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Home
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Hydrogen Detectors

Fixed Hydrogen Sensor

21 Senses Inc.

  • Extremely compact design (98 × 64 × 34 mm, < 350 g)
  • Detects hydrogen selectively, even in the presence of multiple background gases
  • Wide operating range (ppm to 25 % H₂ v/v)
  • Damage resistant to over-exposure and humidity.
  • Multiple outputs: 4–20 mA, analogue voltage, RS485.
  • Easy calibration via computer interface with certified gas kit.
  • Patented solid-state electrochemical hydrogen sensor with solid electrolyte and novel reference electrode.

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Description Vendor

The Fixed Hydrogen Sensor is a patented solid-state electrochemical hydrogen sensor designed for high sensitivity, selectivity, and accuracy. It features an extremely compact design measuring 98mm x 64mm x 34mm and weighs less than 350gms. The sensor detects hydrogen selectively even in the presence of multiple background gases and has a sub-second response time, with T20 to T90 ranging from 0.5 seconds to 2.5 seconds. It offers a wide operating range from ppm levels up to 10% H2 v/v and is damage-resistant, withstanding over-exposure to hydrogen and high humidity. The sensor has an operating life of 4-5 years and supports various output options including analogue voltage, 4-20mA, CAN (29-bit), and RS485. It is energy-efficient, operating at less than 30mA on 24VDC. The sensor is housed in an IP68 powder-coated aluminum enclosure and seamlessly integrates with SCADA, PLC, DCS, BMS systems, as well as on-board ECU and HSCU systems in automotive applications. It enhances safety by detecting and addressing very low levels of leaks early, ensuring reliable operation during catastrophic hydrogen releases and providing continuous alerts. The sensor is compact, easy to handle, and deployable in space-constrained locations, significantly accelerating system response time by 4X when positioned near the ceiling. It offers cost-saving operations by eliminating unnecessary downtime and false alarms, and includes comprehensive AMC (After-Market Care) for periodic calibration and hassle-free product replacement. The sensor also supports future-ready upgrades and tailored solutions for large-volume collaborations, including customization for specific operating conditions, wireless communication, alternative power management, and meeting size and material construction requirements.

Use Cases

  • Electrolysers (PEM, Alkaline, SOEC and other burgeoning technologies)
  • Fuel Cells (PEM and SOFC)
  • Hydrogen Supply Chain (Transport Pipelines, Containers, Storage Sites, Tankers, and Fuelling Pumps)
  • Strategic Sectors (Space Exploration, Nuclear Research, Defence, and R&D)
  • New Age Applications (Ships, Aircrafts, Backup Generators, Biomass to H2, H2-PNG Blending, Other Green Hydrogen Production Techniques)

Capabilities

  • Response initiates in 0.5 s, T90 ≤ 10 s.
  • Operates reliably at 1 – 1.2 bar, −20 °C to 65 °C, ≤ 99 % r.H.
  • Interfaces with SCADA, PLC, DCS, BMS via analogue or digital outputs.
  • Consumes ≤ 50 mA at 24 V DC (low power).
21 Senses Inc.

21Senses develops solid-state and MEMS-based hydrogen and multi-gas sensing technology used for safety monitoring and process optimization across the hydrogen value chain. Its sensors detect hydrogen concentrations as low as 1 ppm with fast response times, serving applications such as electrolyzer leak detection, fuel cell safety monitoring, hydrogen refueling, and hydrogen-cooled power generators. The company offers both fixed and portable hydrogen leak detectors as well as online multi-gas analyzers, designed to withstand high moisture and high-hydrogen-exposure environments. 21Senses also builds an IoT-enabled data platform that unifies sensor outputs to support predictive, real-time decision-making for hydrogen supply chain and mobility customers.

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