CPS LS790B Manual De Usuario página 4

INSTRUMENT CONTROLS
1. ON/OFF Keys: Turns unit on or off.
2. ALARM SELECT Key: An audible alarm sounds when the unit
is initially turned on. Press the ALARM SELECT key once to
turn the visual alarm on. Press the key again for a combination
of the audible and visual alarms. Pressing the key a third time
will return the unit to its initial audible only setting.
3. SENSITIVITY Key: The LS790B offers 10 ranges of sensitivity
that may be selected depending on the type of refrigerant
you're working with and the size of the leak. The lowest sensi-
tivity range is automatically selected each time the instrument
is switched on. Depress and hold the SENSITIVITY key to
change the sensitivity range. The LED will move left to right (LO
to HI) until the key is released.
4. LOCK-OUT Key: Use this feature when faced with searching
for a leak in a highly contaminated area. This mode of opera-
tion measures and records in memory the highest concentra-
tion of refrigerant gas detected since the mode was selected or
the CLEAR button was depressed. Any concentration of gas
less than the highest recorded concentration is locked-out or
ignored, thereby eliminating the effects of background contam-
ination. A distinct two-tone alarm will sound when the probe is
in the area of the highest refrigerant concentration. This will be
the leak source.
5. CLEAR Key: This key is used to accomplish two tasks. First, it
is used to reset the memory locations stored in the micro-
processor when the unit is in the LOCK-OUT mode of opera-
tion. Secondly, it is used to re-calibrate the unit to surrounding
ambient conditions.
SAEJ1628 INSTRUCTIONS
SAE J1628 Recommended Procedure
NOTE: On automotive A/C systems, test with the engine not in
operation.
1. The air conditioning or refrigeration system should be charged
with sufficient refrigerant to have a gauge pressure of at least
340kPa/50psi when not in operation. At temperatures below
15°C/59°F, leaks may not be measurable, since this pressure
may not be reached.
SENSITIVITY INCREASES
AS LED MOVES TO RIGHT
USE LEVELS 4-7 FOR R-134a
LO
1 2 3 4 5 6 7 8 9 10
*Replace Batteries When 5th LED Flashes
3
HI