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Supplier: Bronkhorst USA
Description: up to 1,250 slpm and actual gas calibrations on H2, N2, Ar, He and CO2 up to 10 slpm A liquid calibration station is included in support of the rapidly growing installed base of low flow liquid measurement and control Mass Flow Meters and Controllers. Flow
- Capabilities: Flow Instruments, Specialty Instrument / Equipment Repair Services
- Location: North America, United States Only, Northeast US Only
- Services: Bench (Off-site), Calibration Service, Rapid Turnaround, Product Sales - New, Troubleshooting and Repair
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Supplier: Sierra Instruments, Inc.
Description: Sierra provides accurate calibration services for mass flow meters and controllers, insertion thermal flow meters, vortex and ultrasonic flow meters. We have a wide range of NIST-traceable primary standard assets including: closed loop gas
- Capabilities: Flow Instruments, Process and Online Instruments
- Location: North America, United States Only, Southwest US Only, Midwest US Only, Europe Only, South Asia Only, East Asia / Pacific Only
- Services: Bench (Off-site), Field / On-site Repair, Calibration Service, Calibration Documentation, Online Documentation, Installation / Start-up, Rapid Turnaround, Rental / Lease
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Supplier: Teledyne Instruments
Description: The NALL series meters have flow ranges from 0-10 sccm to flows of 0-15,000 slm; provide analog outputs, ultra-low pressure drops, all metal (standard), can be hermetically sealed and operate up to 200?. The full scale range is specified by the end user. A NIST
- Mass Flow Rate Range: 0.0 to 41.3 lbs/min
- Electrical Output: Analog Current, Analog Voltage
- Operating Pressure: 500 psi
- Process Media Type: Gas
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Supplier: Aalborg Instruments
Description: Interface (RS-232 or RS-485) Multi-Drop Capability of up to 256 units (RS-485 option) Extensive Self Diagnostic with LCD (optional) indication Local key pad and 2x16 characters LCD display with adjustable back light (optional) Enclosure weather tight to IP65 standards Free AALBORG
- Electrical Output: Analog Current, Analog Voltage
- End Fittings: Socket Weld / Union
- Features: Measures Temperature, Audible or Visual Alarms, Averaging / Multi-Insertion, Controller Functions, Recorder / Totalizer Functions
- Interface Options: Serial / Digital
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Supplier: DRUM-MATES Inc.
Description: provides precision fluid measurement. Calibrations are easily set and the output will display an ongoing flow rate or an accumulating total flow. Offered with an aluminum or stainless steel housing for indoor or outdoor use, it’s a fine flow meter for general and
- Type: Turbine Meter
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Supplier: OMEGA Engineering, Inc.
Description: The FW1000 series are minimally invasive, low-cost segmented wedge flow sensors. The segmented wedge element provides a simple and reliable restriction for sensing flow as related to pressure differential. The FW1000 design allows users to install the meter in any full pipe
- Liquid Volumetric Flow Rate: 0.5000 to 15 GPM
- Electrical Output: Analog Current, Analog Voltage
- End Fittings: Threaded
- Media Temperature Range: 169 F
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Supplier: Proteus Industries Inc.
Description: Standard 800 Series metering flow switches are calibrated with water at approximately 25 °C / 77 °F. The use of fluids other than water may affect the accuracy of measurement due to differences in viscosity. Proteus' world-class calibration capability allows us to deliver
- Liquid Volumetric Flow Rate: 0.0500 to 60 GPM
- Electrical Output: Frequency
- End Fittings: Threaded
- Interface Options: Serial / Digital
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Supplier: Proteus Industries Inc.
Description: Standard 500 Series metering flow switches are calibrated with water at approximately 25°C / 77°F. The use of fluids other than water may affect the accuracy of measurement due to differences in viscosity. Proteus’ world-class calibration capability allows us to deliver
- Liquid Volumetric Flow Rate: 0.2000 to 4.5 GPM
- Electrical Output: Analog Voltage, Switch
- End Fittings: Threaded
- Media Temperature Range: -40 to 140 F
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Supplier: Cole-Parmer
Description: /Min/Avg provides time reference The Digi-Sense pressure and flow meter is designed to measure differential and static pressure, and calculate air velocity and airflow in ductwork. Ideal for evaluating of duct performance and proper airflow, air filter monitoring, adjusting motor
- Operating Pressure: 0.7252 psi
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Supplier: DRUM-MATES Inc.
