Emerson 644 Specifications Page 11

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Reference Manual
00809-0200-4728, Rev RA
Section 1: Introduction
April 2015
1
Introduction
Section 1 Introduction
1.1 Safety messages
Instructions and procedures in this section may require special precautions to ensure the safety
of the personnel performing the operations. Information that potentially raises safety issues is
indicated by a warning symbol ( ). Refer to the following safety messages before performing
an operation preceded by this symbol.
1.1.1 Warnings
Failure to follow these installation guidelines could result in death or
serious injury.
Make sure only qualified personnel perform the installation.
Explosions could result in death or serious injury.
Do not remove the connection head cover in explosive atmospheres when the
circuit is live.
Before connecting HART
®
in an explosive atmosphere, make sure the instruments in
the loop are installed in accordance with intrinsically safe or non-incendive field wiring
practices.
Verify the operating atmosphere of the transmitter is consistent with the appropriate
hazardous locations certifications.
All connection head covers must be fully engaged to meet explosion-proof
requirements.
Process leaks could result in death or serious injury.
Do not remove the thermowell while in operation.
Install and tighten thermowells and sensors before applying pressure.
Electrical shock could cause death or serious injury.
Use extreme caution when making contact with the leads and terminals.
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