Rosemount™ 405
Compact Primary Element
Quick Start Guide
00825-0100-4810, Rev HB
February 2022
Quick Start Guide February 2022
Safety information
NOTICE
This guide provides basic guidelines for installing the Rosemount 405. It does not provide instructions
for configuration, diagnostics, maintenance, service, troubleshooting, explosion-proof, flameproof, or
intrinsically safe (I.S.) installations. Refer to the Rosemount 405 Reference Manual for more
information.
If the Rosemount 405 was ordered assembled to a Rosemount 3051S Transmitter, the new assembly is
the Rosemount 3051SFC Compact Flow Meter. See Rosemount 3051S Quick Start Guide for
information on configuration and hazardous locations certifications.
If the Rosemount 405 was ordered assembled to a Rosemount 3051S MultiVariable Transmitter, the
new assembly is the Rosemount 3051SFC Compact Flow Meter. See Rosemount 3051SMV Quick Start
Guide for information on configuration and hazardous locations certifications.
To ensure correct operation download the most current version of the Engineering Assistant software
WARNING
Process leaks could result in death or serious injury.
To avoid process leaks, only use the gasket and O-ring designed to seal with the corresponding flange
adapter.
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 to protecting your
system. Restrict physical access by unauthorized personnel to protect end users’ assets. This is true for
all systems used within the facility.
Contents
Primary element location............................................................................................................. 3
Primary element orientation........................................................................................................ 6
Primary element installation.......................................................................................................13
Product certifications................................................................................................................. 16
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February 2022 Quick Start Guide
1 Primary element location
Install the Rosemount 405 in the correct location within the piping branch to
prevent inaccurate measurements caused by flow disturbances.
NOTICE
Consult an Emerson representative if a disturbance is not listed.
Table 1-1: Rosemount 405C straight pipe requirements
Beta 0.40 0.50 0.65
Upstream
(inlet) side of
primary
Downstream (outlet) side of primary 2 2 2
Reducer 2 2 2
Single 90° bend or tee 2 2 2
Two or more 90° bends
in the same plane
Two or more 90° bends
in different planes
Up to 10° of swirl 2 2 2
Butterfly valve (75% to 100%
open)
2 2 2
2 2 2
2 5 5
Table 1-2: Rosemount 405P straight pipe requirements
Beta 0.40 0.50 0.65
Upstream
(inlet) side of
primary
Downstream (outlet) side of primary 6 6 7
Quick Start Guide 3
Reducer 5 8 12
Single 90° bend or tee 16 22 44
Two or more 90° bends
in the same plane
Two or more 90° bends
in different planes
Expander 12 20 28
Ball/gate valve fully open 12 12 18
10 18 44
50 75 60
Quick Start Guide February 2022
Table 1-3: Rosemount 405A straight run requirements
Without straightening
vane
Annubar™ averaging
Upstream
(inlet) side
of primary
Downstream (outlet) side of primary 4 4 4 4
(1) Use straightening vane to reduce the required straight run length.
(2) In plane means the Rosemount 405 is in the same plane as the elbow. Out of plane means
the bar is perpendicular to the plane of the upstream elbow. Refer to Figure 1-1.
pitot tube - sensor size 1
Reducer 12 12 8 4
Expander 18 18 8 4
Single 90° bend or tee 8 10 8 4
Two or more 90° bends
in the same plane
Two or more 90° bends
in different planes
Butterfly Valve (75–100%
open)
Ball/Gate Valve fully open 8 10 8 4
In plane
11 16 8 4
23 28 8 4
30 30 8 4
(2)
Out of
plane
With straightening
vane
From dis-
(2)
turbance
(1)
From
straightening vane
Note
Recommended lengths are represented in pipe diameters. If longer lengths
of straight run are available, position the Rosemount 405 so 80 percent of
the pipe run is upstream and 20 percent is downstream. Flow conditioners
may be used to reduce the required straight run length, improving
performance.
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February 2022 Quick Start Guide
Figure 1-1: Compact Annubar flow meter in plane and out of plane
This figure depicts in plane and out of plane orientations only.
A. In plane
B. Out of plane
1.1 Vibration limits for Rosemount 405 products
Qualified per IEC61298-3 (2008) for field with general application or pipeline
with low vibration level (10–1000 Hz test frequency range, 0.006 in
(0.15 mm) displacement peak amplitude, 20 m/s2 acceleration
amplitude).
The weight and length of the transmitter assembly shall not exceed 9.8 lb
(4.45 kg) and 8.6 in (218 mm).
(1)
(1)
Stainless steel temperature housing is not recommended with primary element
technology A in applications with mechanical vibration.
Quick Start Guide 5
45°
45°
30°
A A
Quick Start Guide February 2022
2 Primary element orientation
The primary element can be installed in any position around the
circumference of the pipe, provided the vents are positioned properly for
bleeding or venting. Optimal results for liquid or steam in a vertical line are
obtained when flow is up.