Description: Measures Liquid Transfer Flow Rate & Flow Total Our high output turbine digital PVC meter offers durable, compact, high precision liquid flow measurement. Field calibrations can be easily set by the operator. Designed for indoor or outdoor use it is a perfect
- Type: Turbine Meter
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Supplier: Badger Meter
Description: The Flow Dynamics® Flow Gator Portable Flow Transfer Standard is designed for use as a portable flow transfer standard (FTS) to calibrate flow meters that cannot be easily removed from their piping system. Portable Calibrator. Field
- Calibrator Style: Hand Held, Portable
- Process, Environmental, Thermodynamic Properties: Flow
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Supplier: DRUM-MATES Inc.
Description: measurement. Calibrations are easily set, and the output will display an ongoing flow rate or with an accumulating total. It’s offered with an aluminum or stainless steel housing for indoor or outdoor use, it is a fine flow meter for general and extreme chemical
- Type: Turbine Meter
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Supplier: Flow Technology, Inc.
Description: determined. To calibrate a gas flow meter using the Autobell®, the flow meter must be installed upstream of the bell so that all gas flowing through it is captured by the calibrator. QUICK SPECS Primary standard gas calibration system Flow range of
- Calibrator Style: Fixed
- Computer Interface: Yes
- Operating Temperature: 65 to 75 F
- Process, Environmental, Thermodynamic Properties: Flow
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Supplier: E+E Elektronik
Description: leaks. Every E+E flow meter undergoes a precise factory calibration procedure at a pressure of 7 bar (102 psi), the corresponding calibration certificate is included in the standard scope of supply. The EE772 flow meter is available with an additional
- Velocity Flow Rate: 1.64 to 656 ft/sec
- Electrical Output: Analog Current, Analog Voltage, Frequency, Switch
- End Fittings: Threaded
- Features: Measures Temperature, Recorder / Totalizer Functions
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Supplier: E+E Elektronik
Description: essential prerequisite for calculating consumption costs or for finding leaks. Every E+E flow meter undergoes a precise factory calibration procedure at a pressure of 7 bar (102 psi), the corresponding calibration certificate is included in the standard scope of
- Velocity Flow Rate: 1.64 to 656 ft/sec
- Electrical Output: Analog Current, Analog Voltage, Frequency, Switch
- End Fittings: Threaded
- Features: Measures Temperature, Recorder / Totalizer Functions
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Supplier: E+E Elektronik
Description: installation and removal of the probe without interruption of the gas flow. Every EE776 flow meter undergoes a precise factory calibration procedure at a pressure of 9 bar (130 psi), the corresponding calibration certificate is included in the standard scope
- Velocity Flow Rate: 0.6562 to 656 ft/sec
- Electrical Output: Analog Current, Analog Voltage, Frequency, Switch
- End Fittings: Threaded
- Features: Measures Temperature, Recorder / Totalizer Functions
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Supplier: Proteus Industries Inc.
Description: 8000XHT Series flow meters provide accurate, reliable, and cost-effective measurement of heat transfer fluids and other liquids from -60 to 200 C / -76 to 392°. The Low/High-temperature capability is enhanced by Proteus’ world-class calibration expertise, to deliver superior
- Liquid Volumetric Flow Rate: 0.2500 to 16 GPM
- Electrical Output: Analog Current, Analog Voltage
- End Fittings: Threaded
- Features: Measures Temperature, Audible or Visual Alarms
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Supplier: Brooks Instrument
Description: Whether it’s dust, moisture, temperature extremes or wash-down requirements, the SLAMf Series elastomer sealed thermal mass flow controllers and meters deliver the precise accuracy and long-term stability of our proven SLA5800 family of meters and controllers. A specially
- Mass Flow Rate: 8.26E-6 to 6.88 lbs/min
- Electrical Output: Analog Current, Analog Voltage
- Interface Options: Serial / Digital, Network / Fieldbus
- Media Temperature Range: 149 F
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Supplier: Brooks Instrument
Description: Series mass flow controllers and meters. The SLA5800 Series features the high accuracy, high zero stability and high repeatability you expect from the industry leader in mass flow measurement and control technology. Engineered with advanced, configurable multi-gas/multi-rang e
- Mass Flow Rate: 8.26E-6 to 6.88 lbs/min
- Electrical Output: Analog Current, Analog Voltage
- Interface Options: Serial / Digital, Network / Fieldbus
- Media Temperature Range: 149 F
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Supplier: DRUM-MATES Inc.
