
36
Reference Manual
00809-0100-4808, Rev DA
Installation
October 2016
Installation
3.5.3
Grounding the transmitter case
The transmitter case should always be grounded in accordance with national and local electrical codes.
The most effective transmitter case grounding method is direct connection to earth ground with
minimal impedance. Methods for grounding the transmitter case include:
Internal Ground Connection: The Internal ground connection screw is inside the
FIELD TERMINALS
side
of the electronics housing. This screw is identified by a ground symbol (
), and is standard on all
Rosemount 3051N Transmitters.
External Ground Assembly: This assembly is included as standard with the transient protection
terminal block (T1) included with the Rosemount 3051N.
Note
Grounding the transmitter case using the threaded conduit connection may not provide a sufficient
ground. The standard transient protection terminal block (T1) does not provide transient protection
unless the transmitter case is properly grounded. Use the above guidelines to ground the transmitter
case. Do not run the transient protection ground wire with signal wiring as the ground wire may carry
excessive current if a lightning strike occurs.
3.6
Environmental considerations
The following guidelines can help optimize transmitter performance. Mount the transmitter to minimize
ambient temperature changes, vibration, mechanical shock, and to avoid external contact with corrosive
materials.
“Temperature limits” on page 43
lists transmitter temperature operating limits.
3.6.1
Access requirements
When choosing an installation location and position, take into account the need for access to the
transmitter.
Process flange orientation
Mount the process flanges with sufficient clearance for process connections. For safety reasons, place
the drain/vent valves so the process fluid is directed away from technicians when the vents are used. In
addition, consider the possible need for a testing or calibration input.
Housing rotation
See
“Housing rotation” on page 34
.
Terminal side of electronics housing
Mount the transmitter so the terminal side is accessible. A 0.75-inch (19 mm) clearance is required for
cover removal. Use a conduit plug on the unused side of the conduit opening.
Circuit side of electronics housing
Provide 0.75 inches (19 mm) clearance for cover removal. Three inches of clearance are required for
cover removal if a meter is installed.
Exterior of electronics housing
The integral span and zero adjustments are located under the label plate on the top of the transmitter.
Allow a minimum of 1.0 inch of clearance above the transmitter if intending to use the integral zero and
span adjustments.
Содержание Rosemount 3051N
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