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SBS-H2 Hydrogen Gas Detector

Hydrogen Sensor and Monitoring System

The SBS-H2 Hydrogen Detector is a complete hydrogen monitoring system with visual and audible alarms.The system comes complete with the main display, a highly accurate hydrogen gas sensor and a 25-ft. cable.


Lead-acid storage batteries emit hydrogen gas while discharging and recharging. Hydrogen concentrations of 4% to 75% by volume in air are potentially explosive. The SBS hydrogen gas detector is designed to allow dissipation and give warning before any concentration reaches the lower explosive limit (LEL) of 4%.  This unit is easy to install and very cost effective.


Includes hydrogen specific sensor for detection and monitoring of H2 gas and relays for remote connection to alarm/monitoring systems and for control of external relays or an exhaust fan.


This device can be used to meet the minimum requirements for your battery room to be in compliance with IEEE Std 484-2002, National Fire Protection Agency (NFPA) Article 64 and Uniform Building Code (UBC) Sect 6400.  Failure to monitor hydrogen gas production and alarm when certain thresholds are reached can void your insurance policy and exposes your company to severe risk should any injury result from a non-passive hydrogen gassing event.



  • SBS exclusive
  • Dual AC or DC power supply connections
  • Ideal for remote locations
  • Provides coverage redundancy in large monitoring spaces (up to 3 sensors)
  • Sensor LEDs indicate which sensor is detecting hydrogen
  • If loss of power, system will open 1% relay
  • Protects life, property and company profits
  • Modular design detector does not require complete replacement for repairs or calibrations



  • Universal power inputs: 110/220 Vac and/or 12-48 Vdc input
  • Push button diagnostic test
  • Audible and visual (strobe) alarms
  • Sensor has a temperature rating of -4° F to 176° F
  • Can operate in a wide range of temperatures and humidity


NRTL/C Certified

  • UL Std. No. 61010-1
  • CAN/CSA-C22.2 No. 61010-1-12



  • Wall or 2-gang junction box mountable
  • Mechanical relays are easily accessible:
  • · Warning 1% relay, 15A @ 120VAC; 10A @ 277VAC; 10A @ 28VDC

    · Alarm 2% relay, 0.5A resistive @ 28VDC

  • Redundant power supply capability (DC power supply will operate as backup power source)
  • SBS-H2 display allows for 3 sensor inputs to increase coverage area
  • Display and relays can be tested by pushing the red button
  • Sensors can be tested in the field with the P/N H2-TESTKIT option



Warning Settings: When 1% hydrogen is present in the air, the yellow warning light will come on and the warning relay contact will close, allowing power to peripherals, such as a vent fan or other devices.


Alarm Settings: When at least 2% hydrogen is present in the air, the red warning light will come on and an audible alarm and a visual strobe alarm activate, with corresponding sensor's LED. In addition, a second alarm relay contact will close, which can be used to shut down the system and initiate a building alarm system or other devices.



hydrogen gas detection system for battery rooms



  - Data Sheet

  - User's Manual

  - User's Manual (pre-March 2016)

  - Test Kit

  - Calibration Kit (pre-March 2016)

  - H2 SDS

  - White Paper - Industrial Settings

  - White Paper - Hydrogen Hazards


SBS-H2 detector/sensor



  • Main body/display
  • Hydrogen sensor
  • 25 ft. cable




Motive Power Ventilation Calculator




  • Substations
  • Battery rooms
  • Uninterruptible power supply (UPS)
  • Battery cabinet systems
  • Battery charging areas
  • Hydrogen fueled back-up power systems






Read article: Hazards of unmonitored hydrogen
in battery installations










Detector can operate exhaust fans and building alarms / SCADA systems:

battery hydrogen sensor diagram





SBS-H2 hydrogen sensor and detector's calibration kit accessory




Accessories & Mounting

Alarm system can be tested in the field with p/n H2-TESTKIT option.

hydrogen sensor with cable



Additional hydrogen sensor with 25 ft. cable. (Also, 50 ft. and 100 ft. cables are available.)

hydrogen detector mounted with junction box



Unit can be powered with either AC or DC power and can be mounted directly to a wall or to an electrical box, making it extremely versatile and user-friendly. Additional mounting options in data sheet.



Sample Hydrogen Scenarios of Hydrogen Detector Placement

SBS-H2: Stationary Hydrogen Gas Detector Placement Location

SBS-H2: Forklift Battery Hydrogen Gas Detector Placement Location


The SBS-H2 includes relays for remote connection to alarm/monitoring systems and for control of external relays or an exhaust fan.



Ordering Information

Part No. Description
SBS-H2 Hydrogen Detector Package


Accessory Ordering Information

Part No. Description
H2-SENSOR-25FT Additional hydrogen sensor with 25 ft cable
H2-SENSOR-50FT Additional hydrogen sensor with 50 ft cable
H2-SENSOR-100FT Additional hydrogen sensor with 100 ft cable
H2-TESTKIT Test kit (includes 1% & 2% hydrogen, regulator, tubing and case) Note: cannot be shipped via air freight
H2-JB 4 11/16" x 4 11/16" 2-gang junction box
E190399 AC Cord 110V, 10A, 10 ft with plug



1% Hydrogen Energizes a relay which can activate exhaust fan or SCADA system/alarm
2% Hydrogen Sounds audible and visual alarms and energizes relay which can be used on SCADA system
Power Source 110 / 220 Vac, 50/60 Hz OR
12-48 Vdc (9-60 Vdc operating voltage)
Size 4.7" L x 4.7" W x 1.2" D (main body/display)