Emerson Rosemount 2051HT User manual

Quick Start Guide
00825-0100-4591, Rev DB
October2023
Rosemount™ 2051HT Hygienic
Pressure Transmitter
with 4-20 mA HART® Revision 5 and 7

Contents
About this guide...........................................................................................................................3
System readiness......................................................................................................................... 5
Transmitter installation...............................................................................................................7
Product certifications................................................................................................................ 22
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1 About this guide
1.1 Safety messages
This guide provides basic guidelines for the Rosemount 2051
Pressure Transmitter. It does not provide instructions for
configuration, diagnostics, maintenance, service, troubleshooting,
explosionproof, flameproof, or intrinsically safe (IS) installations.
WARNING
Explosions could result in death or serious injury.
Installation of this transmitter in an explosive environment must be
in accordance with the appropriate local, national, and international
standards, codes, and practices. Review the approvals section of the
Quick Start Guide for any restrictions associated with a safe
installation.
Before connecting a handheld communicator in an explosive
atmosphere, be sure that the instruments in the loop 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 transmitter.
WARNING
Process leaks could result in death or serious injury.
Install and tighten process connectors before applying pressure.
Do not attempt to loosen or remove flange bolts while the
transmitter is in service.
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WARNING
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.
Before connecting a handheld communicator in an explosive
atmosphere, be sure that the instruments in the loop 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 transmitter.
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.
WARNING
Replacement equipment or spare parts not approved by Emerson for
use as spare parts could reduce the pressure retaining capabilities of
the transmitter and may render the instrument dangerous.
Use only bolts supplied or sold by Emerson as spare parts.
NOTICE
The products described in this document are NOT designed for
nuclear-qualified applications. Using non-nuclear qualified products
in applications that require nuclear-qualified hardware or products
may cause inaccurate readings. For information on Rosemount
nuclear-qualified products, contact your local Emerson Sales
Representative.
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2 System readiness
Note
Before installing the transmitter, confirm the correct device driver is
loaded on the host systems.
2.1 Confirm HART® Revision capability
If using HART-based control or AMS, confirm the HART capability of
those systems prior to transmitter installation.
Not all systems are capable of communicating with HART Revision 7
protocol. You can configure this transmitter for either HART Revision
5 or 7.
Related information
Switch HART Revision mode
2.2 Confirm correct device driver
•Verify the latest device driver (DD/DTM™) is loaded on your
systems to ensure proper communications.
•Download the latest device driver at Emerson.com or
FieldCommGroup.org.
2.2.1 Device revisions and drivers
Table 2-1 provides the information necessary to ensure you have the
correct device driver and documentation for your device.
Table 2-1: Device Revisions and Files
Identify device Find device driver
Review
instructio
n
Review
functionality
Software
release
date
NAMUR
software
revision(1
)
HART
software
revision(2
)
HART
universal
revision
Device
revision
Reference
manual
Changes to
software
Dec-11 1.0.0 01 7 10
Rosemoun
t 2051
Pressure
Transmitte
r
Reference
Manual
N/A
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Table 2-1: Device Revisions and Files (continued)
Identify device Find device driver
Review
instructio
n
Review
functionality
5 9
(1) NAMUR software revision is located on the hardware tag of the device. In
accordance with NE53, revisions of the least significant level X (of 1.0.X) do not
change functionality or operation of the device and will bot be reflected in this
device revision history.
(2) HART software revision can be read using a HART capable configuration tool.
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3 Transmitter installation
Figure 3-1: Installation Flowchart
3.1 Mount the transmitter
Before mounting, adjust the transmitter to desired orientation.
Transmitter must not be securely mounted or clamped in place when
changing transmitter orientation.
3.1.1 Conduit entry orientation
When installing a Rosemount 2051HT Hygienic Pressure Transmitter,
it is recommended to install so the conduit entry faces downward
toward the ground. This is to maximize drainability when cleaning.
3.1.2 Environmental seal for housing
Thread sealing (PTFE) tape or paste on male threads of conduit
is required to provide a water/dust tight conduit seal and meets
requirements of NEMA® Type 4X, IP66, IP68, and IP69K. Consult
factory if other Ingress Protection ratings are required.
For M20 threads, install conduit plugs to full thread engagement or
until mechanical resistance is met.
Note
IP69K rating only available on units with a SST housing and option
code V9 in the model string.
For aluminum housings ordered with M20 conduit entries,
transmitters shipped will have NPT threads machined into the
housing and a NPT to M20 thread adapter will be provided.
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Considerations for environmental sealing listed above should be
taken into account when installing the thread adapter.
3.1.3 Inline gage transmitter orientation
The low side pressure port (atmospheric reference) on the inline
gage transmitter is located on the neck of the transmitter via a
protected gage vent (See Figure 3-2).
Keep the vent path free from obstructions including but not limited
to paint, dust, and viscous fluids by mounting the transmitter so the
process can drain away. Recommended installations have a conduit
entry facing the ground so the gage vent port is pointing parallel to
the ground.
Figure 3-2: Inline Protected Gage Vent Low Side Pressure Port
Aluminum  Polished 316 SST
A

