Fluke Calibration molstic-L is a modular flow mounting system designed specifically for professional use with Fluke Calibration molbloc-L laminar mass flow elements. It provides an engineered mechanical and pneumatic platform for mounting the molbloc, connecting the gas supply, regulating operating pressure and integrating a mass flow controller or other device under test into a complete gas flow calibration system.
The molstic-L is not itself a gas flow reference or flow measuring instrument. Instead, it provides the infrastructure required to operate molbloc-L flow elements under stable and reproducible pneumatic conditions. Combined with a molbloc-L and a compatible molbox flow terminal, the molstic-L becomes an important part of a highly accurate gas mass flow calibration system.
Fluke Calibration offers molstic-L systems in Low Flow, Mid Flow and High Flow configurations. Single-channel versions accommodate one molbloc-L, while Dual versions allow two molbloc-L elements to remain installed simultaneously. This enables calibration laboratories to cover different flow ranges without repeatedly changing the flow hardware.
The integrated components include a gas supply quick connector, precision filtration, adjustable pressure regulation, a bellows shut-off valve and dedicated molbloc mounting cradles. Downstream connections provide a convenient location for installing a mass flow controller, another device under test or an optional precision metering valve for manual flow control.
At europascal, the Fluke Calibration molstic-L complements a comprehensive range of professional flow calibration equipment including molbloc-L flow elements and molbox flow terminals. For professional calibration and metrological traceability, visit the europascal Calibration Service.
Your Benefits at a Glance
The Fluke Calibration molstic-L provides a professional and reproducible platform for building molbloc-L gas flow calibration systems.
Key advantages include:
- Designed specifically for molbloc-L laminar flow elements
- Professional mechanical and pneumatic mounting platform
- Low Flow, Mid Flow and High Flow versions
- Single and Dual configurations available
- Quick connector for gas supply
- Integrated precision filtration
- 2 micron filter in standard configurations
- 0.5 micron filter for Low Flow systems
- Adjustable upstream pressure regulator
- Protection against accidental molbox transducer overpressure
- Bellows shut-off valve
- Dedicated molbloc mounting cradles
- Downstream connection for the device under test
- Suitable for mass flow controllers
- Optional precision metering valves
- Manual flow control possible
- Dual versions accommodate two molbloc-L elements
- Compact integrated design
- Optimized for molbloc/molbox systems
- Suitable for manual and automated calibration systems
Designed for molbloc-L Laminar Flow Elements
The Fluke Calibration molstic-L has been developed specifically for Fluke Calibration molbloc-L mass flow elements.
A typical calibration system consists of:
Gas Supply + molstic-L + molbloc-L + molbox Flow Terminal + Device Under Test
Each component has a clearly defined function.
The molbloc-L is the characterized laminar flow element.
The molbox performs the required pressure and temperature measurements and calculates the corresponding reference gas mass flow.
The molstic-L provides the mechanical mounting, gas conditioning, pressure regulation, isolation and pneumatic connections required to operate the complete system.
This modular architecture allows the individual components to be selected according to the required gas flow range and calibration application.
Integrated Gas Supply Connection
The Fluke Calibration molstic-L provides a quick connector input for convenient connection to the calibration gas supply.
This provides a standardized starting point for the complete pneumatic system.
After entering the molstic-L, the calibration gas passes through the integrated filtration and pressure regulation stages before reaching the molbloc-L.
This integrated arrangement helps create reproducible operating conditions and reduces the need to assemble the calibration system from separate pneumatic components.
Integrated Precision Filtration
Clean calibration gas is particularly important when using molbloc-L laminar flow elements.
The precision flow path of a molbloc-L consists of a narrow annular gap between a piston and a closely fitted cylindrical bore. Contamination of this flow path could change its flow characteristics.
The Fluke Calibration molstic-L therefore incorporates filtration upstream of the molbloc.
Standard configurations use a:
2 micron filter.
Low Flow molstic-L systems use an even finer:
0.5 micron filter.
This helps protect downstream components and the molbloc-L against particulate contamination.
Clean, dry calibration gas should nevertheless always be used to maintain optimum long-term performance.
Integrated Pressure Regulation
After the filter, the Fluke Calibration molstic-L uses an adjustable pressure regulator.
The regulator performs two important functions.
