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
2 Emerson.com/Rosemount
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.
4 Emerson.com/Rosemount
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
6 Emerson.com/Rosemount
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
Loading...