A. Low side pressure port (atmospheric reference)
3.1.4 Clamping
When installing clamp, follow recommended torque values provided
by gasket manufacturer.
Note
To maintain performance, torquing a 1.5. Tri-Clamp® beyond 50 in-lb
is not recommended on pressure ranges below 20 psi.
3.2 Setting security switch
Prerequisites
Set Simulate and Security switch configuration before installation as
shown in Figure 3-3.
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•The simulate switch enables or disables simulated alerts and
simulated AI Block status and values. The default simulate switch
position is enabled.
•The Security switch allows (unlocked symbol) or prevents (locked
symbol) any configuration of the transmitter.
•Default security is off (unlocked symbol).
•The security switch can be enabled or disabled in software.
Use the following procedures to change the switch configuration:
Procedure
1. If the transmitter is installed, secure the loop, and remove
power.
2. Remove the housing cover opposite the field terminal side.
Do not remove the instrument cover in explosive atmospheres
when the circuit is live.
3. Slide the security and simulate switches into the preferred
position.
4. Reattach transmitter housing cover; it is recommended the
cover be tightened until there is no gap between the cover and
housing to comply with explosion proof requirements.
3.3 Setting simulate switch
The simulate switch is located on the electronics. It is used in
conjunction with the transmitter simulate software to simulate
process variables and/or alerts and alarms. To simulate variables
and/or alerts and alarms, the simulate switch must be moved to
the enable position and the software enabled through the host. To
disable simulation, the switch must be in the disable position or the
software simulate parameter must be disabled through the host.
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Figure 3-3: Transmitter Electronics Board
Aluminum  Polished 316 SST

A
B
A. Simulate switch
B. Security switch
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3.4 Connect the wiring and power up
Use copper wire of sufficient size to ensure the voltage across the
transmitter power terminals does not drop below 9 Vdc. Power
supply voltage can be variable, especially under abnormal conditions
such as when operating on battery backup. A minimum of 12
Vdc under normal operating conditions is recommended. Shielded
twisted pair type A cable is recommended.
Use the following steps to wire the transmitter:
1. To power the transmitter, connect the power leads to the
terminals indicated on the terminal block label.
Note
The Rosemount 2051 power terminals are polarity insensitive,
which means the electrical polarity of the power leads does
not matter when connecting to the power terminals. If
polarity sensitive devices are connected to the segment,
terminal polarity should be followed. When wiring to the screw
terminals, the use of crimped legs is recommended.
2. 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.
No additional power is needed.
Note
The use of a pin or a ferrule wire terminal is not recommended
as the connection may be more susceptible to loosening over
time or under vibration.
3. Ensure proper grounding. It is important 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.
4. If transient protection is needed, refer to section “Signal
ground wiring” for grounding instructions.
5. Plug and seal unused conduit connections.
6. Reattach the transmitter covers.
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Note
It is recommended that the cover be tightened until there is
no gap between the cover and the housing.
The covers must only be capable of being released or removed
with the aid of a tool to comply with applicable ordinary
locations requirements.
Example
Figure 3-4: Wiring
Aluminum Polished 316 SST
DP
A
B
D
E
C

