Emerson Rosemount 3051HT Manuale utente
Quick Start Guide
00825-0100-4091, Rev DC
July2023
Rosemount™ 3051HT Hygienic
Pressure Transmitter
with 4–20 mA HART®
Contents
About this guide...........................................................................................................................3
Transmitter installation...............................................................................................................5
Product certifications................................................................................................................ 19
Quick Start Guide July2023
2 Emerson.com/Rosemount
1 About this guide
This guide provides basic guidelines for Rosemount 3051HT
Hygienic Pressure Transmitter. It does not provide instructions for
configuration, diagnostics, maintenance, service, troubleshooting,
explosion-proof, flameproof, or Intrinsically Safe (IS) installations.
Refer to the Rosemount 3051 Pressure Transmitter Manual for more
instructions. This guide and the referenced manual are also available
on Emerson.com.
1.1 Safety messages
WARNING
Explosions
Explosions could result in death or serious injury.
Installation of device in an explosive environment must be in
accordance with appropriate local, national, and international
standards, codes, and practices. Review Product certifications for
any restrictions associated with a safe installation.
Before connecting a handheld communicator in an explosive
atmosphere, ensure that the instruments are installed in
accordance with intrinsically safe or non-incendive field wiring
practices.
In an explosion-proof/flameproof installation, do not remove the
transmitter covers when power is applied to the unit.
WARNING
Process leaks
Process leaks may cause harm or result in death.
To avoid process leaks, only use the O-ring designed to seal with
the corresponding flange adapter.
WARNING
Electrical shock
Electrical shock can result in death or serious injury.
Avoid contact with the leads and terminals. High voltage that may
be present on leads can cause electrical shock.
July2023 Quick Start Guide
Quick Start Guide 3
WARNING
Physical access
Unauthorized personnel may potentially cause significant damage to
and/or misconfiguration of end users’ equipment. This could be
intentional or unintentional and needs to be protected against.
Physical security is an important part of any security program and
fundamental in protecting your system. Restrict physical access by
unauthorized personnel to protect end users’ assets. This is true for
all systems used within the facility.
NOTICE
Conduit/cable entries
Unless otherwise marked, the conduit/cable entries in the housing
enclosure use a ½–14 NPT form. Only use plugs, adapters, glands, or
conduit with a compatible thread form when closing these entries.
Entries marked “M20” are M20 × 1.5 thread form. On devices with
multiple conduit entries, all entries will have the same thread form.
When installing in a hazardous location, use only appropriately listed
or Ex certified plugs, glands, or adapters in cable/conduit entries.
Quick Start Guide July2023
4 Emerson.com/Rosemount
2 Transmitter installation
2.1 Mount the transmitter
Before mounting, place the Rosemount 3051HT Hygienic Pressure
Transmitter to the desired orientation. When changing the
transmitter orientation, do not have the transmitter securely
mounted or clamped in place.
Conduit entry orientation
When installing a Rosemount 3051HT, Emerson recommends
installing it so that a conduit entry faces downward or parallel to the
ground. This is to maximize drainability when cleaning.
Environmental seal for housing
Thread sealing (PTFE) tape or paste on male threads of conduit is
required to provide a watertight/dustproof conduit seal and meet
requirements of NEMA® Type 4X, IP66, IP68, and IP69K. If other
Ingress Protection ratings are required, then consult the factory .
Note
IP69K rating only available on units with a Stainless Steel (SST)
housing and option code V9 in the model string.
For M20 threads, install conduit plugs to full thread engagement or
until mechanical resistance is met.
Inline gauge transmitter orientation
The low side pressure port (atmospheric reference) on the inline
gauge transmitter is located on the neck of the transmitter via a
protected gauge vent (See Figure 2-1).
Mount the transmitter so that the process can drain away. This will
keep the vent path free from obstructions including, but not limited
to, paint, dust, and viscous fluids.
July2023 Quick Start Guide
Quick Start Guide 5
Figure 2-1: Inline protected gauge vent low side pressure port
Aluminum Polished 316 SST
A. Low side pressure port (atmospheric reference)
Clamping
When installing a clamp, follow the recommended torque values
provided by the gasket manufacturer.
