may activate the internal relay at a slightly lower concentration level, but normally should not
reach the point of activating the internal alarm.
If the concentration of hydrogen gas in the air surrounding the sensor reaches 1% by volume,
the yellow LED will light and the 1% internal relay will close to activate a remote fan and/or
alarm. A 4 second delay prevents false activation.
Should the concentration reach 2%, the red LED will flash, the internal 80 db warning alarm will
sound, and the 2% internal relay (dual-relay model only) will close. The 1% relay will remain
closed & the yellow LED on.
When the concentration decreases below 2%, the red LED will turn off, the internal alarm will
stop, and the 2% relay (dual-relay model only) will open. When the concentration falls below
1%, the 1% relay will open and the Yellow LED will turn off.
The sensor is calibrated at room temperature and humidity at sea level. It is slightly more
sensitive at higher temperature, humidity or altitude. In these situations, the detector may
activate at a slightly lower gas concentration. This, however, should not noticeably affect its
operation nor require any adjustment.
Note: The sensor detects several other combustible gases in addition to hydrogen. Its sensitivity
to these other gases, however, is much lower than its sensitivity to hydrogen. Although additive,
the presence of other gases is unlikely to falsely activate the detector.
Calibration
This detector has been calibrated at the factory for hydrogen gas and should not be adjusted in
the field. DO NOT ATTEMPT TO FIELD CALIBRATE THIS UNIT.
Testing (after the ac power is on for 10 minutes)
A "push-to-test" button is located on the unit's front. Push and hold this button for approximately
10 seconds to test the unit's electronic circuitry. The caution and warning LEDs will light in
sequence; the relays will activate whatever is connected to them and the internal warning alarm
will sound.
Note: The "push-to-test" button does NOT test the sensor itself.
Unless the detector becomes overly sensitive, recalibration or replacement of the sensor board
should not be necessary for several years. For safety sake, however, replace the sensor board
every five years.
Warning: This detector is added protection, not a substitute, for prudent safety measures where
hydrogen gas is present. For large or highly sensitive areas, use two or more detectors.
To Next Page
Loading...