Description: Measures Liquid Transfer Flow Rate & Flow Total Our high output turbine digital meter offers durable, compact, high precision fluid measurement as flow rate or total flow. Field calibrations can be easily set by the operator. Designed with a stainless steel
- Type: Turbine Meter
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Supplier: Siemens Process Instrumentation
Description: , manufacturing and calibration is evident in the wide range of versatile flow meter sensors and transmitters. FFCT040 is the advanced transmitter, offering a wider range of application solutions with improved performance. The FCT040 permits additional measurements and functions
- Interface Options: Other
- Type: Coriolis Meter
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Supplier: Teledyne Instruments
Description: The HFM-200 LFE meter has flow ranges from 0-10 sccm to flows of 0-15,000 slm; provides analog outputs, and is constructed of stainless steel. The full scale range is specified by the end user. A NIST traceable calibration certificate is standard. Cleaning for
- Mass Flow Rate Range: 0.0 to 41.3 lbs/min
- Electrical Output: Analog Current, Analog Voltage
- End Fittings: Flanged, Threaded
- Operating Pressure: 150 to 500 psi
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Supplier: Teledyne Instruments
Description: traceable calibration certificate is standard. With a full complement of fitting and elastomer options, the HFM-205/ HFC-207 covers a wide range of high flow applications.
- Mass Flow Rate Range: 0.0 to 6.88 lbs/min
- Electrical Output: Analog Current, Analog Voltage
- Features: Controller Functions
- Operating Pressure: 500 psi
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Supplier: Accuris
Description: STANDARD PRACTICE FOR CALIBRATION OF THE HEAT FLOW METER APPARATUS
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Supplier: Siemens Process Instrumentation
Description: SITRANS FMS300 is an electromagnetic flow sensor with a large variety of liners, electrode materials and with grounding electrodes as standard, all this ensures a perfect fit for almost every flow application. Benefits Fully welded construction that is extremely rugged and
- Velocity Flow Rate: 0.0 to 32.81 ft/sec
- Flow Meter Type: Velocity Flow Meter
- Media Temperature Range: -40 to 356 F
- Operating Pressure: 1450 psi
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Supplier: Teledyne Instruments
Description: The HFM-301 / HFC-303 meters and controllers have flow ranges from 0-25 slm to flows of 0-1000 slm; provide analog outputs, are constructed of stainless steel and have normally closed valves. The full scale range is specified by the end user. A NIST traceable
- Mass Flow Rate Range: 0.0 to 2.75 lbs/min
- Electrical Output: Analog Current, Analog Voltage
- Features: Controller Functions
- Operating Pressure: 500 psi
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Supplier: Brooks Instrument
Description: Multiple gases in one device equals maximum process flexibility and productivity. The GF40 Series elastomer sealed mass flow controllers and meters with Brooks Instrument’s exclusive MultiFlo™ technology provide the perfect choice for systems, processes and facilities that use a
- Mass Flow Rate: 8.26E-6 to 0.1376 lbs/min
- Electrical Output: Analog Current, Analog Voltage
- Features: Controller Functions
- Interface Options: Serial / Digital, Network / Fieldbus
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Supplier: Sierra Instruments, Inc.
Description: CalTrak™ SL-800 primary standard gas calibration systems offer a standardized accuracy of ±0.15% of reading, superior to all other commercial laboratory standards. The SL-800 is fast, primary, Mercury-free and easy-to-use. The dimensionally-based primary accuracy of the Cal
- Application Software Included: Yes
- Calibrator Style: Portable, Battery Powered
- Computer Interface: Yes
- Display Type: Digital Readouts, Video Display Terminal
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Supplier: Sierra Instruments, Inc.
Description: RedySmart thermal mass flow meters and mass flow controllers with ultra-stable no-drift CMOS (Complementary Metal Oxide Semiconductor) sensor are ideal for BioPharm OEMs with its modular design, cabling system, compact footprint, easy integration into a multi-unit gas mixing
- Gas Volumetric Flow Rate: 0.0 to 17.66 SCFM
- Electrical Output: Analog Voltage
- End Fittings: Compression, VCO® / VCR®, Other
- Features: Recorder / Totalizer Functions
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Supplier: Siemens Process Instrumentation
Description: , manufacturing and calibration is evident in the wide range of versatile flow meter sensors and transmitters. FCT020 is the standard transmitter, suitable for general purpose applications. It delivers accurate and precise measurements of mass flow rate, density,
- Features: Measures Density, Measures Temperature
- Interface Options: Other
- Type: Coriolis Meter
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Supplier: ES Systems S.A.
