ISO/IEC 17025 Accredited Flow Calibration
Accurate flow measurement is essential to safe, efficient, and compliant operations. Our national network of local calibration providers delivers the precision your processes rely on, supporting product quality, protecting resources, and minimizing costly disruptions.
Our Flow Calibration Services
Precise flow measurement is critical across industries such as chemical processing, water and wastewater treatment, pharmaceuticals, food and beverage production, and energy generation.
When flow instruments drift out of specification, the effects can be far-reaching, from process inefficiencies and product quality problems to environmental compliance risks and unnecessary financial loss. The Accredited Labs network offers complete flow calibration services to keep your instruments performing within their required accuracy ranges.
Our Process
Flow calibration involves verifying and adjusting instruments that measure the rate of fluid movement through pipes, channels, or other controlled pathways. Each instrument is compared to certified reference standards with known, traceable flow rates to identify any deviations from its intended performance.
Experienced technicians assess each device across its full operating range under precisely controlled flow conditions, document all variations, and may make the adjustments needed to restore accuracy. If an instrument cannot be restored to the required accuracy range, you receive detailed reporting with the data necessary for maintenance planning, corrective action, or replacement decisions.
All flow calibrations follow internationally recognized protocols that promote consistency, reliability, and full measurement traceability. Every instrument is returned with documentation linking its accuracy to national flow measurement standards—supporting quality management systems, regulatory requirements, and continuous process control.
Types of Flow Measuring Instruments We Calibrate
Our comprehensive flow calibration services cover the complete spectrum of flow measuring technologies used across industries:
- Magnetic Flow Meters: These versatile instruments measure conductive fluid flow using electromagnetic principles. They require calibration of both the flow sensor and signal processing electronics to ensure accurate measurement across varying fluid conditions and flow rates.
- Turbine and Positive Displacement Meters: Mechanical flow meters measure flow through rotating elements that require calibration to account for wear, viscosity effects, and mechanical tolerances that affect measurement accuracy over time.
- Ultrasonic Flow Meters: These non-invasive instruments use acoustic signals to measure flow and require calibration of timing circuits, signal processing algorithms, and transducer characteristics to maintain measurement accuracy across different fluid types and pipe conditions.
- Vortex Flow Meters: These instruments measure flow by detecting vortices created by flow obstructions. Calibration ensures accurate vortex detection and frequency measurement across the instrument's flow range and various process conditions.
- Differential Pressure Flow Meters: Including orifice plates, venturi tubes, and flow nozzles, these instruments calculate flow from pressure differences. Calibration verifies both the pressure measurement accuracy and flow calculation algorithms.
- Thermal Mass Flow Meters: These instruments measure flow by detecting heat transfer effects in flowing fluids. Calibration ensures accurate temperature measurement, heating element control, and flow calculation across different gas compositions and process conditions.
- Coriolis Mass Flow Meters: These precision instruments measure mass flow directly through Coriolis force effects. Calibration involves verification of frequency measurement, phase detection, and mass flow calculations across varying fluid densities and viscosities.
- Variable Area Flow Meters: Including rotameters and other variable area devices, these instruments require calibration to ensure accurate flow indication across their measurement range and various fluid conditions.
- Open Channel Flow Measurement: Weirs, flumes, and other open channel flow measurement devices require calibration of level measurement systems and flow calculation algorithms to ensure accurate flow determination.
Find Flow Calibration Services
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Accutek Lab
Accutek Lab has been providing reliable and cost-effective pipette calibration services across the United States since 1996.
Calibration ServicesPipette Calibration -
Aldinger
Since 1972, Aldinger has been providing top-quality calibration services for test and measurement equipment in Texas and beyond.
Calibration ServicesDimensional Calibration Electrical Calibration Flow Calibration Force Calibration Mass Calibration +7 more -
Cal-Cert
Cal-Cert is committed to providing the highest level of calibrations and certification service to our customers.
Calibration ServicesForce Calibration Torque Calibration Mass Calibration Pressure Calibration Temperature Calibration +3 more -
Cal-Labs
Cal-Labs has provided quality calibration in Southern California since 1977. We are A2LA accredited to ISO 17025.
