Solartron Mobrey 7828, Technical Manual

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7828 Density Transmitter Technical Manual Mechanical Installation
78285000_AB
2-7
2.3 STANDARD INSTALLATIONS
To overcome the need for in-situ calibration for every installation, three 'standard'
installations are proposed. If an installation conforms to one of these standards, the
factory calibration of the 7828 is valid, and in-situ calibration unnecessary. The three
installations are summarised below.
Standard
installation
Free stream T-piece
(2in or 3in dia.,
pipe or weldolet)
Flow-through chamber
Description 7828 tines project
directly into the main
fluid flow 7828 tines are
contained in a side
pocket off the main
flow, recessed by
25.4mm (1in.). 7828 tines are contained
in a flow-through chamber
in which fluid is circulated
from the main flow
Flow rate 0.3 to 0.5 m/s
(0.98 to 1.6 ft/s)
at the 7828
0.5 to 3 m/s
(1.6 to 9.8 ft/s)
at main pipe wall
10 to 30 l./min
(2.6 to 8 US gal./min)
Viscosity
limits Up to 20 000cP Up to 100cP
(250cP in some cases) Up to 20 000cP
Temperature -50 to 200°C
(-58 to 392°F) -50 to 200°C
(-58 to 392°F) -50 to 200°C
(-58 to 392°F)
Main flow
pipe size 100mm (4") horizontal
150mm (6") vertical, or
larger 50mm (2") or larger Any
Advantages
•
=
simple installation in
large bore pipes
•
=
ideal for clean fluids
and non-waxing oils
=
•
=
simple installation in
large bore pipes
•
=
ideal for clean fluids
and non-waxing oils
=
•
=
adaptable installation to
any diameter main pipe
and for tank applications
•
=
ideal for flow and
temperature
conditioning
•
=
fast response
Drawbacks Not suitable:
•
=
for low or unstable
flow rates
•
=
for small bore pipes
Not suitable:
•
=
for dirty fluids or
slurries
•
=
for low or unstable
flow rates
•
=
where step changes
in viscosity can occur
•
=
for small bore pipes
•
=
where temperature
effects are significant
•
=
careful system design
required to ensure
representative
measurement
•
=
frequently requires the
use of a pump
For tank installations, always consult Solartron.