Description: coefficient and high measurement accuracy. The standard system provides analog signal output, with excellent repeatability and hysteresis combined with good resolution. Calibration gas is air, but other non-aggressive gases can be also available upon request. The compact size of the
- Mass Flow Rate: 4.13 lbs/min
- Electrical Output: Analog Current
- Flow Meter Type: Mass Flow Meter
- Operating Pressure: 160 psi
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Supplier: TSI Incorporated
Description: Range: 0 to ± 30 Std L/min Accuracy: 2% of reading Calibration: Air, N2 Includes Standard Accessory Kit The TSI Mass Flow Meter 5200-1 provides a bi-directional flow rate measurement with 2% of reading accuracy across a wide flow range. Labeled a Flow
- Mass Flow Rate Range: 0.0 to 0.0826 lbs/min
- Process Media Type: Gas
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Supplier: TSI Incorporated
Description: Range: 0 to ± 30 Std L/min Accuracy: 2% of reading Calibration: CO2 Includes Standard Accessory Kit The TSI Mass Flow Multi-Meter 5200-7 provides a bi-directional flow rate measurement with 2% of reading accuracy across a wide flow range. Integrated
- Mass Flow Rate Range: 0.0 to 0.0826 lbs/min
- Process Media Type: Gas
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Supplier: TSI Incorporated
Description: Range: 0 to ± 300 Std L/min Accuracy: 2% of reading Calibration: CO2 Includes Standard Accessory Kit The TSI Mass Flow Multi-Meter 5300-5 provides a bi-directional flow rate measurement with 2% of reading accuracy across a wide flow range. Integrated
- Mass Flow Rate Range: 0.0 to 0.8259 lbs/min
- Process Media Type: Gas
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Supplier: TSI Incorporated
Description: Range: 0 to ± 30 Std L/min Accuracy: 2% of reading Calibration: Air, O2, N2 Includes Standard Accessory Kit The TSI Mass Flow Multi-Meter 5200-2 provides a bi-directional flow rate measurement with 2% of reading accuracy across a wide flow range
- Mass Flow Rate Range: 0.0 to 0.0826 lbs/min
- Process Media Type: Gas
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Supplier: SONOTEC Ultraschallsensorik Halle GmbH
Description: The compact ultrasonic flow sensor SONOFLOW CO.55 quickly detects the flow rate of liquids in flexible tubes. Due to its construction the clamp-on sensor is particularly suitable for applications in fields with strict hygienic standards. The tube is easily put into the sensor
- Liquid Volumetric Flow Rate: 0.7920 to 3.17 GPM
- Electrical Output: Analog Current, Frequency
- End Fittings: Clamp
- Features: Programmable, Sanitary
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Supplier: Kurz Instruments, Inc.
Description: industry Solvent and VOC recovery Air Sampling General purpose mass flow, R&D Flow Calibration Standards Nuclear power plant radiation monitors Air Sampling in D.O.E. facilities O.E.M applications
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Supplier: Proteus Industries Inc.
Description: digital signal processing Standard 0–10 VDC or 0–5 VDC, and 4–20 mA outputs On-board relay for redundant interlock, with userspecified, factory-programed trip point Optional custom calibration available to account for viscosity effects of fluid and temperature NEMA 4X / IP66 design
- Liquid Volumetric Flow Rate: 0.5000 to 60 GPM
- Electrical Output: Analog Current, Analog Voltage, Switch
- End Fittings: Threaded
- Media Temperature Range: -40 to 194 F
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Supplier: Sierra Instruments, Inc.
Description: calibrate high flow gas meters and controllers. Like all members of Sierra’s CalTrak™ family of products, CalTrak™ XL is a primary standard piston prover that operates with the press of a button--assuring you the ultimate in calibration accuracy, convenience, ease-of-use,
- Application Software Included: Yes
- Calibrator Style: Fixed, Battery Powered
- Computer Interface: Yes
- Display Type: Digital Readouts
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Supplier: ASTM International
Description: 1.1 This practice covers a means for calibration of the heat flow meter apparatus in conjunction with Test Method C518. The apparatus shall be calibrated as a unit, with the heat flux transducer(s) installed in the apparatus using either standard reference materials
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Description: ISO 14934-2:2013 describes three methods for calibration of total hemispherical radiometers and total heat flux meters that are exposed to a well-defined radiation from a radiant heat source. The equipment is designed to minimize influences due to convective heat transfer during
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Supplier: Advanced Test Concepts, Inc. (ATC, Inc.)
