SBS H2 Installation, Operation & Maintenance Instructions Manual page 14

11.0 Troubleshooting and Maintenance
No Power
Verify the AC and/or DC power cables are installed per the connection diagram on page 11.
Relays
The SBS-H2 system was designed for the relays to operate in a failsafe condition when the power
supply is interrupted. If the fan connected to a relay runs as soon as the unit is powered on, the unit
has been wired for the use of the Normally Open contact instead of a Normally Closed contact.
False Alarms
Each sensor has been calibrated for the detection of hydrogen gas, however any combustible gas that
comes in contact with a sensor has the potential to activate the warning and/or alarm relays. Contact
with any individual or combination of the following gases could trigger false alarms and/or contaminate
a sensor.
Gases include but are not limited to:
-
Acetone
-
Acetylene
-
Ammonia
-
Benzene
-
Butane
- n-Butyl Acetate
- Carbon Dioxide
-
Carbon Monoxide
-
Ethane
-
Ethanol
- Ethyl Acetate
If a sensor's warning or alarm condition is reached, ventilate the area with clean air. This should
reduce the concentration of most gases and the warning or alarm condition should clear.
Note - when a warning occurs at 1%, the warning will not clear until concentrations drop below 0.5%.
Similarly, when an alarm occurs at 2%, the alarm will not clear until concentrations drop below 1.5%.
Avoid installation in highly corrosive environments where high densities of hydrogen sulfide, sulfur
oxide, chlorine, hydrogen chloride, etc. may be present. These gases can cause corrosion of the
element and the power leads to the circuit board.
A sensor's output characteristics can be affected if the sensor becomes contaminated or exposed to
heavy alkaline metals.
A sensor cannot operate in a zero or low oxygen content atmosphere.
If a sensor collects water condensation, its characteristics may temporarily drift. However, light levels of
condensation under normal indoor use should not pose a significant problem with performance.
Storage
The longer a sensor is stored prior to being energized, the longer the warm up and stabilization period
may become. Storage Humidity Range: 5 - 95% non-condensing.
SBS-H2 Users Manual, Rev. 07-17-TNEMH2
-
Ethyl Ether
-
Ethyl Oxide
-
Gasoline
-
Heptane
-
Hexane
- Hydrogen
- Hydrogen Cyanide
-
Hydrogen Sulfide
-
Isopropyl Alcohol
-
Methane
- Methanol
Page 14
-
Methyl Ethyl Ketone
-
Nitric Oxide
-
Nitric Dioxide
-
Propane
-
Propylene Oxide
- Styrene
- Sulfur Dioxide
-
Toluene
-
Turpentine
-
Vinyl Acetate
- Xylene
July 2017