gtc060601
Mine Dial / Page Telephone
Models 491-204 and 495-001
GAI-TRONICS®
Features
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Selective and All-Call Paging
Private Conversations
Can place and receive outside calls
Each station allows simultaneous,
independent conversations on each phone
Emergency page function is automatically
enabled if switchboard is out of order, or if
power fails
Flashing light designed for use in noisy
areas where a ring might not be heard;
light also improves ability to locate phone
in dark areas
For ease of installation, each interface
cabinet supports up to 80 extensions
8-hour battery backup
The GAI-Tronics Mine Dial/Page Phone system provides the convenience of a telephone station plus
paging capabilities, in gaseous or dusty locations
where standard telephone equipment is considered
too hazardous. Mine Dial / Page Telephones are rated
as “permissible” for use in coal mines by the Mine
Safety and Health Administration (MSHA) of the
United States Department of Labor (Approval 9B-221).
The System is used in conjunction with a public or
private branch exchange (PBX). Each station in the
system is made up of three components; (1) the Mine
Dial/Page Phone station mounted at the point where
needed, (2) a GAI-Tronics interface card mounted
outside the hazardous area and electrically connected
between the station and the telephone exchange,
and (3) an interface cabinet. The GAI-Tronics Interface
Cabinet houses MSHA approved safety barriers,
interface cards, electronic switching, power source,
and all the equipment necessary to interface the Mine
Dial/Page Phone with the customer’s plant telephone
system.
Once installed, the Mine Dial station can place a call to
any Mine Dial/Page Phone, generate a page to a
specific Mine Dial/Page Phone, page all Mine
Dial/Page Phones, or place a call to a standard
telephone. For maximum safety, in the event of a
power failure or if the switchboard is down for any
reason, the Mine Dial/Page Phone can still generate
pages and allow two-way communication.
Mine Dial / Page Telephone
Models 491-204 and 495-001
GAI-TRONICS®
MODEL 491-204 MINE DIAL/PAGE PHONE
Line Voltage: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 VDC
Supervisory Current: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 mA DC, max.
Audio impedance, input: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200 ohms, nominal
External controls (2): . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Push-to-operate (in handset)
Emergency Page (on panel)
Internal Controls (2): . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Speaker volume sidetone
Microphone: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Dynamic, noise-canceling
Speaker: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Dynamic, horn-loading
Power Supply: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Internal dry battery, 12 volts
Page/Indicator Lamp: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66 Flashes per minute; 6.6% duty cycle
Approvals: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . MSHA Permissible, Approval Number 9B-221
MODEL 495-001 INTERFACE CABINET
Number of Channels: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80 Max.
Audio Impedance, switchboard: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 600-900 ohms
Metering: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Power supply voltage; load current;
Battery charging current
Transient Isolation - Telephone circuit to corresponding mine circuit: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 500 volts min.
Transient Limiter - across mine lines: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 volts, peak
Normal Power Requirements: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120 volts, 50-60 Hz.
Standby Power Operation: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 hours, minimum via rechargeable battery
SWITCHBOARD REQUIREMENTS
Station Selection: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DTMF (Dual Tone Modulation Frequency) Operation
Ringing: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bridged across line 85 volts nom., 20 Hz.
Open-circuit voltage: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 VDC, nominal
Supervisory Current: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 mA., 20 mA min.
Auxiliary Requirements: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1. Page Audio: 0 dBm, 600-900 ohms
2. Page Control: “A” contact, normally open
3. Monitor: 48 VDC nom., 1200 ohms,
Distributor:
max. source/line resistance
GAI-TRONICS
®
USA
UK
Italy
Malaysia
Australia
Toll Free: 1 (800) 492-1212 Tel: (610) 777-1374 Fax: (610) 796-5954 www.gai-tronics.com
Tel: +44 (0)1283 500500 Fax: +44 (0)1283 500400 www.gai-tronics.co.uk
Tel: +39 02 48601460 Fax: +39 02 93663110 www.gai-tronics.it
Tel: +60-3-8945-4035 / 8945-7348 Fax: +60-3-8945-4675 www.gai-tronics.com
Tel: 011-61-28-851-5000 Fax: 011-61-29-899-2490 www.austdac.com.au
Quality Management System Certified by DNV - ISO 9001:2008. The policy of GAI-Tronics is one of continuous improvement; therefore the company reserves the right to change specifications without notice.
Pub. 060601 Rev 9/22/2013
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