Process flow plate with temperature measurement feature

Details Process flow plate with temperature measurement feature Process flow plate with temperature measurement feature

1999-09-13

2003-04-08

Patel, Harshad (Department: 2855)

Measuring and testing

Volume or rate of flow

Using differential pressure

C073S861610

Reexamination Certificate

active

06543297

ABSTRACT:

BACKGROUND OF THE INVENTION
The invention relates to the fluid process measurement and control industry. The process measurement and control industry employs process variable transmitters to remotely monitor process variables associated with fluids such as slurries, liquids, vapors, gasses, chemicals, pulp, petroleum, pharmaceuticals, food and other food processing plants. Process variables include pressure, temperature, flow, level, turbidity, density, concentration, chemical composition and other properties.
FIG. 1
illustrates a process flow device
50
for measuring process variables, such as pressure and flow. Device
50
includes a flow plate
52
clamped between pipe flanges
54
,
56
and a remote temperature sensor
60
. Mass flow rate for fluid flow is a function of:
Q=KaYF
a
{square root over (2g
c
(&Dgr;p)(&rgr;))}
where:
Q—is the mass flow rate;
&rgr;—is the density of the fluid;
&Dgr;p—is the differential pressure across a flow constriction;
a—is the cross sectional area of the orifice;
Y—is a gas expansion factor;
F
a
—is the area factor for thermal expansion of the orifice;
g
c
—is a unit conversion factor; and
K—is a flow coefficient.
Density &rgr; of the fluid is a function of the temperature and pressure of the fluid. For compressible fluids, such as gases, pressure has a relatively large impact upon fluid density (&rgr;). Temperature variations influence mass flow rate calculation since mass flow rate is a function of the density &rgr; as well as the profile and dimension of the flow constriction. The profile and dimensions of the flow constriction change with temperature variations due to thermal expansion. In particular, fluid density is a function of at least temperature and metal orifice plates expand and contract with temperature changes.
In prior flow plate applications, temperature was measured remote from the flow plate
52
. The remote temperature measurement was used to estimate the temperature proximate the flow constriction. The remote temperature measurement required separate pipe connections creating increased maintenance and installation complexity. Such added complexity increased field installation time due to increased assembly and testing time. Additionally, each sealed interface provides a potential location for the development of leaks due to the significant static pressure generally present within the pipe. Such leaks, also known as fugitive emissions are undesirable.
SUMMARY
A temperature sensing channel is disposed proximate a flow plate to provide reduced field installation time, cost, and complexity while potentially increasing device accuracy and longevity. Embodiments of the invention relate to a flow plate and a temperature sensor disposed proximate the flow plate in a sensing channel.


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Model 1195 Integral Orifice Assembly, Rosemount Catalog pp. Flow-125—Flow 137 (Published 1995).
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U.S. patent appliction Ser. No. 09/394,728, Kleven, filed Sep. 13, 1999.

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