DP
A
B
D
E
C

A. Minimize distance
B. Trim shield and insulate
C. Protective grounding terminal (do not ground cable shield at the
transmitter)
D. Insulate shield
E. Connect shield back to the power supply ground
3.4.1 Grounding for transient terminal block
Ground termination is provided on the outside of the electronics
housing and inside the terminal compartment. These grounds are
used when the transient protection terminal blocks are installed. It is
recommended that 18 AWG or larger wire is used to connect housing
ground to earth ground (internal or external).
If the transmitter is currently not wired for power up and
communication, follow Connect the wiring and power up, step 1–
8. When the transmitter is properly wired, refer to Figure 3-4 for
internal and external transient grounding locations.
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3.4.2 Signal ground wiring
Do not run signal wiring in conduit or open trays with power
wiring, or near heavy electrical equipment. Grounding terminations
are provided on the outside of the electronics housing and inside
the terminal compartment. These grounds are used when transient
protect terminal blocks are installed or to fulfill local regulations.
Procedure
1. Remove the field terminals housing cover.
2. Connect the wiring pair and ground as indicated in Figure 3-4.
a) Trim the cable shield as short as practical and insulate
from touching the transmitter housing.
Note
Do NOT ground the cable shield at the transmitter; if the cable
shield touches the transmitter housing, it can create ground
loops and interfere with communications.
3. Continuously connect the cable shields to the power supply
ground.
a) Connect the cable shields for the entire segment to a
single good earth ground at the power supply.
Note
Improper grounding is the most frequent cause of poor
segment communications.
4. Replace the housing cover. It is recommended that the cover
be tightened until there is no gap between the cover and the
housing.
a) The covers must only be capable of being released or
removed with the aid of a tool to comply with applicable
ordinary locations requirements.
5. Plug and seal unused conduit connections.
Note
The Rosemount 2051HT polished 316 SST housing
only provides ground termination inside the terminal
compartment.
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3.5 Verifying configuration
Verify the configuration using any HART®-capable configuration tool
or local operator interface (LOI) - option code M4. Configuration
instructions for a handheld communicator and LOI are included in
this section.
3.5.1 Verify configuration with a handheld communicator
Prerequisites
Install a Rosemount 2051 device driver (DD) on the handheld
communicator to verify configuration.
Fast Key sequences for the latest DD are shown in Table 3-1. For
Fast Key sequences using legacy DDs, contact your local Emerson
representative.
NOTICE
Emerson recommends installing the latest DD to access the complete
functionality. Visit Emerson.com/FieldCommunicator for information
on updating the DD library.
Procedure
Verify device configuration using the Fast Key sequences in Table 3-1.
A check (✓) indicates the basic configuration parameters. At
minimum, verify these parameters as part of configuration and
startup.
Table 3-1: Device Revision 9 and 10 (HART® 7), DD Revision 1 Fast
Key sequence
Function HART 7 HART 5
✓Alarm and Saturation Levels 2, 2, 2, 5, 7 2, 2, 2, 5, 7
✓Damping 2, 2, 1, 1, 5 2, 2, 1, 1, 5
✓Range Values 2, 2, 2 2, 2, 2
✓Tag 2, 2, 7, 1, 1 2, 2, 7, 1, 1
✓Transfer Function 2, 2, 1, 1, 6 2, 2, 1, 1, 6
✓Units 2, 2, 1, 1, 4 2, 2, 1, 1, 4
 Burst Mode 2, 2, 5, 3 2, 2, 5, 3
 Custom Display Configuration 2, 2, 4 2, 2, 4
 Date 2, 2, 7, 1, 4 2, 2, 7, 1, 3
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Table 3-1: Device Revision 9 and 10 (HART® 7), DD Revision 1 Fast
Key sequence (continued)
Function HART 7 HART 5
 Descriptor 2, 2, 7, 1, 5 2, 2, 7, 1, 4
 Digital to Analog Trim (4–20 mA
output)
3, 4, 2 3, 4, 2
 Disable Configuration Buttons 2, 2, 6, 3 2, 2, 6, 3
 Rerange with Keypad 2, 2, 2, 1 2, 2, 2, 1
 Loop Test 3, 5, 1 3, 5, 1
 Lower Sensor Trim 3, 4, 1, 2 3, 4, 1, 2
 Message 2, 2, 7, 1, 6 2, 2, 7, 1, 5
 Scaled D/A Trim (4–20 mA output) 3, 4, 2 3, 4, 2
 Sensor Temperature/Trend 3, 3, 2 3, 3, 2
 Upper Sensor Trim 3, 4, 1, 1 3, 4, 1, 1
 Digital Zero Trim 3, 4, 1, 3 3, 4, 1, 3
 Password 2, 2, 6, 5 2, 2, 6, 4
 Scaled Variable 3, 2, 2 3, 2, 2
 HART Revision 5 to HART Revision
7 switch
2, 2, 5, 2, 3 2, 2, 5, 2, 3
 Long Tag(1) 2, 2, 7, 1, 2 N/A
 Find Device(1) 3, 4, 5 N/A
 Simulate Digital Signal(1) 3, 4, 5 N/A
(1) Only available in HART Revision 7 mode.
3.5.2 Verify configuration with local operator interface (LOI)
You can use the optional LOI to configure the device.
The LOI is a two-button design with internal and external/rear
buttons. On a polished stainless steel housing, buttons are located
internally both on the display and terminal side of the transmitter.
On an aluminum housing, buttons are located on the display and
externally underneath the top metal tag.
To activate the LOI, push any button. LOI button functionality is
shown on the bottom corners of the display. See Table 3-2 and Figure
3-6 for button operation and menu information.
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Figure 3-5: Internal and external LOI buttons
A B
A. Internal buttons
B. External buttons
Table 3-2: LOI Button operation
Button

