3
SBS-H2 Users Manual
Rev 1.4
January 6
th
2013
1.0 Overview
Hydrogen gas detectors act as monitors that provide alarms as well as control functions
such as controlling exhaust fans, remote alarm and signaling, building management
interfacing and more for the protection of your facility.
Batteries on charge emit hydrogen gas after reaching 80% of the recharge point.
Examples of typical hydrogen emissions per lead-acid battery are:
Battery Size
Hydrogen Gas
12 Volt / 500 Amp-Hour
3.5 Cubic Feet/hr.
24 Volt / 720 Amp-Hour
10.1 Cubic Feet/hr.
36 Volt / 935 Amp-Hour
19.8 Cubic Feet/hr.
48 Volt / 850 Amp-Hour
23.9 Cubic Feet/hr.
Concentrations of 4.1% to 75% H2 mixed with air can be explosive.
Sparks or hot surfaces
can ignite them. A hydrogen gas detector in your battery room will provide a warning and
facilitate dissipation of hydrogen concentrations before they reach the lower explosive limit
(LEL) of 4.1%.
2.0 Benefits
In addition to protecting your employees and your property, the detector may also
reduce the following costs:
Electricity - Heating - Air Conditioning
Instead of continuously running an exhaust fan to prevent hydrogen gas accumulation, use the
detector to activate the fan only if the concentration reaches 1%.
Insurance
Installation of a detector in areas where batteries are charged may result in a premium
reduction.
3.0 How it Works
Should the concentration of hydrogen gas in the air surrounding the sensor reach 1% by
volume, the "1% Warning" yellow LED will light and the 1% internal relay will energize. Should
the hydrogen gas concentration reach 2% by volume, the "2% Alarm" red LED will flash and an
alarm will sound.
Either relay can be used to activate a remote exhaust fan and/or alarm.
Automatic operation, continuous monitoring, high sensitivity & stability,and solid state reliability.
The unit is also intrinsically safe using 120/240 VAC 50/60 Hz or 12-48 VDC operating voltages,
low in cost and easy and versatile to install.
Pre-March 2016 Version
