Fluke Calibration COMPASS for Flow is an advanced mass flow calibration software package designed to automate, manage and document professional gas flow calibration systems. The software combines device-under-test management, automated test execution, real-time flow calculations, flexible macros, data acquisition and comprehensive report generation within a single calibration platform.
COMPASS for Flow is based on the proven COMPASS for Pressure software platform and was developed specifically for the requirements of mass flow calibration.
Unlike the earlier COMPASS for molbox software, COMPASS for Flow is not limited to Fluke Calibration flow references. It natively supports compatible non-Fluke flow references, making it a flexible universal platform for professional mass flow calibration.
References equipped with a supported remote interface can be fully automated. A powerful built-in macro system also allows complex real-time flow calculations to be performed and calibration procedures to react dynamically to measurement results.
The software is particularly suitable for use with Fluke Calibration molbloc/molbox systems and supports current molbox2 technology as well as established molbox1, molbox1+, molbox1+S and molbox RFM systems.
This makes COMPASS for Flow an important software platform for laboratories that want to automate calibration of mass flow controllers, mass flow meters and other gas flow measurement devices while maintaining consistent procedures, structured data and professional calibration reports.
At europascal, COMPASS for Flow complements professional Fluke Calibration gas flow solutions including molbox flow terminals, molbloc flow elements and molstic mounting systems. For professional calibration and metrological traceability, visit the europascal Calibration Service.
Your Benefits at a Glance
The Fluke Calibration COMPASS for Flow software provides extensive tools for creating automated and highly customizable mass flow calibration systems.
Key advantages include:
- Professional mass flow calibration software
- Full calibration test automation
- Current support for molbox2
- Compatible with established molbox systems
- Supports non-Fluke Calibration flow references
- Device Under Test management
- Flexible test procedure setup
- Automated reference data acquisition
- Automated DUT data acquisition
- Real-time flow calculations
- Dynamic modification of test scenarios
- Powerful macro functionality
- Support for custom DUT calculations
- Support for special communication requirements
- Multiple DUT calibration capability
- Gas correction calculations
- Gas density correction calculations
- Pressure and temperature input integration
- Standard and customized report generation
- Flexible calibration data output
- MET/TRACK data export support
- Integration with MFC control hardware
- Single-user and additional-seat licensing
- Windows 7, 8, 10 and 11 support
- Suitable for manual, semi-automated and fully automated laboratories
Complete Mass Flow Calibration Software
Fluke Calibration COMPASS for Flow provides the tools required to configure, execute and document mass flow calibration procedures.
A calibration system can include:
Flow Reference + Flow Control + Device Under Test + COMPASS for Flow
Depending on the system configuration, the software can communicate with the reference standard, device under test and associated control equipment.
COMPASS then coordinates the individual devices according to the defined calibration procedure.
The result is a reproducible calibration process that reduces manual intervention and improves laboratory productivity.
Current molbox2 Support
An important feature for modern Fluke Calibration flow systems is support for:
Fluke Calibration molbox2.
Fluke updated COMPASS for Flow to provide molbox2 compatibility.
This allows the current generation of molbloc/molbox gas flow calibration systems to be integrated into automated calibration benches using the established COMPASS software environment.
For laboratories upgrading from molbox1+ to molbox2, this provides continuity in test automation, report generation and long-term result tracking.
Compatible Fluke Calibration Flow Systems
COMPASS for Flow supports a broad range of Fluke Calibration flow equipment.
Supported systems include:
- molbox2
- molbox1
- molbox1+
- molbox1+S
- molbox RFM
- MFC-CB
- MFC Switchbox
This compatibility is particularly useful for laboratories operating both newer and legacy Fluke Calibration flow equipment.
Existing calibration procedures can therefore remain relevant when parts of the reference system are upgraded.
molbox2 and COMPASS for Flow
A modern automated Fluke Calibration gas flow system can combine:
molbox2 + molbloc + COMPASS for Flow
The molbloc provides the characterized reference flow element.
