Primary Standard Liquid Flow Calibrators

The Liquid Flow Calibrator (LFC) line is a new generation of state-of-the-art, primary standard, positive displacement, liquid flow calibrators. The vastly improved design is available in four sizes, a maximum flow of 1 GPM, 10 GPM, 60 GPM, and 400 GPM. Total System Uncertainty is +/- 0.05% (k=2) or better. Typically 0.02% is realizable.  These flowmeter calibrators are compatible with all turbine meters, frequency output flowmeters, analog output flowmeters, and variable area (rotameter) flowmeters. These flow calibrators are the most advanced available. Just ask the American military.

The innovations include:

    • Improved start flowrate profile
    • Standardized electronics
    • Flow direction indication
    • Drain pan movable work surface
    • Barrel or drain pan filling using a vacuum control system
    • Simple drain connections
    • Manual (hand) or automatic (computer) operation
    • Test section isolation valves
    • Modern slider-section
    • Stacked pick-off amplifiers to avoid multi-channel cross-talk
    • Large air plenum to avoid pressure dips,
    • Service-minded layout for ease of maintenance
    • Easy filter replacement,
    • Easy access to temperature probes for quick calibration
    • Stacked and easy access throttling valve system
    • Easy access operator control panel
    • Fluid draw plumbing attachment
    • Easy improved air-bleed system,
    • and all of the features of the advanced Windows flow calibrations software, CFlow+


  • Optional features:
    • Temperature control (+/- 1/2 degree F) with easy to remove insulation blankets
    • Class 1, Division II NEC protection for hazardous environments

    Want to see one of these advanced flow calibrators? Depending on your location we can arrange a visit to a flowmeter calibration lab near you.

CFP-400-Compuflow Solutions


The CFP-400 flow calibrator was developed for the U.S. Air Force. With a flowrate of 0.2–400 GPM, this primary standard is meant for flowmeters in the 2” diameter range.


The CFP-060 flow calibrator was developed for the U.S. Army. With a flowrate of 0.03–60 GPM, this primary standard calibrator is meant for flowmeters in the 1” diameter range.

CFP-101-Compuflow Solutions


The CFP-010 flow calibrator was developed for the U.S. Air Force.  With a flowrate of 0.005–10 GPM, this primary standard calibrator is meant for flowmeters in the 1/2” diameter range.

CFP-001-Compuflow Solutions


The CFP-001 flow calibrator was developed for the U.S. Army. The special standard has a flowrate of 0.001–1.0 GPM. It is meant for ultra-low rate flowmeters, that no other primary standard can reach.  The novel design does not use the classical piston, as the flowtube would be too small.

Secondary Standard Liquid Flow Calibrators

CLF-250-Compuflow Solutions


Developed for the U.S. Army, the Liquid Flow Working Standard (LFWS) is a self-contained flow loop calibration system. It consists of closed loop pump capable of developing from 0-250 GPM with simple motor speed control. The fluid is run in a folded line to form a double test section for large master meters and test meters. The system is capable of temperature and pressure control. The computer system uses our Windows Flow Calibration software (CFlow+) to measure the flowrate from the user supplied master meter and compare that to the signal developed by the user’s test meters. Uncertainty is dependent on the user’s choice of master meters. The system includes detailed diagnostic procedures, complete documentation, and on-site installation and training. Custom configurations are available.

CFL-100HP-Compuflow Solutions


This special variant of the flow loop was designed for the U.S. Army to do flow calibration and high pressure static testing of special 100 cSt hydraulic fluid up to 100 GPM, requiring an extra powerful pump and cooling system.

8-Channel-Flow-Compuflow Solutions

Eight Channel Flow Transfer Standard

This device designed for the U.S. Army as a combination instrument meant to serve as an eight channel flow computer and a flow transfer standard (FTS). The software package, Lysis reads up to eight independent flow meter channels from the device and displays all flowrate information. Another version of CFlow+ is used to operate the device as a secondary flow standard where flowmeters are used to calibrate other flowmeters.

Gas Calibrators

CFSNC-250-Compuflow Solutions
CFSNC-250.1-Compuflow Solutions

CFSNC-250 (Sonic Gas Flow Calibrator)

Developed for the U.S. Air Force, the Sonic Gas Flow Calibrator (SGFC) is a sonic nozzle flow calibration system. It consists of twelve, binary sized sonic nozzles in two manifolds that conform to ISO-9300. The system (in the base configuration) will develop 0.1–250 SCFM (3-7080 SLPM) from 20–110 PSIA, with a total system uncertainty of +/- 0.35% (k=2). The operator, under computer control, may select a single nozzle or any combination of nozzles to develop the desired flowrate manually, or may give total control to the computer’s advanced algorithm that precisely selects the correct nozzle combination and inlet pressure to obtain the desired flowrate. The operator may even select a series of desired flowrates and allow the computer to calibrate the device under test without operator intervention. The nozzle manifolds can easily be removed for service and calibration. The system includes manifold carrying cases, detailed diagnostic procedures, user defined programmable test language, complete documentation, and on-site installation and training.