Teledyne 2240 – Portable Handheld Hydrogen Leak Detector, 3rd generation (updated 1/31/11) - Manual (Page 14)

Handheld Hydrogen Leak Detector Model 2240
Teledyne Analytical Instruments Page 14 of 30
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.
4.4 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 4.6).
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:
> 0.002 > 0.005 > 0.010 > 0.022 > 0.046 > 0.10 > 0.22 > 0.46
> 1.0 > 2.2 > 4.6 > 10 > 22 > 46 10
0
> 0.001
Hydrogen Meter