Calibration ServicesDimensional Calibration -
Calibration Services Inc.
Calibration Services, Inc. (CSI) is an on-site and in-house calibration firm specializing in calibration and service of mechanical testing devices.
Calibration ServicesForce Calibration Torque Calibration Mass Calibration Dimensional Calibration Pressure Calibration +3 more -
Cal Tec Process Management
The calibration specialists at CTPM have been providing precision calibration and quality assurance since 1987.
Calibration ServicesForce Calibration Torque Calibration Mass Calibration Dimensional Calibration Pressure Calibration +2 more -
Calser Calibrations
Since 1979, Calser Calibrations has delivered trusted, precision calibration services backed by a commitment to quality and reliability.
Calibration ServicesConstruction Materials Testing Equipment Calibration Dimensional Calibration Force Calibration Mass Calibration Pressure Calibration +3 more -
CMG Sales, Inc.
CMG Sales, Inc. is a leading manufacturer sales representative and ISO 17025 accredited calibration laboratory providing services to manufacturers nationwide.
Calibration ServicesCoating Thickness Calibration Color Calibration -
Color Calibration Group
Color Calibration Group has been providing professional calibration services for all your color, light, and viscosity calibration needs for over 25 years.
Calibration ServicesCoating Thickness Calibration Color Calibration -
ETI Precision
ETI has been a leader in the calibration, repair, and sale of test and measurement equipment since 1994, and covers all 50 states.
Calibration ServicesElectrical Calibration Force Calibration Torque Calibration Dimensional Calibration Pressure Calibration +2 more -
Holts Precision, Inc.
For over 60 years Holts Precision, Inc. has performed calibrations & repairs on all major brands of gaging equipment.
Calibration ServicesDimensional Calibration Electrical Calibration Force Calibration Mass Calibration Pressure Calibration +2 more -
Huston-DePue
Established in 1960, HDCL is staffed by experienced professionals who understand the critical role accurate measurement plays in quality control and regulatory compliance.
Calibration ServicesFlow Calibration Force Calibration Torque Calibration Mass Calibration Dimensional Calibration +3 more -
Instrument Technologies, Inc.
For over three decades, Instrument Technologies, Inc. (ITI) has been a trusted partner for regulated industries seeking precision, compliance, and operational reliability.
Calibration ServicesFlow Calibration Mass Calibration Dimensional Calibration Pressure Calibration Time Calibration +1 more -
IPM, Inc.
Industrial Process Measurement, Inc. has been in the instrument supply, service and calibration business for over 30 years.
Calibration ServicesDimensional Calibration Electrical Calibration Flow Calibration Force Calibration Humidity Calibration +6 more -
J & J Calibration Service
J&J Calibration Service, an ISO-17025 accredited company, offers unmatched mobile calibration capabilities and laboratory calibration services.
Calibration ServicesDimensional Calibration Electrical Calibration Force Calibration Pressure Calibration Temperature Calibration +1 more -
OCS Technologies
Founded in 1930, OCS Technologies is a trusted multi-discipline calibration service provider as well as leading product distributor.
Calibration ServicesForce Calibration Torque Calibration Mass Calibration Dimensional Calibration Pressure Calibration +3 more -
OnCal
With over 23 years of experience in pipette calibration in the Pacific Northwest, the OnCal Corporation guarantees seamless and dependable metrology services.
Calibration ServicesPipette Calibration -
Polymer Testing Instruments
Since 1996 Polymer Testing Instruments Inc. has provided high quality service and calibration of equipment for the rubber, plastics, and energy industries.
Calibration ServicesForce Calibration Torque Calibration Dimensional Calibration Pressure Calibration Temperature Calibration +1 more -
Precision Calibration Systems
PCS is a full-service ISO 17025 Accredited calibration laboratory, founded with the goal of providing reliable and accurate instrument calibration service.
Calibration ServicesFlow Calibration Force Calibration Torque Calibration Mass Calibration Dimensional Calibration +4 more -
Quality Control Services
Quality Control Services is an established, accredited calibration services and laboratory equipment company with over 40 years of experience.