Description: Micro-Flow measurement ranges. Portable transfer flow standard. Calibration of leak test orifices and instruments. Gauging of micron sized holes. Pressure/Vacuum range of 2-25 psia.
- Gas Volumetric Flow Rate: 8.83E-7 to 3.50E-5 SCFM
- End Fittings: Compression
- Features: Measures Temperature
- Interface Options: Serial / Digital
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Description: . Additionally, the standard FS7 sensor is also available with a housing which is easily implemented into various applications. Further advantages of the FS7 flow sensor include: Easy adaptation in various applications and housings Excellent long-term stability Simple
- Velocity Flow Rate: 0.0 to 328 ft/sec
- Operating Temperature: -4 to 302 F
- Process Media Type: Gas
- Type: Thermal Meter
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Supplier: Advanced Test Concepts, Inc. (ATC, Inc.)
Description: Medium and low flow range measurement. Portable transfer standard. Calibration of Leak Test orifices and instruments. Measurement of gas mixtures. Pressure up to 500 PSIG.
- Gas Volumetric Flow Rate: 3.53E-5 to 0.8828 SCFM
- End Fittings: Compression
- Features: Measures Temperature
- Interface Options: Serial / Digital
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Supplier: Brooks Instrument
Description: The 2001 Series flow meters provide a means of indication at the lowest cost for non-corrosive flow applications. The tapered metering tube is integrally machined in the acrylic body while a standard direct reading scale engraved on the body affords maximum
- Liquid Volumetric Flow Rate: 0.3333 GPM
- Media Temperature Range: 160 F
- Mounting Type: In-line
- Operating Pressure: 100 psi
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Featured Products Top
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At Shaw Moisture Meters, we provide full UK coverage for all our equipment with our onsite dewpoint meter calibration service. UK customers can take advantage of our onsite calibration service – an ideal option for customers with mission critical applications or who are unable to return (read more)
Browse Instrument Calibration Services Datasheets for Shaw Moisture Meters -
recognised standards of quality and calibration, we are committed to providing the highest quality products and services. At Shaw Moisture Meters, we advise an annual service and calibration of your dewpoint equipment. However, the calibration interval will depend on the instrument type and (read more)
Browse Instrument Calibration Services Datasheets for Shaw Moisture Meters -
, Frequency Extenders for Noise Figure Meters and other accessories are also available. Maury Noise Calibration Systems and Noise Calibration Accessories are used to: make receiver noise measurements (such as noise figure and effective input noise temperature); to calibrate solid state noise (read more)
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Sierra was the first to introduce multivariable mass vortex flow meters to the market in the late 1990s with the InnovaMass "S-Series" product line-the 240S and (read more)
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How Mass Flow Controllers Enable Accurate Calibration Standards Calibration is a critical, yet often overlooked aspect of benchtop chromatography. Guidance on (read more)
Browse Calibration Instruments Datasheets for Environics, Inc. -
precise, traceable gas calibration. Accurate analytical results depend on how well gas analyzers, sensors, and monitoring instruments are verified against known calibration standards. To achieve this, analytical laboratories and industrial operators employ controlled gas sources that provide consistent (read more)
Browse Permeation Instruments Datasheets for Environics, Inc. -
gas calibration. Accurate analytical results depend on how well gas analyzers, sensors, and monitoring instruments are verified against known calibration standards. To achieve this, analytical laboratories and industrial operators employ controlled gas sources that provide consistent, quantifiable (read more)
Browse Calibration Instruments Datasheets for Environics, Inc. -
measurement has previously been achieved by using a bridge plate and master rail, in combination with a dial gauge and level meter. This method is time-consuming and is prone to error as the measurements are recorded manually. The XK10 uses laser measurements to capture two points on each rail, allowing (read more)
Browse Calibration Instruments Datasheets for Renishaw -
scale on virtually all flowable solids, significantly improving the industry standard. Flexible The CentriFlow® Meter is not affected by changes in product elasticity, density, shape or friction. Fluctuations in flow rate don't impact it's accuracy. The linearity of (read more)
Browse Solids Flow Meters Datasheets for Eastern Instruments -
Delivering accurate steam flow measurement in a space-saver design, the V-Cone Steam Flow Meter from McCrometer is ideal for Campus District Energy Facilities and eliminates many of the common equipment layout problems associated with steam processes in HVAC and Electric Power Co (read more)
Browse Flow Meters Datasheets for McCrometer, Inc.