Note
To maintain performance, Emerson does not recommend torquing a
1.5" Tri-Clamp beyond 50 in-lb. on pressure ranges below 20 psi.
2.2 Set the switches
Before installation, set alarm and security switch configuration as
shown in Figure 2-2 and Figure 2-3.
•The alarm switch sets the analog output alarm to high or low.
Default alarm is high.
•The security switch allows ( ) or prevents ( ) any configuration of
the transmitter. Default security is off ( ).
To change the switch configuration:
Procedure
1. If the transmitter is installed, then secure the loop.
2. Remove power.
3. Remove the housing cover opposite the field terminal side.
Quick Start Guide July2023
6 Emerson.com/Rosemount
WARNING
When the circuit is live in explosive atmospheres, do not
remove the instrument cover.
4. Using a small screwdriver, slide the security and alarm
switches into the preferred position.
5. Reattach the transmitter cover.
Note
To comply with:
Applicable ordinary location requirements, the covers must
only be capable of being released or removed with the aid of a
tool.
Explosion-proof requirements, the cover must be fully
engaged.
Figure 2-2: Transmitter electronics board - aluminum
Without LCD display With Local Operator Interface
(LOI) or LCD display
A. Alarm
B. Security
July2023 Quick Start Guide
Quick Start Guide 7
Figure 2-3: Transmitter electronics board - polished 316
Stainless Steel (SST)
Without LCD display With LOI or LCD display
A. Alarm
B. Security
2.3 Connect the wiring and power up
Figure 2-4: Transmitter wiring diagrams (4–20 mA) - aluminum
DP
A
B
D
E
C
A. Minimize distance
B. Trim shield and insulate
C. Protective grounding terminal
D. Insulate shield
E. Connect shield back to the power supply ground
Quick Start Guide July2023
8 Emerson.com/Rosemount
Figure 2-5: Transmitter wiring diagrams (4–20 mA) - polished 316
Stainless Steel (SST)
DP
A
B
D
E
C
A. Minimize distance
B. Trim shield and insulate
C. Protective grounding terminal
D. Insulate shield
E. Connect shield back to the power supply ground
Note
Use shielded twisted pair cables for best results.
Use 24 AWG or larger wire that does not exceed 5,000 ft. (1,500 m) in
length.
If applicable, install wiring with a drip loop. Arrange the drip loop so
the bottom is lower than the conduit connections and the transmitter
housing.
NOTICE
•Installation of the transient protection terminal block does not
provide transient protection unless the Rosemount 3051HT
Hygienic Pressure Transmitter case is properly grounded.
•Do not run signal wiring in conduit or open trays with power
wiring, or near heavy electrical equipment.
•Do not connect the powered signal wiring to the test terminals.
Power could damage the test diode in the terminal block.
July2023 Quick Start Guide
Quick Start Guide 9
Procedure
1. Remove the housing cover on the FIELD TERMINALS side.
2. Connect the positive lead to the “+” terminal (PWR/COMM) and
the negative lead to the “–” terminal.
3. Ensure full contact with terminal block screw and washer.
When using a direct wiring method, wrap wire clockwise to
ensure it is in place when tightening the terminal block screw.
NOTICE
Emerson does not recommend using a pin or a ferrule wire
terminal, as the connection may be more susceptible to
loosening over time or under vibration.
4. Ground housing to fulfill local grounding regulations.
Ensure proper grounding. It is important that the instrument
cable shield be:
•Trimmed close and insulated from touching the transmitter
housing.
•Connected to the next shield if cable is routed through a
junction box.
•Connected to a good earth ground at the power supply
end.
Note
If transient protection is needed, then refer to Grounding for
transient terminal block for grounding instructions.
5. Plug and seal unused conduit connections.
6. Reattach the transmitter covers.
Note
To comply with applicable ordinary locations requirements, the
covers must only be capable of being released or removed with the
aid of a tool.
To comply with explosion-proof requirements, the cover must be fully
engaged.
Quick Start Guide July2023
10 Emerson.com/Rosemount
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