First, it establishes and maintains the optimum upstream operating pressure for the connected molbloc-L.
Second, it helps protect the pressure transducers in the connected molbox against accidental overpressure.
The regulator range is designed to support the standard molbloc operating pressure ranges.
Stable upstream pressure is particularly important for achieving reproducible gas flow conditions during calibration.
Bellows Shut-Off Valve
A bellows shut-off valve is positioned immediately upstream of the molbloc-L.
This allows the operator to isolate the gas supply when required.
Typical applications include:
- Changing the system configuration
- Replacing a molbloc-L
- Connecting another device under test
- Performing leak checks
- Isolating the flow system
- Preparing the calibration bench for maintenance
The integrated valve simplifies these procedures and reduces the need for additional external isolation components.
Dedicated molbloc-L Mounting Cradles
Special mounting cradles support the molbloc-L elements.
These cradles provide stable and repeatable mechanical positioning of the flow elements.
A professional mounting system is particularly important because the molbloc-L must be connected simultaneously to the gas circuit and to the corresponding molbox measurement connections.
The molstic-L keeps these components organized within a compact calibration platform.
Device Under Test Connection
Downstream of the molbloc-L, the molstic-L provides a connection and mounting area for the device under test.
Typical devices include:
- Mass flow controllers
- Mass flow meters
- Thermal mass flow meters
- Rotameters
- Variable-area flow meters
- Gas flow sensors
- Process flow meters
The dedicated mounting area simplifies the connection of the DUT to the reference flow system.
An optional metering valve can be installed instead when manual flow control is required.
Calibration of Mass Flow Controllers
The Fluke Calibration molstic-L is particularly suitable for building calibration systems for mass flow controllers.
A typical system can be arranged as:
Gas Supply → molstic-L Pressure Regulation → molbloc-L → MFC Under Test
The molbloc-L provides the characterized laminar flow element.
The molbox determines the reference mass flow from the pressure and temperature measurements and the individual molbloc calibration data.
The reference flow is then compared with the setpoint, indication or output signal of the mass flow controller.
The integrated molstic-L components provide a clean and repeatable pneumatic configuration for this calibration process.
Optional Metering Valve
For devices that do not actively control the gas flow, Fluke Calibration offers optional metering valves for the molstic-L.
These allow the operator to manually adjust the gas flow through the system.
Separate metering valve versions are available for:
Low Flow
and:
Mid / High Flow
applications.
This allows the flow adjustment component to be matched to the required flow range.
Fine manual adjustment is particularly useful when specific calibration points must be established for passive gas flow meters.
Single molstic-L
Single-channel Fluke Calibration molstic-L systems accommodate one molbloc-L.
This configuration is suitable when:
- One primary flow range is required
- molbloc changes are infrequent
- A compact calibration platform is preferred
- The application is dedicated to a specific DUT range
Fluke currently lists Single configurations for Low Flow, Mid Flow and High Flow applications.
The Single system provides a straightforward solution for dedicated gas flow calibration benches.
Dual molstic-L
Dual-channel Fluke Calibration molstic-L systems allow two molbloc-L elements to remain installed simultaneously.
This offers important advantages when a calibration laboratory must regularly work across different flow ranges.
Instead of removing one molbloc and installing another, two different molbloc-L ranges can remain connected to the calibration platform.
The operator can therefore switch between the available ranges with significantly less hardware reconfiguration.
Dual configurations are available for Low Flow and Mid Flow applications.
Two molbloc-L Elements for Wider Range Coverage
The Dual molstic-L is particularly useful when two different molbloc-L sizes are combined.
For example, one molbloc can be selected for low flows and another for higher flows.
Together they can provide substantially broader flow coverage than a single molbloc.
This modular concept is particularly valuable because the molbloc-L family covers gas flows from approximately:
1 sccm to 100 slm
depending on the selected flow element, gas and operating pressure.
The molstic-L therefore provides the physical platform required to make efficient use of the modular molbloc concept.
Low Flow molstic-L
The Low Flow molstic-L is optimized for very low gas flow applications.
Fluke uses a special high-stability pressure regulator and minimizes internal dead volume.
This is important because pressure instability and unnecessary internal volume can have a significant influence when operating at very low gas flow rates.
Low Flow molstic-L systems are required for effective use with:
2E2-L and lower molbloc-L elements.