The molbox2 measures the relevant pressure and temperature parameters and calculates the reference flow.
COMPASS for Flow coordinates the calibration procedure and handles:
- Test setup
- Reference communication
- DUT communication
- Measurement acquisition
- Flow point sequencing
- Calculations
- Data storage
- Result processing
- Report generation
This creates a powerful automated gas flow calibration platform.
molbloc-L Applications
COMPASS for Flow can be used with molbox systems equipped with:
molbloc-L laminar flow elements.
The molbloc-L family covers gas flow rates from approximately 1 sccm to 100 slm depending on the selected element, gas and operating conditions.
COMPASS does not replace the molbloc or molbox measurement functions.
Instead, it automates and manages the complete calibration procedure around the reference system.
molbloc-S Applications
The software can also be used with molbox systems equipped with:
molbloc-S sonic nozzle flow elements.
These flow elements extend the molbloc/molbox system into substantially higher gas flow ranges.
COMPASS for Flow can therefore automate calibration procedures across a very broad range of gas mass flows when the appropriate reference hardware is available.
Support for Non-Fluke Flow References
One of the most important differences between COMPASS for Flow and the older COMPASS for molbox software is support for:
non-Fluke Calibration flow references.
This turns COMPASS for Flow into a more universal mass flow calibration software platform.
A compatible reference equipped with a supported remote interface can be incorporated into an automated calibration system.
This provides laboratories with greater flexibility when combining different manufacturers’ equipment.
Device Under Test Management
Fluke Calibration COMPASS for Flow includes tools for defining and managing devices under test.
A DUT record can contain information required for the calibration procedure.
This enables standardized procedures to be associated with specific instruments or instrument types.
Typical devices under test include:
- Mass flow controllers
- Mass flow meters
- Thermal mass flow meters
- Rotameters
- Variable-area flow meters
- Turbine flow meters
- Bubble flow meters
- Gas flow sensors
- Process flow meters
Structured DUT management improves consistency when instruments are calibrated repeatedly.
Test Setup
COMPASS for Flow provides dedicated tools for creating test setups.
The test setup defines how the calibration should be performed.
Depending on the application, this can include:
- Reference instrument
- Device under test
- Calibration points
- Flow units
- Gas
- Flow control
- Stabilization requirements
- Measurement sequence
- Data acquisition
- Calculations
- Result processing
Once configured, the procedure can be reused for subsequent calibrations.
Automated Calibration Procedures
References with supported remote interfaces can be fully automated by Fluke Calibration COMPASS for Flow.
During a calibration, the software can coordinate the reference and DUT according to the predefined procedure.
A typical automated sequence can include:
Select test point → Establish flow → Stabilize → Read reference → Read DUT → Calculate result → Store data → Continue to next point
This reduces repetitive manual operations.
Automation can also help ensure that the same procedure is followed consistently for every calibration.
Real-Time Flow Calculations
COMPASS for Flow includes powerful real-time calculation capabilities.
Measurement data can be processed while the calibration is running.
This is particularly useful for gas flow calibration because measured flow values can depend on additional parameters such as:
- Gas type
- Pressure
- Temperature
- Reference conditions
- Device correction factors
The software can use these inputs to calculate corrected values during the test.
Gas Correction Factors
Mass flow devices are frequently calibrated for gases that differ from their original calibration gas.
COMPASS for Flow supports:
mass flow device gas correction factors.
These correction factors can be incorporated into the calibration procedure.
This is particularly useful for thermal mass flow controllers and mass flow meters whose indication can depend on gas properties.
Gas Density Corrections
Volumetric flow devices can require gas density corrections when operating conditions differ from their specified reference conditions.
COMPASS for Flow supports gas density corrections for devices such as:
rotameters and other volumetric flow meters.
Pressure and temperature measurements can be entered automatically and used to dynamically calculate the corrected flow.
