensor Waterproof?

Many buyers assume that an IP-rated sensor is automatically waterproof.

In reality, there is a major difference between:

Water-Resistant Sensors

Designed to withstand occasional splashes.

Waterproof Immersible Sensors

Designed for continuous direct contact with liquids.

The AAVAD Waterproof RTD Sensor achieves this through three key design elements.

1. SS316 Stainless Steel Probe

The sensing element is protected by a fully sealed SS316 stainless steel sheath.

Benefits include:

✔ Corrosion resistance

✔ Long service life

✔ Water compatibility

✔ Chemical resistance

✔ Food-grade suitability

This makes the sensor ideal for tanks, pipelines, reservoirs, and process liquids.

2. Compacted MgO Insulation

The sensor uses high-density mineral insulated magnesium oxide (MgO).

This provides:

✔ Excellent thermal conductivity

✔ Moisture protection

✔ Electrical insulation

✔ Mechanical durability

The compacted insulation prevents water from reaching the platinum sensing element.

3. TF/TF/SS Shielded Cable

The integrated cable uses:

• Teflon insulation
• Stainless steel braiding

Benefits include:

✔ Waterproof performance

✔ Chemical resistance

✔ Signal stability

✔ Mechanical protection

✔ Long-term reliability

Why Class A Accuracy Is Important

One of the most significant advantages of this waterproof PT100 sensor is its Class A Accuracy.

Class A Tolerance

±(0.15 + 0.002 × |t|)°C

Standard Class B Tolerance

±(0.30 + 0.005 × |t|)°C

Class A sensors provide approximately twice the accuracy of Class B sensors.

Applications That Benefit from Class A Accuracy

Cold Storage Facilities

Precise temperature control reduces spoilage risk.

Food & Beverage Processing

Supports quality assurance and compliance.

Pharmaceutical Storage

Maintains validated temperature records.

Aquaculture Systems

Ensures optimal water temperature conditions.

Key Features of Aavad Waterproof RTD Sensors

PT100 Platinum Sensing Element

High accuracy and excellent repeatability.

Waterproof Immersible Design

Suitable for permanent liquid immersion.

SS316 Stainless Steel Construction

Corrosion-resistant and durable.

Wide Temperature Range

-50°C to 400°C

Stable Signal Performance

Reliable readings over extended cable lengths.

Long Service Life

Minimal maintenance requirements.

Easy System Integration

Compatible with:

• PLC Systems
• SCADA Platforms
• Data Loggers
• Temperature Controllers
• Industrial Automation Systems

Applications of Waterproof PT100 Temperature Sensors

Water Tanks and Reservoirs

Continuous monitoring of stored water temperature.

Pipelines and Process Water Systems

Ideal for industrial water management systems.

Cold Storage and Refrigeration

Accurate monitoring of temperature-sensitive products.

Food & Beverage Industry

Suitable for washdown environments and hygienic processing areas.

Aquaculture

Water temperature monitoring for fish farming and hatcheries.

Water Treatment Plants

Reliable performance in treatment tanks and process systems.

HVAC Systems

Used in chilled water and environmental monitoring applications.

Outdoor Installations

Suitable for exposed weather conditions and high humidity environments.

Waterproof PT100 Sensor vs Standard PT100 Sensor

How to Select the Right Waterproof Temperature Sensor

Before purchasing, consider:

Liquid Type

• Water
• Process Liquid
• Food Product
• Chemical Solution

Temperature Range

Verify minimum and maximum process temperatures.

Mounting Method

• Threaded Connection
• Direct Immersion
• Tank Installation

Accuracy Requirement

Class A recommended for critical monitoring.

Cable Length

Choose standard or custom cable length based on installation requirements.

Frequently Asked Questions

Can this PT100 sensor be permanently submerged in water?

Yes. The SS316 probe, compacted MgO insulation, and TF/TF/SS cable are specifically designed for continuous immersion.

What is the difference between Class A and Class B RTD sensors?

Class A sensors provide approximately double the measurement accuracy of Class B sensors.

Can I order longer cable lengths?

Yes. Custom cable lengths are available upon request.

Is this sensor suitable for food processing applications?

Yes. The SS316 stainless steel construction and waterproof design make it suitable for food and beverage environments.

What temperature range can this sensor measure?

-50°C to 400°C.

How is the sensor installed?

The sensor features a 1/4″ Male NPT process connection for direct installation into tanks, vessels, and pipelines.

Why Choose Aavad Instrument for Waterproof RTD Sensors?

Aavad Instrument Pvt. Ltd. is a leading RTD Sensor Manufacturer in India, serving industrial customers across power generation, pharmaceuticals, food processing, water treatment, HVAC, and automation industries.

Our Advantages

✔ ISO 9001:2015 Certified Manufacturing

✔ NABL-Accredited Calibration Support

✔ Custom Sensor Fabrication

✔ Fast Technical Assistance

✔ PAN India Supply Network

✔ Trusted by Leading Industrial Organizations

Industries Served

• Water Treatment
• Food Processing
• Pharmaceutical Manufacturing
• HVAC
• Cold Storage
• Chemical Processing
• Industrial Automation

Conclusion

When temperature measurement must be accurate, reliable, and capable of surviving continuous exposure to water or moisture, a standard RTD sensor is often not enough.

A waterproof PT100 RTD sensor provides the durability, accuracy, and long-term stability required for modern industrial applications.

With Class A accuracy, SS316 construction, and a fully sealed immersible design, Aavad’s Waterproof RTD PT100 Temperature Sensor delivers dependable performance in even the most demanding wet environments.

Request a Quote

Looking for a Waterproof RTD PT100 Temperature Sensor Manufacturer in India?

Contact Aavad Instrument Pvt. Ltd. for technical support, custom configurations, and application-specific recommendations.

📞 +91 90996 22823

🌐 www.aavadinstrument.com

📧 hrg@aavadinstrument.com

Request a Quote for the Waterproof RTD PT100 Temperature Sensor →

Aavad Instrument Pvt. Ltd.

Precision Temperature Measurement for Water, Liquid & Wet Environment Applications