Table of Contents
Advertisement
Guardian Telecom Inc.
Model EXT-401 Explosion Proof Telephone
This explosion proof telephone provides safe and reliable communication in hazardous locations, up
to and including Class I Division 1, (see Figure 13 - I.D. and Compliance). 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. The signaling device may be actuated by an optional internal or external ring detect relay.
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 (Link and Redial buttons may be replaced by Volume Up and Volume Down).
•
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
Magnetic Reed Hook Switch
•
No moving parts, activates when the handset is removed from or placed in the
telephone cradle.
Tone (DTMF)/Pulse Operation
•
Factory set to operate to tone (DTMF) exchanges unless pulse specified.
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 and Headset
•
The handset cord is attached to the telephone by a connector for ease of
replacement.
•
The cord is designed for industrial applications and is available in 10' (3m), 20' (6m)
coiled and 22" armored lengths. An optional headset is available.
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.
Receiver Volume Control
•
Selected models provide 13.5dB of range.
Overview
Features
S, SO
, and NH
and environments with high humidity.
2
2
3,
Page 3
Installation and Operation
Model EXT-401
Advertisement
Table of Contents