This makes the software particularly useful for calibration systems where the operating gas conditions vary during a test.
Pressure and Temperature Inputs
Gas flow calculations frequently require accurate pressure and temperature information.
COMPASS for Flow can incorporate automatically acquired pressure and temperature measurements into its calculations.
These values can be used for:
- Gas density corrections
- Flow corrections
- DUT corrections
- Reference condition conversion
- Custom calculations
This reduces the need for manual data entry and helps create a fully integrated calibration process.
Powerful Macro Functionality
One of the major strengths of Fluke Calibration COMPASS for Flow is its built-in macro capability.
Macros allow calibration procedures to be customized far beyond a simple fixed measurement sequence.
They can be used for:
- Custom calculations
- Automated decision making
- Device communication
- Additional instrument control
- Data processing
- Conditional test sequences
- Special calibration requirements
Fluke describes the macro capability as providing support for nearly unlimited test system automation.
Dynamic Test Scenarios
The macro system allows COMPASS for Flow to modify the test scenario based on data collected during the calibration.
For example, a procedure can respond to a measurement result rather than simply continuing through a fixed sequence.
This capability can be useful for:
- Automatically repeating unstable measurements
- Changing a test sequence
- Applying conditional calculations
- Adjusting calibration points
- Reacting to DUT behavior
- Implementing laboratory-specific procedures
This provides significantly more flexibility than a simple data acquisition program.
Custom DUT Calculations
Some flow instruments do not provide an output that can be compared directly with the reference.
COMPASS for Flow provides enhanced support for DUTs requiring:
custom calculations on output indications.
The raw DUT output can therefore be converted into the required engineering quantity before comparison with the reference.
This can be especially useful for:
- Analog voltage outputs
- Analog current outputs
- Frequency outputs
- Manufacturer-specific digital values
- Corrected flow indications
Special Communication Support
Modern flow calibration laboratories often contain instruments from different manufacturers using different communication protocols.
COMPASS for Flow provides flexible support for DUTs requiring special communication.
Combined with macros, this allows the software to interact with instruments that require more complex communication sequences.
This expands the range of equipment that can be integrated into an automated calibration bench.
Calibration of Multiple Devices
COMPASS for Flow includes enhanced support for:
calibrating multiple devices simultaneously.
This can significantly increase calibration throughput when several compatible flow instruments need to be tested under the same flow conditions.
Rather than running a complete calibration sequence separately for every instrument, multiple DUTs can be incorporated into a suitable automated system.
This is particularly attractive for production environments and high-throughput calibration laboratories.
MFC Calibration
Fluke Calibration COMPASS for Flow is particularly suitable for automated mass flow controller calibration.
A typical system can combine:
Gas Supply + Flow Reference + MFC Control Hardware + MFC Under Test + COMPASS for Flow
The software can coordinate the required test points and collect reference and DUT values.
Depending on the connected hardware, it can also automate flow control and MFC setpoint generation.
MFC-CB Support
COMPASS for Flow provides flexible support for the:
Fluke Calibration MFC-CB Control Box.
The MFC-CB is used for setting and reading analog mass flow controllers.
Integrating this hardware with COMPASS allows the software to coordinate MFC control with reference flow measurements.
This helps create a complete automated MFC calibration workstation.
MFC Switchbox Support
The software also supports the:
Fluke Calibration MFC Switchbox.
This accessory is particularly useful when several mass flow controllers are connected to one calibration system.
Together with COMPASS for Flow, it can support automated multi-device calibration configurations.
Automated Data Acquisition
During a calibration, COMPASS for Flow can automatically collect data from the connected reference and DUT.
This minimizes manual transcription.
Automated acquisition provides several benefits:
- Reduced operator workload
- Reduced transcription errors
- Consistent data formatting
- Improved traceability
- Faster calibration procedures
- Easier result processing
All relevant calibration data can then be used for calculations and reporting.
