Sierra Instruments, Inc.

SierraModel CalTrak XL -Primary Standard High-Flow Gas Flow Calibrator

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The CalTrak XL is the leading high-flow primary standard calibrator on the market today. The XL is used for calibration and verification of mass flow meters, controllers, variable area flow meters, and precision in-situ calibration of industrial flow meters and controllers. With increased demand for higher flows of process gas, there is a heavy demand to validate and calibrate high flow gas meters and controllers.  The cost to use third-party calibration houses to calibrate and certify higher flow devices is three to four times the cost of an ordinary low flow device up to 50 slpm.

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  • Begin to calibrate up to 1500 slpm
  • Replace bell provers or sonic nozzle arrays
  • Bring ± 0.15% of reading accuracy to the factory floor
  • Quick, easy-to-use, automatic data capture 
  • Results directly traceable to NIST

The CalTrak XL:

  • Is an ideal choice for owners and users of many instruments (more than 25) that require calibration/verification one or more times a year
  • Has a wide calibration, so a single XL system will accurately calibrate so-called low flow devices from 15 slpm, as well as much higher flow devices up to 1500 slpm
  • Is manufactured to ISO 17025 standards at an NVLAP-accredited lab using assets that are directly traceable to NIST

In addition, the dimensionally-based primary accuracy of the XL surpasses pressure-based secondary methods and is backed by a rigorous uncertainty analysis.

All of our CalTrak models contain a nearly frictionless graphite piston that moves freely inside a borosilicate glass tube. When the parallel bypass valve is closed, the gas flow is directed into the tube to push the piston up. Two photo-optic sensors detect the piston as it travels past.

The distance the piston travels between the two sensors is precisely defined and represents a known volume. Accurate crystal-based timers drive a microprocessor which calculates the rate of rise. This defines the volumetric flow rate.  At the same time, extremely accurate temperature and absolute pressure sensors collect data used to calculate the mass flow rate.

  • The performance of only the highest level metrology laboratories can now be yours
  • Accurate high flow primary standard for labs & industry
  • Less expensive than bell provers, sonic nozzle arrays and popular secondary standards
  • Flexible all-in-one multiple cells eliminates switching cells
  • Proven dimensionally-based primary standard accuracy backed by a rigorous uncertainty analysis
  • Manufactured to ISO 17025 standards at an NVLAP-accredited lab
  • Cover a broad set of instrument flow ranges at your facility
  • Collected data is directly traceable to NIST
  • Surpasses pressure-based secondary methods
  • Everything you need to do your own flow calibration
  • 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
  • No mercury or other hazardous materials
  • Low maintenance
  • All clean gases, non-corrosive, humidity less than 70% non-condensing
  • Mass and volumetric flow rate
  • Accuracy by flow range:  5 to 500 slpm*
    • Volumetric: ±0.25% of reading
    • Mass: ±0.25% of reading*
  • Accuracy by flow range: 15 slpm to 1500 slpm*
    • Volumetric: ±0.45% of reading
    • Mass: ± 0.45% of reading*
  • For lower flows, see the CalTrak 800 flows down to 0.5 sccm*
  • Flow mode: Pressure or suction
  • Operating temperature: 15°C to 30°C (59°F to 81°F)
  • Ambient temperature: 0°C to 70°C (32°F to 158°F)
  • Operating pressure:
    • 19.5 psia (1344 mbarA) maximum pressure
  • Pressure accuracy: 0.05% full scale

    *Note: At gas pressure of 760 mmHg, (1 atm ) and a gas temperature of 77°F (25°C) with standardization temperature set to 69.98°F (21.1°C)
  • All clean gases, non-corrosive, humidity less than 70% non-condensing
  • Mass and volumetric flow rate
  • Accuracy by flow range:  5 to 500 slpm*
    • Volumetric: ±0.25% of reading
    • Mass: ±0.25% of reading*
  • Accuracy by flow range: 15 slpm to 1500 slpm*
    • Volumetric: ±0.45% of reading
    • Mass: ± 0.45% of reading*
  • For lower flows, see the CalTrak 800 flows down to 0.5 sccm*
  • Flow mode: Pressure or suction
  • Operating temperature: 15°C to 30°C (59°F to 81°F)
  • Ambient temperature: 0°C to 70°C (32°F to 158°F)
  • Operating pressure:
    • 19.5 psia (1344 mbarA) maximum pressure
  • Pressure accuracy: 0.05% full scale

    *Note: At gas pressure of 760 mmHg, (1 atm ) and a gas temperature of 77°F (25°C) with standardization temperature set to 69.98°F (21.1°C)