Left No SCROLL
Right Yes ENTER
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Figure 3-6: LOI menu
Assign PV
HART Revision
3.5.3 Switch HART® Revision mode
If the HART configuration tool is not capable of communicating with
HART Revision 7, the Rosemount 2051 will load a generic menu
with limited capability. To switch the HART Revision mode from the
generic menu:
Procedure
Navigate to Manual Setup → Device Information → Identification →
Message.
•To change to HART Revision 5, enter HART5 in the Message field.
•To change to HART Revision 7, enter HART7 in the Message field.
3.6 Zero trim the transmitter
Emerson calibrates devices at the factory. Once you have installed
the transmitter, Emerson recommends performing a zero trim on
gauge transmitters to eliminate error due to mounting position or
static pressure effects. You can use either a handheld communicator
or configuration buttons to perform a zero trim.
NOTICE
When performing a zero trim, ensure the equalization valve is open
and all wet legs are filled to the correct level.
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NOTICE
Emerson does not recommend zeroing an absolute transmitter,
Rosemount 2051HT Hygienic Pressure Transmitter.
Procedure
Choose your trim procedure:
•Analog
zero trim
Sets the analog output to 4 mA.
Also referred to as a rerange, it sets the lower range
value (LRV) equal to the measured pressure.
The display and digital HART® output remains
unchanged.
•Digital
zero trim
Recalibrates the sensor zero.
The LRV is unaffected. The pressure value will be zero
(on display and HART output). 4 mA point may not be
at zero.
This requires that the factory calibrated zero pressure
is within a range of three percent of the upper range
value (URV) [0 ± 3% × URV].
Example
URV = 250 inH2O
Applied Zero Pressure = ± 0.03 × 250 inH2O = ± 7.5 inH2O (compared
to factory settings). The transmitter will reject values outside this
range.
3.6.1 Zero trim the transmitter with a handheld communicator
Procedure
1. Connect the handheld communicator.
2. Follow the HART® menu to perform the desired zero trim.
Analog zero (set 4
mA)
Digital zero
Fast Key sequence 3, 4, 2 3, 4, 1, 3
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3.6.2 Zero trim the transmitter with configuration buttons
You can perform a zero trim using one of the three possible sets of
configuration buttons located above the terminal block or under the
top tag.
Procedure
Access the configuration buttons.
•To access the configuration buttons on a polished stainless steel
(SST) housing, remove the terminal side housing cover.
•To access the configuration buttons on an aluminum housing,
loosen the screw on the top tag and slide the tag on top of the
transmitter.
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Figure 3-7: External or rear/terminal side configuration buttons
Local operator
interface (LOI)(1)
Analog zero
and span
Digital zero Aluminum
A
   Polished 316 SST
A
A. Configuration buttons
(1) LOI buttons (option M4) only offer front facing buttons on SST housing
(option 1). You can purchase options D4 and DZ for rear/terminal-side
facing buttons.
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