Protech Audio 685 - Manual

Protech Audio Corp., 192 Cedar River Road, Indian Lake, New York 12842 Voice 518-648-6410 Fax 518-648-6395
MODEL COVERED
INTEGRA III SYSTEM
PROTECH
®
685
The Model 685 features a transformer isolated input,
in order to allow the unit to be connected to circuits without
unbalancing the line. One set of input pins is used for line
level circuits, while another set is used for 25 and 70 volt
distributed audio speaker lines.
The audio is fed from the secondary of the input
transformer to a tuned detector circuit. The detector
circuit is tuned to react to a 25Hz, constant magnitude
tone. When the circuit detects the presence of this tone,
it turns on the on-board relay. If the tone should drop in
level, or completely disappear, the detector circuit turns
off the relay.
The on-board relay contacts are wired, by the installer, to
a remote annunciator panel. This panel usually contains
LED indicators, to alert personnel of a circuit failure. The
relay contacts may be wired to several remote annunciator
panels if necessary. The relay contains an adjustable drop-
out delay, to prevent nuisance tripping.
The Model 517 25Hz Notch Filter may be used in
conjunction with the Model 685, to process program
material, and remove any 25Hz content. For more
information, contact: SALES ENGINEERING The Model 685 Tone Supervisor Card is designed
for use in professional audio applications, which
require constant, automatic supervision of audio
equipment.
The card detects the presence of a 25Hz signal, even
when program material is present. The 25Hz signal may
be fed into the audio signal path at any point
in the system. There are INTEGRA III SYSTEM
cards available to help facilitate the mixing of the
supervisory tone into the audio system. Feeding the
supervisory tone into the audio system at the earliest
possible point, will allow the supervisor card to
monitor the operation of more equipment.
The Tone Supervisor card is capable of monitoring
audio circuits from 600 ohms to 70 volt distributed
systems. The input of the card is balanced, bridging,
transformer isolated.
Typical applications are multi-zone public address
systems, intercoms, paging systems, training systems,
and monitoring systems. The actural application is
found in buildings such as airports, factories,
courthouses, casinos, convention centers, libraries,
military facilities, racetracks, and corporate boardrooms.
685
TONE SUPERVISOR CARD
INSTALLATION & OPERATION MANUAL
1/06
Model 685 Shown
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