Hydrogen-powered engines are emerging as a clean and efficient alternative for heavy-duty and commercial vehicles. However, hydrogen environments demand high-accuracy, explosion-proof, and durable temperature monitoring solutions. To meet these requirements, Hi-Tech Transducers & Devices Pvt. Ltd. has developed the ATEX-Certified HT-1500 Series—a robust line of temperature sensors designed specifically for Hydrogen Engine Vehicle Testing & Development.
In this guide, we provide a complete technical overview of our PT100 (RTD) and K-Type Thermocouple variants, engineered to operate safely and reliably in hazardous Zone 1 and Zone 2 hydrogen atmospheres.
Why Temperature Sensing Is Critical in Hydrogen Engine Testing
Hydrogen combustion engines operate at high temperatures, high pressures, and under strict safety protocols. Accurate temperature measurement is essential for:
- Monitoring cylinder head & exhaust temperatures
- Evaluating hydrogen combustion efficiency
- Protecting prototype engines from overheating
- Validating ECU-controlled fuel strategies
- Ensuring safety in explosive hydrogen atmospheres
- Supporting certification & homologation requirements
Typical test environments include:
- Hydrogen engine dyno test cells
- Fuel line & injector temperature monitoring
- Turbocharger and exhaust manifold temperature points
- Catalyst & after-treatment development
This makes ATEX-compliant sensors mandatory.
ATEX Certification – Ensuring Safety in Hydrogen Atmospheres
Hydrogen gas (Group IIC) is highly flammable and requires equipment certified for explosion protection.
Our HT-1500 sensors comply with:
- IEC 60079-0:2017 / EN 60079-0:2018 (General Requirements)
- IEC/EN 60079-1:2014 (Flameproof Protection “Ex d”)
This ensures:
- Safe operation in explosive hydrogen atmospheres
- Flameproof construction
- Controlled surface temperature
- Durability under vibration, thermal cycling, and mechanical stress
The sensors are fully suitable for OEM test cells, vehicle development labs, and field prototype testing.
HT-1500 PT100 (RTD) – Technical Specifications
| Parameter | Specification |
| Model | HT-1500 |
| Type | PT100, RTD Transition Type |
| No. of Elements | 1 |
| Resistance | R100 |
| Grade | Class A |
| Temperature Range | 0 to 200°C |
| Sheath Diameter | 6 mm |
| Sheath Length | 150 mm to 500 mm |
| Termination Options | 8-Pin Connector T3524528 / Omega Connector / Pin Type Lugs |
| Extension Cable | FEP Extruded RTD Cable, 1–10 m |
| Compression Fitting | SS 304, ¼” NPT, Swage Lockable |
| Compliance | IEC 60079-0 & IEC 60079-1 |
Applications in Hydrogen Engine Testing
- Coolant temperature measurement
- Intake & charge-air temperature monitoring
- Fuel rail & hydrogen injector temperature
- Catalyst / SCR inlet temperature
With high accuracy (Class A), the PT100 variant is ideal for low-to-medium temperature measurement with excellent repeatability.
HT-1500 K-Type Thermocouple – Technical Specifications
| Parameter | Specification |
| Model | HT-1500 |
| Type | Chromel/Alumel (K-Type), Transition Type |
| No of Elements | 1 |
| Temperature Range | 0 to 1000°C |
| Sheath Diameter | 6 mm |
| Sheath Length | 150 mm to 500 mm |
| Termination Options | 8-Pin Connector T3524528 / Omega Connector 2-Pin / Pin Type Lugs |
| Extension Cable | Teflon Extruded K-Type Cable, 1–10 m |
| Compression Fitting | SS 304, ¼” NPT, Swage Lockable |
| Compliance | IEC 60079-0 & IEC 60079-1 |
Applications in Hydrogen Engine Development
- Exhaust manifold & turbocharger temperature
- Combustion chamber wall temperature
- Catalyst monitoring
- High-temperature test cell parameter logging
The thermocouple version offers ruggedness and a wide temperature range suited for extreme environments.
Key Engineering Features of the HT-1500 Series
✔ Flameproof ATEX Design
Built to operate safely in hydrogen atmospheres (Zone 1/Zone 2).
✔ High Mechanical Strength
6 mm stainless steel sheath allows installation in vibration-prone engine test cells.
✔ Swage-Lockable Fittings
Ensures leak-proof installation for hydrogen lines and test rigs.
✔ Multiple Connector Options
Supports leading OEM test setups and DAQ systems.
✔ Customizable Lengths & Cable Types
Available from 150 mm to 500 mm with 1 m to 10 m cable options.
✔ Designed for Automotive R&D
Optimized for hydrogen engine and heavy-vehicle drivetrain development.
Why Hydrogen Testing Requires Special Sensors
Hydrogen presents unique engineering challenges:
- High diffusion rate causes leakage through poor fittings
- Hydrogen embrittlement requires specific materials
- High ignition sensitivity demands ATEX-certified devices
- Fast combustion causes sharp thermal gradients
- Test cells require vibration-resistant sensors
The HT-1500 series is engineered to overcome all these challenges with certified safety and reliability.
Conclusion
The HT-1500 ATEX-Certified Temperature Sensors from Hi-Tech Transducers & Devices Pvt. Ltd. are purpose-built for modern Hydrogen Engine Vehicle Testing & Development. With high accuracy, rugged stainless-steel construction, and compliance with global explosion-proof standards, these sensors deliver reliable performance in the demanding environments of H₂ engine research, test cells, and prototype validation.
Whether you require precision PT100 RTD sensors or high-temperature K-Type thermocouples, the HT-1500 series provides a complete, customizable solution for your hydrogen testing needs.