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Gas Flow CalibrationLaboratory Accreditation Bureau Certifate #L2115

ISO 17025 Gas Flow Calibration Services by Graftel

Rotometer Calibration
Air and Gases
Laminar Flow Element
Calibration
Flowmeter Calibration
Air and Gas
Rotameter calibration services. Laminar flow meter calibration services. Gas flow calibration services.
Sonic Nozzle and Sonic Choke Calibration
Sonic Nozzle and Sonic Choke Calibration Services.

Graftel maintains five NIST traceable primary gas flow calibration systems. Flow rates between 1sccm up to 1,500 slm are measured. The pressure range is 0 to 1000 psig, (0 to 69 bar). Each system can achieve uncertainties up to 0.2% of reading. Air or gas or mixture of gasses may be used. This includes flammable gasses.

Graftel can also perform these calibrations at your site.


Gas Flow Calibration Services Include

All flow calibrations completed by Graftel come with:

Listed below is a small sampling of the types of equipment we can perform flow calibrations on in our labs.

Digital RH Meter
Analog RH Meter
Dewpoint Meter
Transducers
Velocity Meters Rotometers
Coriolis Meters
Thermal Mass Flowmeters
Laminar Flowmeters
Orifice Plates
Critical Nozzles
Controllers
Pressure Gauges to 1000psi
Turbine Meters
Positive Displacement Meters
LFE
Vortex
V-Cone
Coriolis
Ultrasonic Flow Gauges
Flow Meters
Rotometers
Anemometers
Hygrometers

Manufacturers we have Calibrated

Graftel's labs have worked with hundreds of name brand and sometimes not-so-name brand flow meters and gauges, we specialize in working with you to keep your valuable equipment calibrated. Listed below is a a small sampling of some of the manufacturers we complete flow calibration's with on a regular basis.

If you don't see the manufacturer of your equipment here, don't panic! Contact us with your information and we'll take care of the rest.

Great Plains Industries
Brooks
Brooks "SMART" meters
Dwyer
Omega
Aalborg
Flow Technology
Foxboro
Panametrics
Fischer - Porter
MEM
Yokogawa
Gilmont
Flocat
Hedland
Eldridge Products
FTI
TSI
Solomat
Alnor
Sierra
Hedland
Meriam
Cosa
Schutte & Koerting
Draeger
JLC
Fox Valve
Alicat Scientific
UFM
ATC
Vaisala
Victor
Shaw
MKS Flow
Jewett
Hastings
General Eastern
Blue-White Industries
Madgetech
American Meter Company
Eqimeter
Conbraco
Kurz
Testo
Sper Scientific
Davis
Graywolf
Cole-Parmer
Fischer Scientific
Ertco
Millipore

...And MANY More!

Gas Primary A

This system's flow rate range is 0.06 to 6 sccm, (0.00012 to 0.012 scfh). The pressure range is 0 to 1000 psig, (0 to 124 bar). The primary standard used is a Brooks mercury sealed flow tube. The system's secondary standard is a laminar flow element. The uncertainty in mass flow rate is up to 0.20% of reading.

Gas Primary B

This system's flow rate range is 3 to 140 sccm, (0.005 to 0.3 scfh). The pressure range is 0 to 1000 psig, (0 to 124 bar). The primary standard used is a Brooks mercury sealed flow tube. The system's secondary standard is a laminar flow element. The uncertainty in mass flow rate is up to 0.20% of reading.

Gas Primary C

This system's flow rate range is 0.05 to 3 slm, (0.1 to 6 scfh). The pressure range is 0 to 1000 psig, (0 to 124 bar). The primary standard used is a Brooks mercury sealed flow tube. The system's secondary standard is a laminar flow element. The uncertainty in mass flow rate is up to 0.20% of reading.