Liquid - Rosemount 405C, 405P, and 405A
Figure 2-1: Direct mount: horizontal liquid
A. Recommended zone 30°
Figure 2-2: Direct mount: vertical liquid
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February 2022 Quick Start Guide
Figure 2-3: Remote mount: horizontal liquid
Figure 2-4: Remote mount: vertical liquid
Quick Start Guide 7
45°
45°
A
360°
Flow
Quick Start Guide February 2022
Gas - Rosemount 405C, 405P, and 405A
Figure 2-5: Direct mount: horizontal gas
A. Recommended zone 45°
Figure 2-6: Direct mount: vertical gas
A. Recommended zone 90°
Figure 2-7: Remote mount: horizontal gas
8 Emerson.com/Rosemount
FLOW
45°
45°
30°
A A
February 2022 Quick Start Guide
Figure 2-8: Remote mount: vertical gas
Steam - Rosemount 405C, 405P, and 405A
Figure 2-9: Direct mount: horizontal steam
A. Recommended zone 30°
Figure 2-10: Remote mount: horizontal steam
Quick Start Guide 9
Quick Start Guide February 2022
Figure 2-11: Remote mount: vertical steam
Note
For the Rosemount 405A model in steam applications, with DP readings in a
low flow condition as low as 0.75 inH2O in horizontal pipes consider
installing the primary element/flow meter in the top mounting for steam
configuration.
2.1 Top mounting for steam
Top mounting in steam is an alternative mounting method for steam
installations that can be used if there are space restrictions or other
concerns.
This installation method is intended for applications that run with limited
interruptions or shutdowns. Also, for outdoor applications, top mounting
can eliminate the need for heat tracing if steam is flowing.
10 Emerson.com/Rosemount
60° 60°
A
February 2022 Quick Start Guide
Figure 2-12: Direct mount — Rosemount 405C, 405P, and 405A
Horizontal top mounting for steam up to 400 °F (204 °C)
A. Recommended zone 60°
Note
For the Rosemount 405A in wet steam applications, do not mount the flow
meter at the direct vertical position. Mounting at an angle will avoid
measurement inaccuracy due to water running along the bottom of the
pipe.
Figure 2-13: Remote mount up to 850 °F (454 °C) (454 °C) – Rosemount
405C, 405P, and 405A
Note
When top mounting with a remote mount transmitter, use enough impulse
piping to dissipate the process heat to avoid damaging the transmitter.
Suggested top mounting orientations:
Quick Start Guide 11
Quick Start Guide February 2022
• For steam up to 400 °F (204 °C), use direct mount orientation, and for
steam up to 850 °F (454 °C), use remote mount orientation.
• For direct mounting, ambient temperature should be less than 100 °F
(38 °C).
• For remote mount installations, the impulse piping should slope up
slightly from the instrument connections on the Rosemount 405A to the
cross fittings, allowing condensate to drain back into the pipe.
From the cross fittings, the impulse piping should be routed downward to
the transmitter and the drain legs. The transmitter should be located below
the instrument connections of the Rosemount 405A.
For technologies C, P, and A, depending on the environmental conditions, it
may be necessary to insulate the mounting hardware.
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February 2022 Quick Start Guide
3 Primary element installation
Procedure
1. Orient the assembly according to the guidelines provided in Primary
element orientation.
Ensure that the flow arrow stamped on the Rosemount 405 is
pointing in the same direction as the process flow.
Note
ANSI 150 - 600# alignment ring is included as standard when
ordering for up to 8-in line sizes.
• For the 10-in and 12-in line size, you must order the alignment
ring.
• If a DIN or JIS alignment ring is required, order it with the primary
element.
Contact an Emerson sales representative for additional information.
Note
For ease of installation, you can secure the gasket to the flange face
with small pieces of tape. Be sure the gasket or tape does not
protrude into the pipe.
2. If using an alignment ring with through holes, proceed to Step 7.
3. Insert two studs through the flange holes located opposite the head
of the Rosemount 405.
4. Place the alignment ring on the Rosemount 405 body.
See Figure 3-1.
5. Insert gaskets.
6. Insert the Rosemount 405 between the flanges so the indentations
on the alignment ring contact the installed studs.
The studs must contact the alignment ring in the indentation marked
with the appropriate flange rating to ensure proper alignment.
7. Place the alignment ring on the Rosemount 405 body.
See Figure 3-1.
8. Insert the Rosemount 405 between the flanges.
a) Starting on the side opposite the Rosemount 405 head,
rotate the alignment ring such that the radius corresponding
to the alignment ring marking matches that of the
application flange rating.
Quick Start Guide 13
Quick Start Guide February 2022
b) Insert one stud through both the upstream and downstream
flanges and allow the ring to rest on the bolt. This will ensure
proper alignment.
