Siemens ET 77E Series Spécifications télécharger pdf (Page 28)

SD77

2.8.1 Intrinsically Safe Models

A Model 77F transducer is considered intrinsically safe only when it has a nameplate with the FM logo and the

words INTRINSICALLY SAFE.

Install the transducer in strict compliance with the instructions furnished by the barrier manufacturer and in

accordance with drawing 15032-7704 (FM and CSA), drawing 15032-7705 (FM only), or ATEX Requirements.

See Section 1.3 Product Certifications for additional information.

1. Install a Model 77F transducer in the hazardous area as detailed by this section of this instruction.

2. Install the required energy limiting barriers in the non-hazardous area. Refer to the barrier manufacturer's

instructions and to the appropriate connection diagram in this instruction.

3. Install the required wiring between the Model 77F transducer and the barriers. Use shielded or unshielded

multi-pair or single-pair cables. Ground the transducer body as required.

4. In a similar manner, install the required wiring between the barriers and the output terminals of device driving

the transducer (i.e. providing the input signal).

5. Install the redundant ground system for the barrier installation as specified by the barrier manufacturer.

6. Check all signal and ground connections.

7. Check all pneumatic connections and transducer adjustments.

8. Check the calibration of the transducer as outlined in the Section 4 Calibration.

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Siemens ET 77E Series Spécifications Page 28