Sensor Status Indicator; Audible / Visual Alarms - Mute Feature - ATP ZX-1A Heated Pentode Manuel De L'utilisateur

The base beeping tone is also an indication of sensitivity level.
- In High sensitivity the unit emits two quick beeps approximately once every two (2) seconds, in
fresh air.
- In Low sensitivity the unit emits only one beep, approximately once every two (2) seconds, in
fresh air.
NOTE: In high sensitivity the unit is extremely sensitive to HFC compounds (e.g. R134a),
responding to levels below 0.1 ounces/year (3grams/year). If searching for large leaks of HFC's,
new azeotrope blend refrigerants (R400 series) or any size HCFC or CFC (e.g. R22 or R12)
leaks, it is best to start your search in Low sensitivity.

Sensor Status Indicator

The unit's circuit has the ability to automatically diagnose and indicate the sensor's status.
Whenever the unit is energized, the circuit automatically senses the condition of the sensor and
can detect a failed or missing sensor.
As the sensor ages the circuit will note and indicate this to the user. Initially, an "Old Sensor
Indication" is displayed by flashing the Constant Power Indicator. If this indication appears, you
should immediately obtain a replacement sensor. However, it is not necessary to replace the
sensor before the "Failed Sensor Indication" is received.
If the circuit detects a failed or missing sensor, the 2nd through 6th LEDs will turn red and flash
quickly. The 1st LED will continue to display the battery status as described above. Additionally
the internal pump will be shut down to prevent unnecessary battery drain.
If this indication appears refer to the Maintenance Section on page 13 for service instructions.
Audible / Visual Alarms – Mute feature
The unit features two primary alarm indications – an internal speaker that produces a multiple
frequency tone, and a series of Tri-color LEDs that will provide an incremental indication of leak
detection and proportional leak size.
You may choose to activate both the audible and visual alarms, or solely the visual alarm. Upon
power on, the unit will activate both. If you wish to cancel the audible alarm, or 'Mute" the unit -
Press the key.
This will mute the internal speaker, and a detection will be indicated solely by the LED display.
Press the key again, at any time, to reactivate the internal speaker.
The LEDs provide a tri-color, proportional indication of leak intensity. The 2nd through 6th LEDs
are used for this indication, while the 1st LED always remains an indication of battery strength.
See figure 5.
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