GAI-Tronics 491-204 Manuel - Page 2
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Model 491-204 Mine Dial/Page Telephone
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Automatic circuits in the Mine Dial/Page Telephone "answer" incoming calls and permit the calling
party to page the desired person using a self-contained horn-type loudspeaker. This voice page is
preceded by a distinctive tone and is accompanied by a flashing light to assist in locating the
telephone in dark areas. The flashing light also gives visual notice of the call in high-noise areas.
The flashing light complies with Virginia and West Virginia MSHA regulations.
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A person initiating a call can page someone at a specific location without disturbing personnel at
other locations.
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The All-Call function pages all the stations simultaneously while also reaching those stations using
the system for normal conversations.
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The push button controlled, all-station page operation is activated automatically in the event of a
telephone switchboard failure.
A single pair of wires connects each Mine Dial/Page Telephone to the interface assembly. Each interface
is connected to the telephone switchboard with another corresponding pair of wires.
A person using a Mine Dial/Page Telephone station can access any station or any conventional telephone
connected to that switchboard. If the switchboard is tied into the public telephone system, an individual
can call out or receive calls from any public telephone.
Personnel in hazardous areas have direct contact to all non-hazardous areas with extension telephones
without the purchase of additional communications equipment for these non-hazardous areas.
In keeping with MSHA regulations, at least one GAI-Tronics Model 491-204 Mine Dial/Page Telephone
Station for each interface cabinet must be installed outside of a coal mine.
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