Garrett MT 5500 User Manual page 35

10.15 ADJUSTING VOLUME
To adjust the volume of the alarm, the operator should first press the VOLUME touchpad. Then use
the + and - touchpads to regulate the volume. Finally, press the OPERATE touchpad to resume nor-
mal operations.
10.16 NUISANCE ALARMS
Any metal detector will occasionally register what is called a "nuisance alarm," triggered by electri-
cal or mechanical noise from the environment. On most walk-through detectors such an alarm can
sound when a person carrying no detectable metal is passing through the archway, or even when
nobody is passing through. Audible nuisance alarms are minimized by the IR Sensor. This sensor
requires that a person must be passing through the unit for any alarm to sound. Because the IR
Sensor can be turned off by a supervisor, operators should always know whether it is functioning or
not.
It is important to remember that after power has been turned on, the MT 5500 is operating at all
times. Its IR Sensor capability inhibits the alarm only when there is no object or person within the
archway.
No detector, however, is immune from nuisance alarms caused primarily by electrical
disturbances from large motors, computers, fluorescent lighting or many other sources. An operator
should not be overly concerned about nuisance alarms, but should accept that they can happen and
be ready for them. Of course, it will be necessary to retest any person passing through the detector
when a nuisance alarm is believed to have sounded.
Because of the high level of design quality represented by the MT 5500 and its IR Sensor, it can be
expected to produce relatively few "nuisance alarms" when installed properly. Nevertheless, opera-
tors should always follow instructions from supervisors about reporting them.
On rare occasions a nuisance source might trigger the alarm just as someone is passing through
the detector. An operator should never try to guess about the source of such an alarm, and it should
never be assumed that the alarm is a nuisance. There have been occasions when an individual
would intentionally bump against a detector while passing through it and try to blame an alarm on
the bump.
If an alarm sounds for any reason while a person is passing through the archway, that person must
be asked to walk through the unit again and/or be examined for metallic objects with a hand-held
detector.
There will be no exceptions.
10.17 TAMPER ALARM
Whenever the ACCESS touchpad is pressed, the detector will begin "beeping" for about ten (10)
seconds or until a four-digit numerical access code is entered with the touchpads. During these ten
(10) seconds, the detector will sound an alarm if any person or object passes through the archway.
When less than four touchpads are pressed or if no attempt is made to enter a code within ten (10)
seconds, the detector will return to normal operation. After the ACCESS touchpad is pressed, if an
unauthorized four-touchpad code is entered, an audible Tamper Alarm will sound three loud "beeps."
The detector will then return to normal operation.
Any attempt at access to the detector's controls will also be indicated by an increase in the
SEQUENCE code as reported on the LCD display. Any unauthorized attempt at access that acti-
©2006 GARRETT METAL DETECTORS
MT 5500
User Manual
35 PN 1530200.F.0506