Gas Primary D

This system's flow rate range is 2 to 88 slm, (4 to 186 scfh). The pressure range is 0 to 1000 psig, (0 to 69 bar). The primary standard used is a Brooks mercury sealed flow tube. The system's secondary standard is a laminar flow element. The uncertainty in mass flow rate is up to 0.20% of reading.

Gas Primary E

This system's flow rate range is 23 to 1168 slm, (1 to 41 scfm). The pressure range is 0 to 1000 psig, (0 to 69 bar). The primary standard used is a sonic nozzle. The system's secondary standard is a laminar flow element. The uncertainty in mass flow rate is up to 0.20% of reading.


Rotometer Calibration in liquids and gases ISO 17025 and NIST traceable

Rotameter Calibration Services by Graftel Inc.

Rotameters are a gauge that consists of a graduated glass tube containing a free float for measuring the flow of a fluid or gas. Usually a rotameter will have a tube that holds a pellet or cylinder that will move up the scale according to the pressure from the gases or liquids it is measuring.

During its use, a rotameter will accumulate foreign material inside and will eventually lose its sensitivity to measurement. In many cases, a yearly rotometer calibration will keep your measurements accurate and save you time and money in maintenance. Graftel's, calibration lab has calibrated Rotameters from dozens of manufacturers, and we have established yearly rotometer calibration schedules with many of our clients. listed below are several that we have calibrated to NIST accuracy and ISO 17025.

As for services, Graftel can have your liquid or gas Rotameter calibrated and returned to you in 5 business days or less! Graftel also offers ISO 17025 Gas-flow calibrations for your rotometer that are NIST traceable. For more information about our ISO 17025 calibration capabilities, feel free to read our certificate and scope or contact us with your questions.

Contact Us today if you have a rotameter that needs a NIST traceable ISO 17025 calibration.


Laminar-Flow Element Calibration

Laminar flow element calibration by Graftel. Laminar flow meter calibration by Graftel. Laminar flowmeter services by Graftel.

Laminar flow element (LFE's) calibration is a high accuracy job that few flow calibration facilities can perform. The volumetric flow rate is determined by creating a pressure drop across a unique internal restriction, known as a Laminar Flow Element, and measuring differential pressure across it. The restriction is designed so that the gas molecules are forced to move in parallel paths along the entire length of the passage; hence Laminar (streamline) flow is established for the entire range of operation of the device. Unlike other flow measuring devices, in laminar flow meters the relationship between pressure drop and flow is linear.

Our facility not only has the capability to calibrate your laminar flow elements, but since we build our own portable flow standards and local leak rate monitors, our experience isn't only in calibration!

We have calibrated laminar flow elements manufactured by:

If your manufacturer isn't listed above, contact us with your product information and we'll send you a quote!


Sonic Nozzle and Sonic Choke Calibration and manufacturing services

Sonic Nozzle and Sonic Choke calibrations by Graftel.

Graftel has become a reseller and calibration source for Fox Valve! This means that we can now bring your calibrated sonic nozzles and calibrated sonic chokes at a very competitive price! Contact a Graftel Representative today to receive a quote on a calibrated sonic choke! Fox valve also is a manufacturer of:

Critical flow nozzles, also called sonic chokes, have been used to maintain stable gas flow rates in systems where maintaining stable, accurate gas flow rates is essential to overall system performance. By establishing a shock wave in the venturi, the sonic choke establishes fixed flow rates unaffected by P or any fluctuations, surges, or changes in downstream pressure. With no moving parts, sonic chokes provide the simplest and most reliable way to regulate gas flows. This is particularly true when high pressure, high temperature, cryogenic, explosive, or high purity gasses need to be regulated.

Industry uses many different names to describe this equipment. Here is a partial list of descriptions that can be used interchangeably:

Sonic chokes are converging/diverging nozzles whose operating principles are discussed in every fluid mechanics textbook. They offer the designer a remarkably simple way to regulate stable gas flow rates.

Contact a Graftel Representative today to learn more about purchasing a Calibrated Sonic Choke or Sonic Nozzle.