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CalTrak 500 for Gas Flow Calibration

CalTrak 500 Gas Flow Calibrator by Sierra InstrumentsHigh Accuracy Modular Primary Standard Gas Flow Calibrator for Cal Labs & Industry

Sierra’s CalTrak® 500 brining world class accuracy to your flow lab. The CalTrak® 500 is modular piston prover that offers portability and low maintenance for customers who have many flow instruments needing to be validated or calibrated frequently. It comes with a base unit and choice of flow cells fitted with low massborosilicate glass pistons with a low friction coating that oscillate between two detectors to quickly and accurately measure gas flow rates.

The CalTrak® 500 is an accurate primary standard gas flow calibrator for all inert gases. The 500 is used for calibration and verification of:

  • Mass flow meters
  • Controllers
  • Variable area flow meters
  • Precision in-situ calibration of industrial flow meters and controllers


  • Accuracy of up to ± 0.35% of reading gas mass flow rate
  • Calibrate your flow instruments, save money and time
  • Quick, easy to use, automatic data capture 
  • Portable and battery operated
  • Results directly traceable to NIST

Specifications & Downloads
Video Demos

Benefits of the CalTrak 500

  • The performance of only the highest level metrology laboratories can now be yours
  • Accurate primary standard for labs & industry
  • Proven dimensionally-based primary standard accuracy backed by a rigorous uncertainty analysis
  • Manufactured to ISO 17025 Standards at a NVLAP accredited lab
  • Collected data is directly traceable to NIST
  • Surpasses pressure-based secondary methods
  • Everything you need to do your own flow calibration
  • Less expensive than most popular secondary standards
  • Field portable and battery powered
  • Suitable for most non-corrosive gases
  • Accurate and reliable gas flow readings independent of gas species measured
  • Reading options: Single, continuous or burst, with user-selectable averaging from 1 to 100
  • Run automatically in continuous mode or operate manually (one flow reading at a time)
  • Take up to up to 100 measurements in an average continuous mode sequence
  • Easy to use, large LCD readout screen and 23-button keypad
  • Generates calibration certificate easily
  • Communicate via RS-232, USB, and use free CalSoft® software included
  • CalSoft® software automatically acquires flow data for easy data export
  • Kit consists of a base and three interchangeable flow cells
  • Entire kit is packaged in a Pelican case for safe transport
  • Each flow cell has a specific flow range
  • Each flow cell is easily changed (no tools needed) within seconds
  • Flow cells can be purchased separately; Get started with one, add more later
  • Cover a broad set of instrument flow ranges at your facility
  • No Mercury or other hazardous materials
  • Low maintenance  

Industries suitable for use

  • Analytical
  • Life Sciences & Health
  • Custody Trasnfer Billing
  • Biopharmaceutical
  • Life Science
  • Medical Devices

CalTrak 500 Specifications

To view all the specifications for the CalTrak 500 you can download the data sheet here



View the video by Sierra on Primary Standard Gas Flow Calibration Systems

Flow Type: Gas Flow Meters