GAI-Tronics 262-001 Intrinsically-Safe Telephones - Manual (Page 5)

Pub. 42004-173G
Model 262-001 and 272-001 Intrinsically-Safe Telephones Page 5 of 12
f:\standard ioms - current release\42004 instr. manuals\42004-173g.doc
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External Ringers
The Model 262-001 and 272-001 Intrinsically-Safe Telephones are designed with loud broadcast ringers.
In some instances, however, it is advantageous to install external ringers on these units. Examples of such
situations include areas where the noise level exceeds 95 dB, and locations where a large area must be
covered by a single telephone.
To install an external ringer with the Model 262-001 and 272-001 Telephones, it is necessary to attach an
explosion-proof relay to the telephone line. The relay must not interfere with the direct connection
between the Model 263-000 IBU and the intrinsically-safe telephone. The relay must also be wired to an
explosion-proof ringer purchased separately by the customer. The customer must install sealed conduit
from the relay to the ringer. Refer to Figure 2. Contact your local electrical distributor for information on
relays and explosion-proof ringers.
Figure 2. Placement of Explosion-proof Ringer in the Hazardous Area
Operation
1. Lift the I.S. telephone handset to place a call.
2. Adjust handset receiver volume control, if necessary, by pressing the handset pressbar.
N OTE : Pressing the handset pressbar increases the volume in increments of 4 dB. The volume starts
at 0 dB and increases to a maximum volume of 8 dB. Pressing the pressbar a fourth time will return
the volume to -4 dB. Pressing the pressbar one more time will return the gain to 0 dB.
3. Dial the desired number.
4. After completion of the call, place the handset on-hook.