9. Repeat Step 8 for the installation of the remaining bolts that will
contact the alignment ring.
10. Insert gaskets.
11. Install remaining studs and nuts (hand tight). Ensure three of the
studs are in contact with the alignment ring.
12. Lubricate studs and tighten nuts in a cross pattern to the appropriate
torque per local standards.
Note
We recommend using standard 1/16-in gaskets with the Rosemount
405. Using other gaskets could potentially cause a bias shift in the
measurement.
3.1 Recommended insulation guidelines
For flow meters with integral temperature assembly, it is recommended that
the meter be insulated when the difference between process and ambient
temperature is greater than 30 °F (16.6 °C).
• For line sizes ½-in (15 mm) to 4-in (100 mm), we recommend having 4-in
(100 m) of insulation of at least a 4.35 R-factor.
• For line sizes 6-in (150 mm) to 12-in (300 mm), we recommend having
5-in (125 mm) of insulation of at least a 4.35 R-factor.
The full thickness stated above may not be necessary for the entire flow
meter, but is required for the temperature sensor area at a minimum.
Insulation is needed to ensure meeting our specified temperature
measurement accuracy. Only place insulation up to the neck; do not cover
the transmitter.
14 Emerson.com/Rosemount
A
B
G
A
F
C
D
B
E
February 2022 Quick Start Guide
Figure 3-1: Rosemount 405 installation
A. Rosemount 405
(2)
B. Alignment ring
C. Existing pipe assembly with flange
D. Nut
E. Gasket
(3)
F. Stud
G. Transmitter
(2) This installation drawing applies to the Rosemount 405C, 405P, and 405A.
(3) The installation drawing applies when using the Rosemount 3051S, Rosemount
3051S MultiVariable, Rosemount 3051, and Rosemount 2051 transmitters. See the
following documents for quick installation instructions for the transmitter:
Rosemount 3051S and 3051SF Flow Meter MultiVariable™ Transmitters, Rosemount
3051S Pressure Transmitter and Rosemount 3051SF Flow Meter with HART
Protocol, Rosemount 3051 Pressure Transmitter and 3051CF Flow Meter with 4-20
mA HART and 1-5 Vdc Low Power Protocol, or Rosemount 2051 Pressure Transmitter
with PROFIBUS® PA Protocol.
Quick Start Guide 15
®
Quick Start Guide February 2022
4 Product certifications
4.1 Approved manufacturing locations
Rosemount, Inc.: Shakopee, Minnesota USA
Rosemount DP Flow Design and Operations: Boulder, Colorado USA
Emerson Process Management GmbH & Co. OHG: Wessling, Germany
Emerson Asia Pacific Private Limited: Singapore
Emerson Beijing Instrument Co., Ltd: Beijing, China
4.2 European Directive information
The EU Declaration of Conformity for all applicable European directives for
this product can be found on the website at Rosemount Primary Elements
Declaration of Conformity.
Contact your local sales office to obtain a hard copy.
European Pressure Equipment Directive (PED) (97/23/EC)
Rosemount 405 Compact Primary Element — Sound Engineering Practice
(SEP)
Pressure Transmitter — See appropriate Pressure Transmitter QSG.
4.3 Hazardous locations certifications
For information regarding the electronics product certification, see the
appropriate transmitter Quick Start Guide:
• Rosemount 3051SMV: Rosemount 3051S and 3051SF Series Flow Meter
MultiVariable™ Transmitters Quick Start Guide
• Rosemount 3051S: Rosemount 3051S Series Pressure Transmitter and
Rosemount 3051SF Series Flow Meter with HART® Protocol Quick Start
Guide
• Rosemount 3051: Rosemount 3051 Pressure Transmitter and 3051CF
Series Flow Meter with 4-20 mA HART and 1-5 Vdc Low Power Protocol
Quick Start Guide
• Rosemount 2051: Rosemount 2051 Differential Flow Transmitter
Product Detail Page
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February 2022 Quick Start Guide
Figure 4-1: Rosemount Primary Elements Declaration of Conformity
Quick Start Guide 17
Quick Start Guide February 2022
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February 2022 Quick Start Guide
Quick Start Guide 19
Quick Start Guide February 2022
20 Emerson.com/Rosemount
February 2022 Quick Start Guide
4.4 China RoHS
Quick Start Guide 21
Quick Start Guide February 2022
22 Emerson.com/Rosemount
February 2022 Quick Start Guide
Quick Start Guide 23
*00825-0100-4810*
00825-0100-4810, Rev. HB
Quick Start Guide
February 2022
For more information:
©
2022 Emerson. All rights reserved.
Emerson Terms and Conditions of Sale are
available upon request. The Emerson logo
is a trademark and service mark of
Emerson Electric Co. Rosemount is a mark
of one of the Emerson family of
companies. All other marks are the
property of their respective owners.
Emerson.com
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