They can also be used with molbloc-L elements up to:
1E3-L.
The Low Flow configuration also uses the finer 0.5 micron filter.
Mid Flow molstic-L
The Mid Flow molstic-L covers a particularly broad selection of molbloc-L elements.
Fluke specifies Mid Flow configurations for molblocs ranging from approximately:
2E2-L
through:
3E4-L.
This makes the Mid Flow molstic-L a versatile solution for many common laboratory gas flow calibration applications.
Single and Dual versions are available.
High Flow molstic-L
The High Flow molstic-L is designed specifically for Fluke Calibration’s largest molbloc-L.
It is required for the:
1E5-L
molbloc.
The 1E5-L provides nominal gas flow capability up to approximately:
100 slm.
Fluke specifies that the High Flow molstic-L supports the 1E5-L only.
The larger pneumatic configuration is necessary to handle the higher gas flow without introducing excessive unwanted pressure drop.
Low, Mid and High Flow Comparison
The three molstic-L configurations allow the mounting system to be matched to the molbloc-L being used.
Low Flow
Optimized for very low gas flows.
Required for 2E2-L and smaller molblocs and usable up to 1E3-L.
Uses a high-stability regulator, reduced dead volume and 0.5 micron filtration.
Mid Flow
Supports a broad range of molbloc-L elements from approximately 2E2-L through 3E4-L.
Available in Single and Dual configurations.
High Flow
Designed specifically for the 1E5-L 100 slm molbloc.
Available as a Single configuration.
Selecting the correct molstic-L is therefore important for achieving optimum molbloc/molbox system performance.
Compact Integrated Construction
The Fluke Calibration molstic-L integrates high-quality pneumatic components onto a dedicated mounting platform.
This provides a more structured solution than assembling a calibration bench from individual regulators, filters, valves, tubing and mounting components.
Advantages of the integrated design include:
- Defined component arrangement
- Reduced setup complexity
- Easier molbloc installation
- Improved reproducibility
- Organized pressure connections
- Simplified DUT connection
- Easier leak testing
- Compact laboratory installation
This is particularly useful in professional calibration laboratories where the same flow setup is used repeatedly.
Dimensions
The dimensions depend on the selected molstic-L configuration.
For example, Fluke specifies a main platform length of approximately:
584 mm for the Single Low Flow configuration.
The Dual Mid Flow configuration has a main platform length of approximately:
690 mm.
The Single High Flow configuration also has a main platform length of approximately:
690 mm.
The complete dimensions vary according to the regulator, valve and connection configuration.
molstic-L with molbloc-L
The distinction between the Fluke Calibration molstic-L and molbloc-L is important.
The:
molbloc-L
is the characterized laminar mass flow element.
The:
molstic-L
is the mounting and pneumatic system.
The molstic-L itself does not determine the reference flow.
Instead, it creates the controlled mechanical and pneumatic environment in which the molbloc-L operates.
molstic-L with molbox2
A modern gas flow calibration setup can combine:
Fluke Calibration molstic-L + molbloc-L + molbox2
The individual functions are clearly separated.
The molstic-L provides:
- Gas supply connection
- Filtration
- Pressure regulation
- Isolation
- Mechanical mounting
- DUT connection
- Optional flow adjustment
The molbloc-L provides:
- Characterized laminar flow element
- Precision flow restriction
- Individual calibration characteristics
- Integrated temperature measurement
The molbox2 provides:
- Differential pressure measurement
- Absolute pressure measurement
- Temperature measurement
- Gas property calculations
- Reference mass flow calculation
- Flow indication
- Communication and automation capabilities
Together, these components create a complete professional gas mass flow calibration system.
molstic-L vs. molstic-S
The Fluke Calibration molstic-L and molstic-S are both mounting platforms for the Fluke Calibration molbloc/molbox system, but they are designed for different flow elements.
The:
molstic-L
is designed for:
molbloc-L laminar flow elements.
The:
molstic-S
is designed for:
molbloc-S sonic nozzle flow elements.
Because the two flow technologies have different pressure, flow and connection requirements, Fluke provides dedicated molstic systems for each type.
For a laboratory using both laminar and sonic nozzle flow standards, the corresponding molstic-L and molstic-S platforms provide a structured approach to building the complete flow calibration system.