Calibration Report Generation
COMPASS for Flow provides comprehensive tools for generating calibration reports.
Both standard and customized reports can be created.
This allows the report format to be adapted to laboratory requirements.
Report generation is integrated with the test and data management functions, reducing the need to manually transfer results into separate reporting software.
Flexible Data Output
COMPASS for Flow provides flexible data output options.
Collected data can be transferred to higher-level applications.
This allows the specialized flow calibration functions of COMPASS to remain integrated with an organization’s broader calibration or quality management environment.
The software therefore does not have to operate as an isolated system.
MET/TRACK Data Export
COMPASS for Flow includes the ability to export data to:
Fluke MET/TRACK.
This allows flow calibration data to be transferred into a broader calibration asset management environment.
For laboratories using MET/TRACK, this provides a useful connection between specialized flow calibration automation and overall calibration management.
Test Result Tracking
COMPASS for Flow can also be used to maintain consistent test records over time.
This allows laboratories to compare calibration results from repeated tests and follow the performance of instruments over successive calibration intervals.
When used with current molbox2 systems, Fluke specifically identifies COMPASS for Flow as the software solution for:
- Test automation
- Report generation
- Tracking results over time
Manual and Automated Workflows
The software does not require every calibration system to be completely automated.
COMPASS for Flow can also support systems in which some operations are performed manually.
This allows laboratories to introduce automation gradually.
A calibration bench can therefore evolve from a manually controlled system to a highly automated system while retaining the same basic COMPASS software environment.
Windows Compatibility
Fluke currently specifies the minimum computer requirement as a PC running:
- Windows 7
- Windows 8
- Windows 10
- Windows 11
Both:
32-bit and 64-bit
versions are supported according to the current Fluke product information.
This allows COMPASS for Flow to operate on a broad range of laboratory PCs.
Current Software Version
The current Fluke Calibration software download identifies:
COMPASS for Flow Version 5.3.0.
This release was published in September 2025.
Important updates include:
- Added molbox2 support to molTools
- Added molbox2 support to COMPASS
- Improvements related to molbox AUTOZ recognition
- Correction of a molbox RFM runtime issue
- Expanded molTools serial number field
The addition of molbox2 support is particularly important for laboratories upgrading from older molbox generations.
Single User License
Fluke offers:
COMPASS-F-ENH-SNGL
COMPASS for Flow Enhanced Single User.
The Single User version includes one software license and is required for an initial stand-alone installation.
It provides the foundation for a COMPASS for Flow installation.
Additional Seat License
For additional users accessing the same COMPASS database, Fluke offers:
COMPASS-F-ENH-L
COMPASS for Flow Enhanced Additional Seat License.
This allows the software environment to be expanded beyond a single workstation where required.
The appropriate licensing configuration depends on the laboratory’s number of users and workstations.
COMPASS for Flow vs. COMPASS for molbox
The earlier:
COMPASS for molbox
was specifically focused on Fluke Calibration molbloc/molbox systems.
The newer:
COMPASS for Flow
provides a more universal platform.
A major difference is native support for:
non-Fluke Calibration flow references.
COMPASS for Flow also adds functionality originally developed for COMPASS for Pressure, including:
- MET/TRACK data export
- Enhanced custom DUT calculations
- Special communications support
- Multiple DUT calibration
- Powerful macro functionality
- More flexible accessory integration
This makes COMPASS for Flow significantly more adaptable to complex calibration systems.
COMPASS for Flow with molbox1+
COMPASS for Flow supports established:
Fluke Calibration molbox1+
systems.
This allows existing calibration laboratories to continue using automated procedures with their installed molbox1+ hardware.
It also provides continuity when transitioning from molbox1+ to the newer molbox2 platform.
COMPASS for Flow with molbox RFM
Legacy:
Fluke Calibration molbox RFM
systems are also supported.
This is useful for laboratories that continue to operate older molbloc/molbox reference systems.
