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The manual mode is also an effec-
tive means to determine if a large
leak of any refrigerant exists prior to
searching for leaks (see “Adjusting the
Sensitivity”).
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 readjustment of the Manual
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 auto-
zero mode. This is normal.
Heater Adjustment
(for optimum performance and calibration)
The Calibration Reference Bottle sen-
sor heater circuit controls the sensitiv-
ity 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 conjunc-
tion 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 minutes). When stabilized, at 2-3 clicks
per second, 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