Integration into Automated Flow Calibration Systems
The Fluke Calibration molstic-L can form part of a fully automated molbloc/molbox calibration system.
The reference flow is measured by the molbloc/molbox system while appropriate control hardware manages the flow conditions.
Depending on the configuration, automation can include:
- Flow point generation
- MFC control
- Reference flow measurement
- Pressure measurement
- Temperature measurement
- Stabilization
- Data acquisition
- Calibration sequence execution
- Result processing
This allows the same basic molstic-L platform to be used in both manual and automated calibration environments.
COMPASS for Flow
A complete molbloc/molbox system can be integrated with Fluke Calibration’s:
COMPASS for Flow
calibration software.
The software supports automated gas flow calibration procedures and coordinates compatible Fluke Calibration flow hardware with the device under test.
The molstic-L provides the physical and pneumatic platform while the molbox and software perform the measurement, control and automation functions.
Available molstic-L Models
Fluke Calibration currently lists several molstic-L configurations.
MSTIC-401316
molstic-L Mounting System, Single, Low Flow
MSTIC-401318
molstic-L Mounting System, Dual, Low Flow
MSTIC-401244
molstic-L Mounting System, Single, Mid Flow
MSTIC-401317
molstic-L Mounting System, Dual, Mid Flow
MVLV-401663
molstic-L Mounting System, Single, High Flow
Optional metering valves include:
MVLV-401319
Low Flow metering valve for molstic-L
and:
MVLV-401320
Mid / High Flow metering valve for molstic-L.
Technical Highlights
| Feature | Fluke Calibration molstic-L |
|---|---|
| Device type | Mounting and pneumatic system |
| Compatible flow element | molbloc-L |
| Measurement principle | No independent flow measurement |
| Configurations | Low / Mid / High Flow |
| Channels | Single / Dual depending on version |
| Gas supply connection | Quick connector |
| Standard filtration | 2 µm |
| Low Flow filtration | 0.5 µm |
| Pressure regulator | Integrated, adjustable |
| Shut-off valve | Bellows valve |
| DUT connection | Downstream |
| Manual flow control | Optional metering valve |
| Low Flow compatibility | Required for 2E2-L and lower; usable to 1E3-L |
| Mid Flow compatibility | Approx. 2E2-L to 3E4-L |
| High Flow compatibility | 1E5-L only |
| High Flow molbloc | Up to approx. 100 slm |
| Automation | Suitable for molbloc/molbox automated systems |
| Software integration | COMPASS for Flow |
Typical Applications
The Fluke Calibration molstic-L is suitable for building calibration systems for:
- Mass flow controllers
- Mass flow meters
- Thermal mass flow meters
- Low-flow meters
- Rotameters
- Variable-area flow meters
- Gas flow sensors
- Process gas flow meters
- Gas analyzer flow systems
- Environmental monitoring equipment
- Semiconductor process equipment
- Pharmaceutical applications
- Research laboratories
- Calibration laboratories
- Industrial gas flow metrology
Why Choose the Fluke Calibration molstic-L?
The Fluke Calibration molstic-L provides a professionally engineered mechanical and pneumatic platform for molbloc-L laminar mass flow elements.
Rather than assembling a flow calibration system from individual filters, regulators, valves, tubing and mounting components, the molstic-L integrates the essential components into a compact system specifically designed to maximize molbloc/molbox performance.
An integrated filter protects the downstream components, while the adjustable pressure regulator establishes the required molbloc operating pressure and protects the molbox pressure transducers against accidental overpressure.
A bellows shut-off valve simplifies configuration changes and system leak testing.
Dedicated cradles provide stable molbloc mounting, while the downstream connection allows a mass flow controller, other device under test or optional precision metering valve to be installed directly into the system.
Low Flow, Mid Flow and High Flow configurations ensure that the pneumatic system can be matched to the required molbloc-L range.
Single and Dual versions provide additional flexibility, with Dual systems allowing two molbloc-L elements to remain installed simultaneously for faster switching between different flow ranges.
Combined with a Fluke Calibration molbloc-L and molbox2 Flow Terminal, the molstic-L becomes an essential part of a modular, accurate and highly flexible gas flow calibration system.
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 the Fluke Calibration molstic-L is available on the official Fluke Calibration website.
