Replacing The Sensor; Manual Calibration - MasterCool 55800 Manuel D'opération

batteries with the polarities shown in Figure 1. Re-install the battery cover and secure with the
cover screw.

Replacing the Sensor

To replace the sensor, firmly grasp the flexible probe near the end with one hand and use the
other hand to unscrew the nozzle portion from the threaded probe tip in a counter-clockwise di-
rection. Next, remove the metal washer, the rubber washer and the sensor in that order. Observe
the orientation of the key on the sensor being removed. It would be advisable to replace the
filter inside the nozzle at the same time. To remove the microfiltration membrane from inside the
nozzle, the assistance of a long thin object such as an o-ring pick or equivalent will be required.
When installing a new sensor, orient the tab key on the sensor with the keys slot on the probe,
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. A green
READY will be displayed on the LCD 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. Place the probe tip close to the small hole (3 - 4 mm) on the leak test vial for no more than 3
seconds, as shown in Figure 3B, until an audible alarm is generated. This will be an indication
that the unit is operating properly.
NOTE: Any duration longer than 3 seconds will saturate the sensor. See precautions below.
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.
When this occurs, the letters CL will appear on the screen and a flashing WAIT will be displayed
for several seconds, while the leak detector is re-calibrating itself to the new environment. This
process may take several seconds to complete. A green READY light will appear on the display,
alerting the user that the unit is ready for use.
If the above precaution is not followed, CA (contaminated atmosphere) may appear on the
display, after a self-calibration process. The unit can be used to detect leaks provided the READY
legend appears on the display. The CA indication will eventually disappear when the unit returns
to a non- contaminated environment and undergoes a self-calibration process.

Manual Calibration

The unit will continually self adjust its operation in order to detect leaks at an optimum level.
When it does this a 'CL' will flash in the display, the wait indicator will turn on and the ready light
will be off for a few seconds until this operation is completed.
4
Probe
Figure 3A
www.mastercool.com
Cover
-
Rubber Metal
Key Sensor Washer Washer Filter
Screw for
removing
or securing
the battery
cover
+
Nozzle
Figure 3B
Figure 1
Figure 2