SBS H2 Installation, Operation & Maintenance Instructions Manual page 9

Mounting Location
Hydrogen is colorless and odorless; the lightest of all gases, and thus rises. The sensor should be
installed at the highest, draft-free location in the battery room, cabinet or compartment where
hydrogen gas would accumulate.
The detector measures hydrogen gas concentration in the air immediately surrounding the sensor.
The area one sensor will monitor depends on the properties of the battery compartment or room.
Hydrogen gas may accumulate in several areas of the battery compartment or room and multiple
sensors/detectors may be necessary.
The main control can be mounted wherever is convenient for the user, but should be within the cable
length range to connect to each sensor.
The sensor should be mounted at the highest, draft-free location in the battery room, cabinet or
compartment. Each sensor connects with the main control via the cable.
Carefully remove the main control cover by removing the two screws located on the front of the cover.
Attach the main control to the wall, ceiling or optional junction box using the mounting holes at the top
and bottom of the main control's mounting plate.
After the power and relay wiring is complete, connect each cable from main control to each sensor
and refasten the main control cover.
Power Options
The detector has terminal blocks for connections to a single-phase 120/240 Vac 50/60 Hz power
source (Terminal J8), and/or a 12-48 Vdc power source (Terminal J9). The power supply inputs are
redundant, so the unit can use the DC input as a backup source.
Relays
The detector has two (2) internal alarm relays:

1% warning relay (Terminal J6) is activated when a sensor detects 1% concentration of
hydrogen gas. The 1% relay's dry contacts are rated at 10A/250 Vac, sufficient for most 1/3
HP exhaust fans.

2% alarm relay (Terminal J3) is activated when a sensor detects 2% concentration of
hydrogen gas. The 2% relay's dry contacts are rated for 0.5A/28 Vdc.

Note: For higher current requirements, add an external relay.
Mounting Options
Junction Box Mounted
For 120/240 Vac power, use 18-3 gauge stranded wire.
For 9 - 58 Vdc power, use 18-2 conductor insulated wire.
For relay wires, use stranded wire. Maximum wire size for connector terminations is 14 AWG.
Stranded conductors must be terminated in a manner to prevent shorting from one terminal to another
by a loose strand. Tin the wires with solder if required.
Wall Mounted
For 120 Vac power, an 18-3 gauge insulated line cord is required.
For 9 - 58 Vdc power, use 18-2 conductor insulated cable from the DC supply.
For relay wires, use stranded wire. Maximum wire size for connector terminations is 14 AWG.
SBS-H2 Users Manual, Rev. 07-17-TNEMH2 Page 9 July 2017