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VOC & H2 Off-Gas Sensor
UL61010 - Calibration Free - 10y+ lifespan

VOC-H2-TEMP sensor
RS485 VOC-H2-TEMP sensor

standard sensor version connecting to base unit with Modbus TCP, SNMP or MQTT output

native Modbus RTU (RS-485) version with 24v DC input and 2 relay outputs with 256 addresses


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The industry's first calibration free hydrogen sensor

patents pending
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key sensor features
The GAS-VOC-H2 gas sensor is a calibration free, plug and play sensor to detect VOC, hydrogen and temperature events.
Available in select markets through OEM as IP based sensors (standard or daisy chained) or native RS-485 (24v DC in).

The sensor features a very fast response time of less than 30s for T90. The RS-485 version has a wide operating temperature range as low of -30C and up to 60C and includes 2 relay outputs.

Stage 2 lithium ion gas venting - based on revolutionary spectrometer analysis
- T90 for hydrogen in less than 30seconds
- measures VOC levels between a 0-500 VOC index
- measures H2 levels between 0-100% LEL
- measures temperatures -30°C to +60°C
- measures humidity 0-95%rh
- a resolution of 0.1°C and 0.1% rH
- with a ±0.8°C accuracy from 15°C-35°
- with a ±5% LEL accuracy from 0-100%
- with a ±6%rH accuracy from 15°C-35°

- available as a standard sensor
- or daisy chained (up to 16 sensors per daisy chain)
- or native RS-485 sensor with 2 relay outputs

- ISO 17025 temperature sensor calibration
- UL 61010
- NFPA 72 for H2 detection

- 10+ year life span in normal conditions

- compact plug & play sensor.
- designed for indoor use.
- steel enclosure for non-power sensors or non-IP sensors. custom color & logo options available.
- industrial grade.
- 0u rack, DIN rail, magnetic or wall mountable sensor.
- plugs into the base unit.
- powered by the base unit.
- alerts via SNMP Traps, email or SMS.
- out of the box integration via Modbus TCP, SNMP.
- optional integration via MQTT for Industrial IoT applications1New feature.
- optional integration via RS-485 enabling direct integration with your own gateway & controllers.2New feature

1Requires FW 10 or higher
2Some sensors are not available in RS-485 native versions. In that case RS-485 is available using the optional Modbus RTU module.
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Enhancing Safety in Battery Energy Storage Systems
Understanding the Risks
Sensors to monitor batteries Lithium-ion (Li-ion) batteries are pivotal in modern energy storage systems, offering high energy density and efficiency. However, they are not without risks. One significant concern is the phenomenon of off-gassing, a process where batteries emit potentially hazardous gases under certain conditions.

The Off-Gas Phenomenon in Li-ion Batteries

Off-gassing in Li-ion batteries can occur due to various reasons, posing safety hazards, including the risk of thermal runaway – a chain reaction leading to fires or explosions. Understanding and monitoring these gas emissions is crucial for safe operation.

Why Monitor VOCs?

Volatile Organic Compounds (VOCs) are key indicators of potential problems in Li-ion batteries. They are emitted during critical situations like electrolyte leaks and overcharging. Detecting VOCs early can help prevent thermal runaway by allowing timely intervention, such as shutting down the affected battery units.

The Role of Hydrogen Gas

Hydrogen is another critical gas in the context of Li-ion batteries, particularly in systems with liquid cooling. It is typically produced during electrolysis, a chemical reaction that can occur in these batteries. Monitoring hydrogen levels is essential for preventing hazardous conditions.

The GAS-VOC-H2 Sensor: A Comprehensive Solution

Our GAS-VOC-H2 sensor stands out as the only market-available device capable of discretely reporting both VOC and Hydrogen metrics (0-100% LEL). This sensor is an indispensable tool for ensuring the safety and efficiency of Li-ion battery storage systems.

Key Features of the GAS-VOC-H2 Sensor:
 Dual Gas Detection: It can detect both VOCs and Hydrogen, covering the three primary sources of off-gas in Li-ion batteries: electrolyte leaks, overcharging, and electrolysis.
UL 61010 Recognition: UL (Underwriters Laboratories) recognition signifies compliance with global safety standards, crucial for monitoring systems in energy storage.
Embedded ISO 17025 Temperature Sensors: These sensors ensure precise temperature monitoring, critical for battery safety and efficiency.

Actionable Insights for Safety

When the GAS-VOC-H2 sensor detects elevated VOC levels, it signals an immediate need for action, such as shutting down the battery system to prevent thermal runaway. One sensor per rack is recommended to ensure comprehensive monitoring.

The GAS-VOC-H2 sensor is an essential tool for any energy storage system using Li-ion batteries. By providing accurate and timely data on VOC and Hydrogen levels, it plays a critical role in preventing hazardous situations, thereby ensuring the safety and longevity of these energy systems.