Individual Barrier Configuration: For applications requiring just a few phones, we recommend that the Intrinsically-Safe Telephones be purchased on an ?individual? basis. Each phone (Model 262-001 or 272-001) should be ordered with its own wall-mountable Isolation Barrier Unit (Model 263-000). The Isolation Barrier Unit houses both the PCBA and the Power Supply for the telephone. For convenience, a single model number has been established to order an indoor (Model 261-001) or weatherproof (Model 271-001) combination of these units.
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