Thank you for purchasing the Model F-5500 Thermal Gas Mass Flow Meter from
ONICON. The Model F-5500 is one of the most technically advanced flow meters
in the world. An extensive engineering effort has been invested to deliver advanced
features, accurate measurement performance and outstanding reliability.
This Instruction Manual contains the electrical and mechanical installation instructions
as well as details for programming, maintaining and troubleshooting the meter.
This manual is divided into the following sections: Introduction, Installation, Wiring,
Operation, Maintenance, Troubleshooting, Appendices, Glossary and Index.
Theory of Operation
The Model F-5500 is an innovative Thermal Mass Gas Flow Meter and Temperature
Transmitter. It is microprocessor-based and field programmable. The F-5500 thermal
sensor operates on the law that gases absorb heat. A heated sensor placed in an air
or gas stream transfers heat in proportion to the stream’s mass flow velocity. There
are two sensor elements. One sensor element detects the gas temperature and a
second element is maintained at a constant temperature above the gas temperature.
The energy applied to the heated sensor to maintain a constant temperature differential
(constant ∆ T) is directly proportional to the mass flow velocity. The F-5500 flow
meter maintains accurate flow measurement over a large temperature and pressure
range.
Mass Flow
The Model F-5500 measures mass flow; an advantage over other flow meters which
measure volumetric flow. Volumetric flow is incomplete because temperature and
pressure are unknown and must be measured separately. For example, the mass
flow of a gas depends on its temperature and pressure. As temperature and pressure
changes, the gas volume changes but not its mass. Therefore a device measuring
mass flow is independent of temperature and pressure changes. The Model F-5500
provides a direct measurement of gas flow in mass units (kg/hr, lb/hr), standard units
(SCFM, SLPM) or normal units (NM3/hr, NLPM) with no additional temperature or
pressure measurements required.
DDC-Sensor™ Technology Description
The ONICON DDC-Sensor™ is a new state of the art sensor technology used in the
ONICON Model F-5500 Thermal Gas Flow Meter. The DDC-Sensor™, a Direct Digitally
Controlled sensor, is unlike other thermal flow sensors available on the market.
Instead of using traditional analog circuitry, the DDC-Sensor™ is interfaced directly to
the F-5500 microprocessor for more speed and programmability. The DDC-Sensor™
quickly and accurately responds to changes in process variables by utilizing the
microprocessor to determine mass flow rate, totalized flow, and temperature.
ONICON’s DDC-Sensor™ provides a technology platform for calculating accurate gas
correlations.
11451 Belcher Road South, Largo, FL 33773 • USA • Tel +1 (727) 447-6140 • Fax +1 (727) 442-5699 • sales@onicon.com
F-5500 Thermal Mass Flow Meter Manual 06/17 - 2030 / 107023 Page 12
Model F-5500
DISCLAIMERINTRODUCTION
Introduction
Product
Description
Mass Flow
Welcome
DDC-Sensor™
Technology
Flow
Calibration
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