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Avaya Inc.
Installation and Operation
Model EA401
Page 3
Overview
Model EA401 Explosive Atmosphere Telephone
This Explosive Atmosphere telephone provides safe and reliable communication in hazardous
locations, up to and including Class I Division 1. Only standard wiring and fittings are required to
connect the telephone to the system; no barrier is necessary. Since the heavy duty cast aluminum
enclosure is basically soundproof, an external device to signal incoming calls is required.
Features
Enclosure
• cast copper free aluminum with powder coat finish
Internal Sealed Cavities
• completely seal the unit
Keypad
• standard configuration with an additional row of buttons for Last
Number Redial, Link/Flash to access PABX features and Line Release
to duplicate hanging up the handset
• one inch diameter buttons for gloves-on operation
Circuitry Coating
• circuit boards have a UV cured epoxy coating which provides protection
from corrosive agents such as H
2
S, SO
2
, and NH
3,
and environments
with high humidity
Magnetic Reed Hook Switch
• no moving parts, activates when the handset is removed from or placed
in the telephone cradle
Tone (DTMF) Operation
• selectable in the field; factory set to operate to tone (DTMF) exchanges
Intrinsically Safe Handset Operation
• the output from the telephone to the handset passes through an
intrinsically safe barrier ensuring a high degree of safety
Field Replaceable Handset
• the 10’ handset cord is designed for industrial applications and is
attached to the telephone by a connector for ease of replacement
Field Replaceable Fuse
• a fitting in the bottom of the enclosure provides access to the fuse
Hearing-Aid Compatibility
• the handset is compatible with inductively coupled hearing-aid devices