OMEGA’s high accuracy Gas
Turbine Series measures the
volumetric flow of gas through a
pipeline. Gas flowing through the
meter turns the turbine rotor at an
angular velocity which is
proportional to the velocity of the
gas being measured. As the
turbine rotor turns, the rotor blades
pass a non-intrusive pickup coil that
generates an electrical signal,
referred to as a pulse. Each pulse
represents a specific volume of gas
(i.e. ACF/AM3). The totalization of these
pulses results in the total volumetric flow. The total
volume can be converted to mass flow total (SCF or
NM3) using reference conditions and base density, or
by applying various correction techniques.
Standard calibrations for these gas turbine systems
are performed at a reference density of 0.1 lb/Ft3. A
10-point calibration certificate (traceable to NIST or
other recognized national laboratory) is supplied with
each meter. Standard calibration includes a calculated
K-factor for gas that is derived from a 10-point NIST
calibration for water. Calibrations at customer’s actual
operating densities can be performed with special
OMEGA’s gas turbine flowmeters offer high accuracy
measurement of gases for a wide variety of applications,
including fiscal measurement, plant cost allocation,
energy consumption/conservation, etc. These gas
turbine systems are suitable for all non-corrosive
gases such as natural gas, air and nitrogen. Special
versions of this series are available for use on
corrosive gases, such as “off-gas” and feature NACEMR175
trim and self-lubricated ceramic ball bearings.
Contact OMEGA for further details.
An OMEGA® gas turbine flowmeter should be chosen
so that it is operated within its most accurate range.
The capacity of a turbine flowmeter is based on the
actual volumetric flow rate and is expressed as actual
cubic feet (ACF) or actual cubic meters (AM3). The
lower limit of operation is a function of the gas density
SPECIFICATIONS (TURBINE) Over-range: 150% of maximum flow (intermittently) Turn Down Range: Dependent on gas density at user’s operating conditions Linearity: ±1% of reading typical Repeatability: ±0.25% over tabulated repeatable range Available Temperature Range: -157 to 149°C (-250 to 300°F) continuous End Fittings (Standard): NPT Bearing Styles: Self-lubricating, ceramic hybrid ball bearings Materials: 316/316L dual rated stainless steel with 17.4 pH rotor
SPECIFICATIONS (SIGNAL CONDITIONER) Input Signal Type: MCP pickup Input Frequency Range: 0.2 Hz to 4 KHz Signal Level: 10 mV rms to 30 Vdc Power Supply: 13 to 30 Vdc standard, 100 to 240 Vac (-AC) (optional), reverse polarity protection Analog Output: 4 to 20 mA, 1 to 5V, 24 mA overflow condition (dip switch selectable) Load Resistance: Max 650 Ù @ 24 Vdc Accuracy: °0.02% of full scale Temperature Drift: 40 ppm/°C Pulse Output: 0 to 5V Recommended Minimum Load Resistance: 50 KÙ Pulse Scaling: Divide by 1,10,100 per flow unit of measure Hi/Lo Alarm (Optional): Relay (2A, 30 Vdc), 0 to 5V, open collector (0.5A, 30V) Communications: RS232 port for configuration and diagnostics Linearization: Up to 20 points Operating Temperature: -40 to 85°C (-40 to 185°F) Humidity: 0 to 90% non-condensing Enclosure: Extruded aluminum explosion-proof ATEX Port: 3/4-14 NPT Regulatory: CE compliant
† All amounts shown in USD Note: Systems come complete with NIST certificate with K Factor, turbine, signal conditioner in ATEX enclosure, and operator’s manual.
± The purchase of FLSC-C-CABLE and downloadable software (free at FTP.Omega.com) are necessary to program the signal conditioners in the field.
For units with 100 to 240 Vac power, add suffix "-VAC" to model number, add $150 to cost.
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