Sierra Instruments, Inc.

- Model XL - Primary Standard High-Flow Gas Flow Calibration



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.

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.

  • 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: ±0.30% of reading
    • Mass: ± 0.30% 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

  • AC power adapter:
    • Input: 100-240 VAC, 1.6A (max), 50-60 Hz
    • Output: 12 VDC, 3.0A
  • Dimensions:
    • Height:  34 inches (86.3 cm)
      Width: 30 inches (76.2 cm)
      Depth: 12 inches (30.0 cm)
  • Weight:
    • 41 Kg (91 lbs)
  • CE approved
  • RoHS compliant
  • Digital communications: RS232 port and serial cable

CalTrak XL is a true primary standard in every sense of the word, because its accuracy is based upon primary SI units: The interior diameter of the glass measuring cylinder; the length of piston travel within the cylinder; and the time it takes the piston to travel this distance, implying a known volume. Our patented technology, therefore, offers accuracies at the level of national laboratories in one portable device.

Sierra’s 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 micro-processor 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.

Standardized Accuracy*
+/- 0.25% of reading 15°C to 30°C (59°F to 86°F), from 5 slpm to 500 slpm
+/- 0.45% of reading 15°C to 30°C (59°F to 86°F), from 15 slpm to 1500 slpm
*Note: Volumetric accuracy (lpm) is the same

Time per Measurement
5 to 100 seconds (approximate)

Single, continuous or burst, with averaging function user-selectable from 1 to 100

Flow Ranges
5 splm to 500 slpm*
15 slpm to 1500 slpm*

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

Gas Compatibility
Non-corrosive, non-combustible gases, less than 70% humidity, non-condensing

Operating Pressure (Absolute)
XL 500L: 10–19.5 psia
XL 1500: 14–45 psia
Pressure Accuracy: 0.05% full scale

Operating Temperature
15°C to 30°C (59°F to 86°F)
Temperature accuracy +/- 0.2% full scale

Ambient Humidity
0–70%, non-condensing

Storage Temperature
0°C to 70°C (32°F to 158°F)

Flow Modes
Pressure or suction

Pressure & Suction Fittings
1 1/2-inch Swagelok® compression tube fitting Reducing fittings are available for 1 inch, 3/4 inch and 1/2 inch connections (as detailed in our price list)

Flow Units
Volumetric: L/min, cf/min, mL/min
Flow: smL/min, scf/min, slpm

1 year; battery 6 months

CE RoHS compliant

Digital Communication
RS-232 port and serial cable

Backlit graphical LCD

Height: 34 inches (863.6mm)
Width: 32 inches (812.8 mm)
Depth: 12 inches (304.8 mm)

90 lbs (41 kg)

Integrated flow measuring cell, valve and timing mechanism

Backlit graphical LCD

AC Power Adapter/Charger
External power module
Input: 100-240 VAC, 1.6A (max), 50-60 Hz
Output: 12 VDC, 3.0A

Local Interface
Backlit LCD graphical display; Four directional arrow buttons on the control panel allow you to navigate through the menu; user selectable flow units plus time intervals

CalSoft™ Software
Software System Requirements
Windows® XP, Windows® 7
Microsoft Excel® 2003 and up

  • Captures flow data from your CalTrak instrument for easy export into common software packages, a PC, or Microsoft enviornment.
  • Real-time data monitoring
  • Upload the latest version of the firmware to your CalTrak
  • Enter flow rates from pumps or other flow source or flow meters and calibrate the flow source.
  • Compare the flow measurements from your CalTrak precision calibrator.

Mass Flow Controllers
Sierra’s popular SmartTrak® 100 Series Mass Flow Controllers are ideal for generating and maintaining a constant flow of gas so that any type of flow meter can easily be calibrated. Special versions of the SmartTrak are available to cover the range of each CalTrak flow cell. With the builtin display and controls, SmartTrak is a complete gas flow generation system.

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