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making certain that the 3 pins of the sensor are inserted into the appropriate pins inside the
probe end. Verify that the sensor has been properly inserted into the probe. Next install the
rubber washer as shown in Figure 2, followed by the metal washer. Insert new filter and screw
on the nozzle while firmly holding the probe end with the other hand. DO NOT USE ANY TOOLS in
tightening the tip assembly, firmly hand tighten only.
LEAK TEST VIAL
A Leak Test Vial is supplied with your leak detector to verify that the leak detector is operating
correctly.
1. Turn the leak detector ON and wait until the unit completes its warm-up sequence. The READY
LED will be displayed and the audible "beep" will begin, unless muted. Set the sensitivity level
to MEDIUM.
2. Remove the vinyl cap from the vial to expose the small leak hole as shown in Figure 3A below.
DO NOT UNTWIST THE BLACK CAP FROM THE BOTTLE.
3. Briefly place the probe tip close to the small hole, as shown in Figure 3B until an audible alarm
is generated. This will be an indication that the unit is operating properly. Reseal the vial with
the previously removed vinyl cap and return to the case.
PRECAUTION!
If the test vial is held in close proximity of the probe tip for an extended period of time, the probe
sensor can saturate. The leak detector will interpret this as a contaminated atmosphere associat-
ed with a large refrigerant leak.
This precaution also applies when locating leaks. Refer to Quick Start Tips On How To Find
Leaks, step #2 for further clarification.
If the above precaution is not followed, the CA (contaminated atmosphere) LED may appear on
the display, after a self-calibration process. The unit can be used to detect leaks provided the
READY LED appears on the display. The CA LED indication will eventually disappear when the unit
returns to a non-contaminated environment and undergoes a self-calibration process.
SENSITIVITY TO AUTOMOTIVE CHEMICALS
Due to the chemical similarity between the miscellaneous automotive products listed below and
the chemical properties of refrigerants, some of these chemicals will interfere with the effort of
isolating refrigerant leaks in automobiles. For this reason, the chemicals that the leak detector
responds to should not be present in close proximity of the suspected leak location.
BRAND OR CHEMICAL NAME
Windshield Washer Solvent
Motorcraft Spot & Stain Remover
Motorcraft Metal Brake Parts Cleaner
Motorcraft Penetrating and Lock Lubricant
Motorcraft Break Parts Cleaner
Motorcraft Clear Silicone Rubber
Antifreeze/Coolant
Gunk Liquid Wrench
Motorcraft Natural Citrus Hand Cleaner
Motorcraft DOT3 Brake Fluid
Motorcraft Spray Carburetor Tune-Up Cleaner
Motorcraft Door Latch Grease
Loctite Biodegradable Cleaner & Degreaser
Dexron ATF
Mineral Engine Oil
Silicon Brake Grease
3M Gasket Adhesive
REPLACEMENT PARTS
Replacement parts and accessories for the 55900 Leak Detector are available through the same
dealer from whom you purchased the instrument or from Mastercool Inc.
REF. #
DESCRIPTION
1.
Blow Molded Plastic Box
2.
Leak Test Vial
3.
Battery Cover
4.
Sensor
5.
2 "C" Batteries
6.
Sensor Protector
7.
Replacement Filters (3)
Figure 3A
www.mastercool.com
Figure 3B
RESPONSE
CLEARS IN 20 SEC
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
N/A
Yes
Yes
No
N/A
Yes
Yes
No
N/A
No
N/A
Yes
Yes
Yes
Yes
MC PART #
55800-PB
55800-VL
55900-BATCOV
55800-SEN
BATTERY "C"
55100-10042
55800-FILTER
5
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