Owner's Manual

7
Manual Mode
In the Manual Mode the auto-zero
circuit is disabled. The unit will not zero out
the leak if the probe is held over the leak
site. This mode may require frequent read-
justment of the Manual Balance control to
maintain the required 2-3 ticks per second
that indicates proper adjustment and calibra-
tion for all three sensitivity switch positions.
In this mode you may notice sensitivity is
slightly greater (10-20%) than the auto-zero
mode. This is normal.
Heater Adjustment
(for optimum performance and calibration)
The Calibration Reference Bottle sensor
heater circuit controls the sensitivity of the
unit. A heat setting that is too high causes
instability due to excessive sensitivity
and shortens sensor life. The LOW / OK /
HIGH LEDs in conjunction with the Heater
Adjustment and Calibration Reference Bottle
is a unique system for setting the correct
sensor heat (sensitivity) for optimum perfor-
mance and long sensor life.
The unit is pre-set for optimum initial
operation. To check the setting, slide the
mode switch to AUTO, turn ON the unit and
allow it to stabilize (approximately 2 min-
utes). When stabilized, at 2-3 clicks per sec-
ond, briefly touch the Calibration Reference
Bottle with the probe (after removing the
sticky label disc from the top of the bottle).
If adjusted properly the red LOW LED will
go out and the green OK LED will briefly
glow. This indicates the sensor’s heat/sensi-
tivity is adjusted for optimum performance.
If the red LOW LED remains on when you
briefly touch the bottle, the sensor heat is
set too low and the Heater Adjustment must
be turned slightly clockwise. Allow unit to
stabilize about one minute and retest. Repeat