Calibration ServicesForce Calibration Mass Calibration Pipette Calibration Temperature Calibration -
Quality Surveillance, Inc.
QSI has been providing Los Angeles, Ventura, Santa Barbara and Santa Clarita Counties with reliable and cost effective metrology services since 1992.
Calibration ServicesDimensional Calibration Force Calibration Mass Calibration Pressure Calibration Temperature Calibration +3 more -
Scale Service & Supply
From laboratory balances to truck scales, Scale Service & Supply has been providing precision calibration for weighing systems since 1987.
Calibration ServicesScale Calibration Mass Calibration -
Servo Innovations
Servo Innovations, founded in 2005, has earned industry-wide trust for its accredited calibration, repair, and technical services.
Calibration ServicesFlow Calibration Force Calibration Torque Calibration Dimensional Calibration Pressure Calibration +1 more -
Tescom Calibration Services
Tescom Calibration Services has provided sales, repair, and calibration of telecom test equipment since 1982.
Calibration ServicesFlow Calibration Force Calibration Torque Calibration Mass Calibration Dimensional Calibration +4 more -
Trident Calibration Labs
Serving the greater Phoenix area, Trident Calibration Labs has more than 100 years of combined calibration experience.
Calibration ServicesElectrical Calibration RF & Microwave Calibration Dimensional Calibration Force Calibration Mass Calibration +6 more -
Tru Cal International
Serving as an asset to countless businesses in a variety of industries, Tru Cal International has specialized in test equipment calibration since 1992.
Calibration ServicesElectrical Calibration Dimensional Calibration Force Calibration Pressure Calibration RF & Microwave Calibration +3 more -
Utah Scale Center
Utah Scale Center offers servicing and calibrating of industrial scales across the Rocky Mountain Region, with 70+ years of experience.
Calibration ServicesScale Calibration -
Washington Calibration
Washington Calibration has been providing customers with quality gage repair services for all their inspection measuring instruments for more than 34 years.
Calibration ServicesDimensional Calibration Force Calibration Mass Calibration Pressure Calibration Temperature Calibration +1 more
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Audit-Ready Calibration in 3 Simple Steps
Submit Your Equipment List
Send us a list of the equipment you need calibrated, and we’ll provide a tailored quote with clear pricing—no hidden fees.
Schedule Your Calibration
Choose a convenient time for a mobile or on-site equipment calibration. Our certified technicians ensure precision and compliance with ISO/IEC 17025 standards.
Stay Compliant & Audit-Ready
Receive detailed calibration reports and certification, giving you peace of mind for audits and operational excellence.
Frequently Asked Questions
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What types of flow meters and flow measurement devices can be calibrated?
A wide range of flow measurement devices can be calibrated, including turbine meters, positive displacement meters, mass flow controllers, rotameters, ultrasonic flow meters, and differential pressure-based devices. The appropriate calibration approach depends on the fluid type (liquid or gas), flow range, and the specific measurement technology used.
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How does fluid type affect flow calibration requirements?
Fluid properties such as viscosity, density, temperature, and compressibility all influence how a flow meter behaves. Calibration should ideally be performed using the actual process fluid or a fluid with similar properties, or corrections must be applied. Gas and liquid flow calibrations often follow different standards and use different reference systems, so it is important to communicate your process conditions to your calibration provider.
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What standards are typically used for flow calibration?
Flow calibration standards vary by fluid type and industry. Common references include standards from organizations such as NIST, ISO, and ASME, as well as industry-specific guidelines from sectors like oil and gas, pharmaceutical, and food processing. The applicable standard is typically determined by the regulatory or quality requirements governing your process.
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How can out-of-tolerance flow meters affect my process or product quality?
Inaccurate flow measurement can have significant downstream consequences — including incorrect dosing in pharmaceutical production, improper chemical mixing in industrial processes, billing disputes in custody transfer applications, and regulatory non-compliance in environmental monitoring. Regular calibration helps detect and correct drift before it leads to process errors or costly product quality issues.