Current COMPASS software therefore provides a bridge between several generations of Fluke Calibration flow hardware.
COMPASS for Flow with molbox2
For new molbloc/molbox systems, COMPASS for Flow can be combined with:
Fluke Calibration molbox2.
Fluke has updated the software specifically to support molbox2.
This combination provides current Fluke Calibration hardware together with established COMPASS automation, reporting and result-tracking capabilities.
A modern system can therefore combine:
molbox2 + molbloc-L or molbloc-S + molstic + COMPASS for Flow
to create a complete professional gas flow calibration workstation.
Technical Highlights
| Feature | Fluke Calibration COMPASS for Flow |
|---|---|
| Product type | Mass Flow Calibration Software |
| Application | Gas flow calibration automation |
| Current version | 5.3.0 |
| molbox2 support | Yes |
| molbox1 support | Yes |
| molbox1+ support | Yes |
| molbox1+S support | Yes |
| molbox RFM support | Yes |
| Non-Fluke references | Supported |
| Remote automation | Yes, with supported interfaces |
| Real-time calculations | Yes |
| Macro capability | Yes |
| Dynamic test scenarios | Yes |
| DUT management | Yes |
| Test procedure management | Yes |
| Multiple DUT support | Yes |
| MFC-CB support | Yes |
| MFC Switchbox support | Yes |
| Report generation | Standard and customized |
| MET/TRACK export | Supported |
| Windows 7 | Supported |
| Windows 8 | Supported |
| Windows 10 | Supported |
| Windows 11 | Supported |
| 32-bit / 64-bit | Supported |
| Single-user license | COMPASS-F-ENH-SNGL |
| Additional seat | COMPASS-F-ENH-L |
Typical Applications
Fluke Calibration COMPASS for Flow is suitable for:
- Automated gas flow calibration
- Mass flow controller calibration
- Mass flow meter calibration
- Thermal mass flow meter calibration
- Rotameter calibration
- Variable-area flow meter calibration
- Gas flow sensor calibration
- Process flow meter calibration
- Multi-device calibration
- Automated molbox2 calibration systems
- molbox1+ calibration systems
- Legacy molbox RFM systems
- Semiconductor manufacturing
- Pharmaceutical applications
- Environmental monitoring
- Research and development
- Calibration laboratories
- Production calibration
- Gas flow metrology
Why Choose Fluke Calibration COMPASS for Flow?
Fluke Calibration COMPASS for Flow provides a flexible software platform for automating professional mass flow calibration systems.
Unlike software designed exclusively for one specific reference instrument, COMPASS for Flow can work with Fluke Calibration molbox systems as well as compatible non-Fluke flow references.
Powerful macro functionality enables complex real-time calculations, custom communications and dynamic test procedures that can react to the measurement data collected during a calibration.
Integrated DUT management, test setup, automated data acquisition and report generation create a structured workflow from initial calibration configuration through to final documentation.
Support for gas correction factors, density corrections and automatic pressure and temperature inputs makes the software particularly suitable for the specific requirements of gas flow calibration.
The current software generation also supports Fluke Calibration molbox2, providing a modern automation platform for current molbloc/molbox calibration systems while maintaining compatibility with established molbox1, molbox1+, molbox1+S and molbox RFM equipment.
For high-throughput applications, support for multiple DUTs, MFC-CB and MFC Switchbox hardware enables sophisticated automated mass flow controller calibration systems.
COMPASS for Flow therefore provides a scalable solution ranging from individual laboratory calibration procedures to complex automated gas flow calibration workstations.
At europascal, we provide Fluke Calibration flow, pressure, temperature and electrical calibration technology for professional laboratory and industrial applications.
For professional calibration and metrological traceability, visit the europascal Calibration Service.
Further products from Fluke Calibration are available from europascal.
Manufacturer information about Fluke Calibration COMPASS for Flow is available on the official Fluke Calibration website.
