Rosemount 8712, Reference Manual

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Reference Manual
00809-0100-4664, Rev BA
January 2010
Rosemount 8712
2-4
Environmental
Considerations
To ensure maximum transmitter life, avoid excessive heat and vibration.
Typical problem areas:
• high-vibration lines with integrally mounted transmitters
• warm-climate installations in direct sunlight
• outdoor installations in cold climates.
Remote-mounted transmitters may be installed in the control room to protect
the electronics from the harsh environment and provides easy access for
configuration or service.
Rosemount 8712 transmitters require external power and there must be
access to a suitable power source.
INSTALLATION
PROCEDURES
Rosemount 8712 installation includes both detailed mechanical and electrical
installation procedures.
Mount the Transmitter
At a remote site the transmitter may be mounted on a pipe up to two inches in
diameter or against a flat surface.
Pipe Mounting
To mount the transmitter on a pipe:
1. Attach the mounting plate to the pipe using the mounting hardware.
2. Attach the 8712 to the mounting plate using the mounting screws.
Surface Mounting
To surface mount the transmitter:
1. Attach the 8712 to the mounting location using the mounting screws.
Identify Options and
Configurations
The standard application of the 8712 includes a 4–20 mA output and control
of the sensor coils. Other applications may require one or more of the
following configurations or options:
• Multidrop Communications
• PZR (Positive Zero Return)
• Auxiliary Output
• Pulse Output
Additional options may apply. Be sure to identify those options and
configurations that apply to your situation, and keep a list of them nearby for
consideration during the installation and configuration procedures.
Hardware Switches
The 8712 electronics board is equipped with
three user-selectable hardware switches. These switches set the Failure
Alarm Mode, Internal/External Analog Power, and Transmitter Security. The
standard configuration for these switches when shipped from the factory are
as follows:
Failure Alarm Mode: HIGH
Internal/External Analog Power: INTERNAL
Transmitter Security: OFF