|| Flow Meter Types
to traditional vortex flow meters, which measure
only volumetric flow rate, Multi-parameter Mass
Vortex measures five process variables with one
integrated instrument. Using three primary sensing
elements—a vortex shedding velocity sensor,
an RTD temperature sensor, and a solid-state pressure
transducer—Multi-parameter Mass Vortex measures
the mass flow rate of gases, liquids and steam.
| The meter’s distinguishing feature, its ability
to monitor all process variables in a single location,
vastly improves measurement accuracy. This is because
systems that use external process measurements to
calculate mass flow do not compensate for conditions
that may change radically between the point of velocity
measurement and the point where upstream or downstream
pressure and temperature measurements are made.
Multiparameter Mass Flow meter Suppliers
Sierra was the first to introduce a Multiparameter
Mass Flow Meter to the market in the 1990’s.
Sierra's Multiparameter product line features
an inline version, the Model 240 Innova-Mass®
and a unique insertion version, the Model 241
Innova-Mass®. The Model 240 and Model 241
can measure the mass flow rate of any gas or liquid
and are ideally suited for saturated or superheated
steam. The 241 is available in high-pressure versions
capable of mass flow measurement of gases up of
5000 psig. In addition, the Model 240 SCT is ideal
for steam custody transfer applications and the
Model 240 EMS energy management system can provide
a DIRECT readout in BTU’s or Joules of the
energy consumed by a facility.
Multiparameter Mass Flow meter Products
| Model 240 Innova-Mass®
Inline Multiparameter Mass Flow Meters
- Volumetric flow monitoring of most gases, liquids
- Rangeable down to Reynold's number of 5000
- In-line sizes from 1/4 " to 8"
- 1% rate accuracy (liquids) or 0.7% for gases over
a 30:1 turndown
- Fully field configurable
- Loop powered with 4-20ma output
Read five process variables
with a single installed device!
Our Model 240 Innova-Mass provides a direct reading
of mass flow rate from a single entry point in the process
line and provides analog and digital outputs of five
process variables: mass flow rate, volumetric flow rate,
temperature, pressure, and fluid density. The ability
to sense all process conditions in a single location
greatly improves measurement accuracy and eliminates
the costly requirement for additional line penetrations
associated with traditional mass flow measurement systems.
The sophisticated on-board flow computer also incorporates
AGA-8 algorithms for natural gas measurement to reduce
billing and contract disputes. Smart electronics provide
access to all measured variables and programming menus,
and permit field-configuration directly from the control
panel or workstation via RS485, MODBUS or HART protocols.
Product accuracy is ± 1% of rate for liquids
and 1.5% of rate for gases and steam over a 30:1 range.
The Model 240 is hazardous area approved by FM, CSA,
| The Innova-Mass principle
Von Karman demonstrated that, when a
fluid flows past a bluff body, an alternating series
of vortices is shed from each side, creating areas of
fluctuating pressure. The frequency of the vortices
is directly proportional to fluid velocity. In commercial
vortex flow meters, the bluff body is called a "shedder
bar". The common trait of all shedder bars is sharp
corners, which enhance the energy of the vortices and
ensures boundary-layer separation at two defined points.
This characteristic is responsible for the extraordinary
linearity of the frequency of vortex shedding over a
wide velocity range. Innova-Mass uses a piezoelectric
sensor to measure the frequency of the Von Karman vortices.
This results in an intrinsically linear measurement
of fluid velocity over a wide range of Reynolds numbers.
The meter’s smart electronics automatically calculates
the Reynolds number based on the actual measured density
and viscosity, and then corrects for any non-linearity
at lower Reynolds numbers.
temperature and pressure sensing to calculate fluid
density at a single point. The solid-state micro-machined
silicon pressure transducer and platinum resistance
temperature detector provide exceptional accuracy and
stability. Accurate, reliable and cost-effective mass
flow measurement Conventional vortex flow metering systems
utilize inputs from external temperature and pressure
transmitters to supply an inferred mass flow rate output.
In these inferential mass flow devices, temperature
and pressure sensors are located somewhere in the pipeline
either upstream or downstream of the vortex flow meter,
but typically not at the same location in the pipeline.
This causes errors in calculating fluid density, resulting
in mass flow accuracy in the ± 3 to 5% range.
Because Innova Mass measures all process variables in
a single location, it offers mass flow accuracy in the
±1 to 2% range, and significantly reduces the
complexity and cost of installation.
|| Flow Indication & Control