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3
OPERATION
3.1 STARTUP
To power-up the HY-ALERTA™ 500, press and hold the ON/OFF button until the Controller LCD display
indicates an operational message.
Warning: Only power-up the instrument in a hydrogen-free environment.
After power is on, the instrument takes about ten minutes to warm-up. During this time the LCD displays a
countdown to completion and the Probe Tip LED is amber. The following operations occur:
The Wide Range Sensor® reaches operating temperature.
A system self-test is run.
Upon successful completion of the above tasks the instrument zeroes itself and automatically switches to
normal operation. If an error is detected the instrument will display an error code (see Section 10).
3.2 SHUTDOWN
To power-down the HY-ALERTA™ 500, press and hold the ON/OFF button for approximately two seconds
until the Controller LCD display turns off.
4
BATTERY LEVEL
After power-on the BATTERY LED indicates the current battery level (times are approximate, and may vary as the
battery ages.)
Color
Green
Amber
Red
A fully charged battery should last 10 to15 hours, depending on use.
There is a small load on the battery when the unit is powered off. This load will discharge the battery of the unit in it's
powered off state in about 6 months. Customers that do not use the device frequently should charge the battery and
perform a bump test with hydrogen gas every one to three months to keep the battery charged and ready for use.
4.1 NORMAL OPERATION
During normal operation the instrument is detecting and reporting the hydrogen concentration near the probe
tip sensor. Hydrogen readings are displayed on the controller LCD and the probe tip LED bar graph array.
Note that due to the extreme sensitivity of the sensor, it may take several minutes to return to a near zero (less
than 0.001%) reading after exposure to hydrogen. If the instrument does not return to an indication of less
than 0.001% after 5 minutes in a hydrogen-free environment, then invoke the Reset operation (See Section
4.3).
The upper line of the Controller LCD indicates a numerical value or range for the percent hydrogen
concentration or peak hydrogen value. The lower line is used to display the hydrogen meter, a logarithmic bar
graph ranging from 0.001% (10 ppm) to 100% hydrogen by volume. An open box on the bar indicates the last
peak value obtained and filled boxes indicate the current value. The following figure describes how to interpret
the hydrogen meter:
90000002 R13
more than 60 minutes of operation remaining
approximately 15 to 60 minutes of operation remaining
less than approximately 15 minutes of operation remaining
TM
HY-ALERTA
500 HANDHELD HYDROGEN LEAK
DETECTOR OPERATING MANUAL
Meaning
Page 7 of 14
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