Panametrics PanaFlow MV80, User Manual, Page: 18 / 184

Chapter 1. Introduction
6 PanaFlow™ MV80, MV82 & MV84 User’s Manual
1.7 Pressure Measurement
PanaFlow Flow Meters incorporate a solid-state pressure transducer isolated by a 316 stainless steel diaphragm. The
transducer itself is micro-machined silicon, fabricated using integrated circuit processing technology. A nine-point
pressure/temperature calibration is performed on every sensor. Digital compensation allows these transducers to
operate within a 0.3% of full scale accuracy band within the entire ambient temperature range of –40°F to 140°F (–40
to 60°C). Thermal isolation of the pressure transducer ensures the same accuracy across the allowable process fluid
temperature range of –330°F to 750°F (–200 to 400°C).
1.8 Flow Meter Configurations
PanaFlow Vortex Mass Flow Meters are available in two model configurations:
• Series MV80 in-line flow meter (replaces a section of the pipeline)
• Series MV82 insertion flow meter (requires a “cold” tap or a “hot” tap into an existing pipeline)
Both the in-line and insertion configurations are similar in that they both use identical electronics and have similar
sensor heads. Besides installation differences, the main difference between an in-line flow meter and an insertion
flow meter is their method of measurement.
For an in-line vortex flow meter, the shedder bar is located across the entire diameter of the flow body. Thus, the
entire pipeline flow is included in the vortex formation and measurement. The sensing head, which directly measures
velocity, temperature and pressure is located just downstream of the shedder bar.
Insertion vortex flow meters have a shedder bar located across the diameter of a short tube. The velocity,
temperature and pressure sensor are located within this tube just downstream of a built-in shedder bar. This entire
assembly is called the insertion sensing head. It fits through any entry port with a 1.875 inch minimum internal
diameter.
The sensing head of an insertion vortex flow meter directly monitors the velocity at a point in the cross-sectional area
of a pipe, duct, or stack (referred to as “channels”). The velocity at a point in the pipe varies as a function of the
Reynolds number. The insertion vortex flow meter computes the Reynolds number and then computes the total flow
rate in the channel. The output signal of insertion meters is the total flow rate in the channel. The accuracy of the total
flow rate computation depends on adherence to the piping installation requirements given in
Chapter 2 . If
adherence to those guidelines cannot be met, contact Panametrics for specific installation advice.
1.8.1 Multivariable Options
The MV80, MV82 or MV84 models are available with the following options:
• V = volumetric flow meter
• VT = velocity and temperature sensors
• VTP = velocity, temperature, and pressure sensors
• VT-EM = energy output options
• VTP-EM = energy options with pressure
• VT-EP = external pressure transmitter input
• VETEP = external RTD temperature input, external 4-20 mA input.