Installation of this instrument
Azbil Corporation
2-2
Model: MVC10A/10F - Multivariable Air Flow Meter
2-1:
Before starting installation
Criteria for selecting the place for installation
Introduction
To maximize the performance of this instrument, choose the optimum installation
location to satisfy the following selection criteria:
Precautions in the environment
• Install this instrument at a place where the ambient temperature is in the range
from -15 to +50°C and ambient relative humidity 5 to 95%.
• Avoid a place close to a large-current cable, motor, transformers, or power supply
sources that may give rise to induction interference and/or acoustic noise, which
may cause instrument failure or errors in output values.
• Avoid a place where there are severe vibrations (permissible piping vibration:
5 m/s
2
maximum) or a highly corrosive atmosphere, which may cause failure of
equipment.
• Also avoid whenever possible subjecting the instrument to direct sunlight, which
may cause output errors.
Piping vibration
Use this instrument under the following conditions: Amplitude: 1.5 mm minimum for
a frequency 0 to 9 Hz; Acceleration 1.5 m/s
2
minimum for 9 to 60 Hz.
Influence of straight pipe section lengths
Determine the length of a straight pipe section by referring to the following table.
It is the minimum length of a straight pipe section required for the connection
between this instrument and each joint of the upstream and downstream sides of the
instrument. Each number in the table denotes a multiple of the pipe diameter.
D
L1
L2
L1
L1
L1
L1
L1
L2
L2
L2
L2
L2
3.5D
0.5
1.5
2.5
1.5
2.5
0.6
4.0
Multivariable mass
flow meter
Multivariable mass
flow meter
Multivariable mass
flow meter
Multivariable mass
flow meter
Multivariable mass
flow meter
Multivariable mass
flow meter
All the
joints
shown to
the left
Downstream
side L
2
One 90
o
bend
Two or more 90
o
bends on a
single plane
Two or more 90
o
bends not lying
on a single plane
Reducer
Expansion pipe
Sluice valve
(fully open)
Upstream side L
1
When a flow control valve is installed on the upstream side, provide a distance of
10 D or more from this instrument.
Note 1:
Set the value of curvature radius against a valve to that of the bore diameter or more of
the duct line.
Note 2:
The straight pipe lengths on the upstream and downstream sides are the distances
measured from the upstream and downstream flanges, respectively, of the flow meter.
Fig. 2-1
Straight pipe section on the upstream side of the flow meter
(D: Nominal bore diameter of detector)
Selecting the pipe-fitting direction
Fit the pipe in horizontal or vertical piping.
Flow direction
This instrument has an oval orifice in the pipe, and the service direction is specified. Allow
the work fluid to flow in the direction of the arrow marked on the side of the detector.
Summary of Contents for MVC10A
Page 1: ...The Multivariable Air Flow Meter Model MVC10A 10F User s Manual CM2 MVC200 2001 ...
Page 10: ...Table of Contents ...
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