Test Products International 755 - Manual (Page 3)

matic zeroing at start up. The GREEN ready light
will then illuminate if there is ample battery
power. If the GREEN light flashes RED it is nec-
essary to change the batteries.
3. Approach suspected leak areas with the sensor
until the tick begins to increase. When the tick
increases and the LED's illuminate showing only
RED in color, do not move the sensor from the
area, press the RESET button and wait approxi-
mately 2 seconds for a stable tick to begin again.
The LED's will illuminate from GREEN to RED
indicating up to 14 levels of leakage. When all
RED LED's appear the leakage is at its maximum
level. The RESET button must be pressed again.
4. To find very small leaks use the same procedure
as listed in paragraph 4, but increase the sensi-
tivity by pressing the "Sen ?" button. The LED's
will become RED in color and increase in num-
ber indicating higher sensitivity. When all 7
RED LED's are illuminated the unit is in its most
sensitive mode.
5. After selection the GREEN LED will illuminate
and the tick will be faster.
6. To reduce sensitivity press the "Sen ?" button.
When this is selected the number of RED LED's
will decrease corresponding to lowered sensitivi-
ty.
7. There are 7 levels of sensitivity. When initially
powered the sensitivity is preset to the mid-
range (4 RED LED's illuminated)
8. If the GREEN LED fails to illuminate or begins to
flash, change the batteries. The "BAT. Check" can
be pressed to indicate relative battery strength.
When all LED's illuminate GREEN, the batteries
are at full strength.
9. A mute button disables the alarm sound that
indicates gas concentrations in excess of 0.5
oz/yr of R-22 (or equivelent).
10. An earphone can be plugged into the earphone
jack when using the instrument in noisy environ-
ments.
11. If the tick is erratic, check the sensor for tight-
ness and cleanliness. Cleaning the sensor with
alcohol is permitted as long as the instrument is
turned off.
12. If the instrument does not perform, replace the
sensor. Sensor replacement is recommended
annually.
13. To turn off press and release the ON/OFF button.
Battery replacement
1. Remove the battery compartment door from the
bottom of the handle by sliding the door away