6
held at the leak site. This mode may
require frequent re-adjustment of the
BALANCE
control to maintain the required
2–3 ticks per second that indicates
proper adjustment and calibration for
all three sensitivity switch positions. In
this mode you may notice sensitivity
is slightly greater (10–20%) than the
100% auto zero mode. This is normal.
Sensor Heater Adjustment
The
sensor’s
HEATER
ADJUSTMENT
con-
trols the sensitivity of the unit. A heat
setting that is too high causes instability
due to excessive sensitivity and short-
ens sensor life. The Low, OK, and High
LED indicators in conjunction with the
HEATER
ADJUSTMENT
and the
CALIBRATION
REFERENCE
bottle, is a unique system
for setting the correct sensor heat (sen-
sitivity) for optimum calibrated perfor-
mance and long sensor life.
The unit is preset for optimum initial
operation. To check the setting, slide
the
LEAK
SIZE
switch to its
SM
(small)
position, turn
ON
the unit and allow it
to stabilize (approximately 2 minutes).
When stabilized, at 2–3 clicks per sec-
ond, briefly touch the
CALIBRATION
REFER
-
ENCE
bottle with the probe (after remov-
ing the sticky label disc from the top of
the bottle). If adjusted properly, the red
Low LED light will go out and the green
OK LED will briefly light. This indicates
the sensor heat/sensitivity is adjusted
for optimum performance.
If the red LED Low light remains on
when you briefly touch the bottle, the
HEATER
ADJUSTMENT
is set too low and
must be turned slightly clockwise; after-
which, allow the unit to stabilize about