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Field Calibration Flowmeter Applications
This system consists of a transfer standard turbine flowmeter, a metering run, and electronics that is mounted on a hand truck for mobility. The electronics provide instantaneous indication of the flowrate and flowing temperature, a total flow indicator, as well as an accumulative test total
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PIC18F2520 MCP3909 3-Phase Energy Meter Reference Design - Meter Test Results and Adapting the Meter Design for other Requirements
taken from a shipped OFFSET for I (0.5A, 220V, PF=1) - 2.5 seconds RMSenergy meter that was simply 're-calibrated' using the (Note 1, Note 2) Fluke electrical power standard and the calibration Note 1: Important! The approach to calibration software GUI that comes with the kit. No hardware used
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In-Situ Calibration - Methods & Pitfalls of Thermal Mass Flow Meter Sensor Field Validation
Mid-to-large size facilities and campuses inevitably have hundreds of ow instruments to monitor, maintain, and repair. For a reliability engineer, ensuring that all instrumentation meets ISO 9000 or similar standards is a time-consuming responsibility. These standards mandate that precision
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Fast and Accurate Calibration of Infusion Pumps
Products Products We offer the widest product range of low-flow (mass) flow meters and controllers on the market. Numerous styles of both standard and bespoke instruments can be offered for applications in laboratory, machinery, industry and hazardous areas. Expertise Expertise Customer
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Thrust and Drag: Its Prediction and Verification > Precision and Propagation of Error
… Subsonic Flow Meters Venturis and Nozzles Orifices Critical Venturi Flow Meters Calibration Techniques Calibration by Calculation Experimental Calibration Calibration by Fabrication Elemental Error Sources Discharge Coefficient Calculated Q Experimentally Determined Cd Comparison with a Standard Flow Meter Calibration by Traverse Calibration by …
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http://etd.auburn.edu/bitstream/handle/10415/2923/Dissertation_Sharda_Final.pdf?sequence=2
measured using nozzle flow measurements or installing a standard calibrated flow meter on the circuit .
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Evaluating airborne radionuclide concentrations in the tank farms
Air samplers will be equipped with flow meters calibrated with standards traceable t o the National Institute of Standards Testing (NIST).
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Cardiorespiratory and metabolic costs of continuous and intermittent exercise in man
Inspired gas flow was measured with a Venturi-type flow meter calibrated with standard flows from rotameters.
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Advances in Manufacturing Technology
… standard flow meter is used in different conditions; u6 is the flow measurement uncertainty caused by data acquisition, signal processing, data processing and communication; u7 is the combined uncertainty of the standard flow facility, on which the standard flow meter is calibrated .
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An Improvised Oxygen Supply System for Pandemic and Disaster Use
As standard flow meters are calibrated to be used at a 50 psi driving pressure (at sea level at 20°C), a conversion chart was generated (Figure 2).
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Development of Liquid Flow Metering Assemblies for Space
The quality of the test bench is such that it is currently investigated whether the bench can become a standard for flow meter calibrations , for different liquids and various mass flow rate ranges.
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Global Technical Regulation No. 15 on Worldwide Harmonized Light Vehicles Test Procedure.
Q K = Q where: Q is the air flow rate at standard conditions (101.325kPa, 273.15K), m /s; Q is the air flow rate of the calibration flow meter at standard conditions (101.325kPa, 273.15K), m /s; K is the …
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Analysis of pressure fluctuations during water evaporation in spouted bed
The air flow rates were measured by a calibrated standard orifice flow meter and its temperature measured and kept constant by a digital PID temperature controller model HW2000 (Coel Ltd., Sao Paulo, Brazil) connected to a 4 kW electrical heater.
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The use of an ultrasonic measuring system to construct a working standard of air flow speed
The convergent channel systems of the working part, calibrated with standard flow meters , the uncertainty in the flow-rate measurement of which is ±(0.25–0.30)%, serve as extremely accurate instruments for measuring flow speed, averaged over the channel section.