272-001
Pub. DS272-001
GAI-TRONICS® CORPORATION
A HUB BEL L C OMP ANY
Model 272-001
Intrinsically-Safe Telephone
General Information
This data sheet applies to the GAI-Tronics Model 272-001 Outdoor Intrinsically-Safe (I.S.) Telephone,
which is designed to be installed in hazardous areas. The Model 263 Isolation Barrier Units (IBU) or
rack-mount card unit is placed in a non-hazardous area up to one mile from the telephone. This limits the
energy levels going to the hazardous area.
For convenience, an I.S. telephone and the IBU can be purchased together under a single model
number— Model 271-001 for outdoors.
This telephone is constructed of durable glass-reinforced polyester, which is highly resistant to chemicals
and weather. In order to be intrinsically safe, energy and energy storage must be constrained to “safe”
levels in hazardous area apparatus. Wiring inherently has capacitance formed by a dielectric material
between two conductors. A buildup of this capacitance can form a surge of electricity, a dangerous
situation in a hazardous area.
Intrinsically-safe telephones require cabling that will limit the amount of capacitance formed. The
limitation on cable length was set by Underwriter’s Laboratory (UL) based on test results. This “worst
case” cable available was found to have a capacitance of 60 picofarads/foot. Therefore, UL set the cable
limitation at one mile, the length at which this worst-case cable capacitance level was still within
acceptable bounds. Cable types with less capacitance have been specified to allow connection distances
over one mile. For example: GAI-Tronics Model 60059-001 and 60021-301 cables allow connection
distances of up to 1.5 miles.
Where multiple intrinsically-safe telephone wires are routed together, shielded cable should be used. The
use of shielded cable prevents cross-talk from occurring between multiple intrinsically-safe telephone
circuits. The shield must be grounded to an intrinsically-safe ground and connected only at the IBU.
Specifications
Location (Model 263 IBU) ......................................................... Ordinary (non-classified) indoor/outdoor
FCC Registration Number .................................................................................... ADGUSA-65066-TE-E
Ringer Equivalence Number (REN)................................................................................................... 0.4B
IC Certification Number (Canada) .......................................................................................... 822 4541 A
Load number (LN) (Canada)................................................................................................................. 14
Connecting method (Canada)........................................................................................................ CA11A
Operating temperature range............................................................. -40° F to +140° F (-40° C to +60° C)
Relative humidity .................................................................................. 95% (non-condensing) maximum
GAI-Tronics Corporation P.O. Box 1060, Reading, PA 19607-1060 USA
610-777-1374 „ 800-492-1212 „ Fax: 610-796-5954
VISIT WWW .GAI-TRONICS.COM FOR PRODUCT LITERATURE AND MANUALS
Model 272-001 Intrinsically-Safe Telephone
Pub. DS272-001
Page: 2 of 2
Maximum safe wiring distance between IBU and I.S. telephone
Standard wire types ......................................................................................................................... 1 mile
Using GTC 60059-001 conductor ................................................................................................ 1.5 miles
Using GTC 60021-301 conductor ................................................................................................ 1.5 miles
Wiring
Construction...........................................................................................................................Twisted pair
*Type...........................................................................................................................................Shielded
Conductor size (minimum) ....................................................................................................No. 24 AWG
Wiring loop resistance (maximum) ............................................................................................. 275 ohms
Wiring capacitance (maximum) ................................................................................................... 0.316 uF
*Shielded cable is required where multiple I.S. telephone wires are routed together.
Electrical /Acoustical
Electrical specifications (nominal) ........................................................................................ 12 V, 12 mA
Ringer performance (typical) ........................................................................................... 98 dB @ 10 feet
Frequency (adjustable at the IBU) ..................................................................... 1–8 kHz (typical)
Ring signal loss (No. 18 AWG).................................................................................... -4 dB/mile
Signaling....................................................................................................................................... DTMF
Transmission path (2-conductor) ............................................................................................. Full duplex
Microphone....................................................................................................... Dynamic noise-canceling
Earpiece .................................................................................................... Hearing aid compatible (HAC)
Output (0 dBm @ IBU TELCO Line) ......................................................... 105 dB SPL @ 1 kHz
Audio signal loss (No. 18 AWG)............................................................................... -1.3 dB/mile
NOTE: Must be connected in accordance with GAI-Tronics drawing 73242 (Pub. 42004-380).
Mechanical
Housing construction.........................................................................................Glass-reinforced polyester
Housing dimensions ................................ 9.39 W × 13.16 H × 7.46 D inches; (238.5 × 334.3 × 189.5 mm)
Enclosure rating (UL)................................................................................................. Type 3R (rainproof)
Weight .......................................................................................................................... 10.0 lbs. (4.53 kg)
Approvals
When connected according to GAI-Tronics drawing 73242 (Pub. 42004-380):
UL/cUL......................................................................................... Class I, Div. 1, Groups A, B, C, and D;
Class II, Div. I, Groups E, F, and G; Class III
\\s_eng\gtcproddocs\standard ioms - current release\data sheets\ds272-001.doc
03/06
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