8
the tip at about one inch per second
along seams or joints suspected of
leaking. When the probe encoun-
ters a leak, both the audio pitch and
the flashing rate of the neon lamp
will increase. Both will continue to
respond at the faster rate as long as
the probe is held at the leak.
9. For detecting much larger or smaller
leaks, set the leak size switch to the
appropriate range LG or MED, readjust
the balance control for slow ticking
(1–3 ticks per second), and probe
for leaks as in the previous step. The
calibrate reference cannot be used to
calibrate these two ranges. The factory,
however, can supply leak standards
of any value required for verification of
capability to specific leak rates.
Sensor Life Extension
The H-10G provides a sensor adjust-
ment that substantially extends sensor
life. This procedure also provides for a
more accurately calibrated sensitivity
throughout the sensor life, and allows
compensation for abnormally high or low
line voltages (see
Maintenance
section).
The sensor heat control is a screw-
driver adjustment accessible through a
hole on the bottom of the case. As the
H-10G is used and the sensor ages, its
sensitivity will gradually decrease.
The overall sensitivity and calibra-
tion of the H-10G may be restored by
gradually adjusting the sensor heat
control clockwise until finally, with a fully
aged sensor, the control knob will be
turned clockwise to indicate 2 o’clock
(fig. 4). After that, when the sensor
fails to respond properly, replace the
sensor following the procedure in the
Maintenance
section and readjust the
sensor heat control back to 7 o’clock
