{"id":6661,"date":"2026-07-17T17:04:21","date_gmt":"2026-07-17T17:04:21","guid":{"rendered":"https:\/\/europascal.de\/product\/fluke-calibration-molbox-rfm\/"},"modified":"2026-10-01T10:15:07","modified_gmt":"2026-10-01T10:15:07","slug":"fluke-calibration-molbox-rfm","status":"publish","type":"product","link":"https:\/\/europascal.de\/en\/product\/fluke-calibration-molbox-rfm\/","title":{"rendered":"Fluke Calibration molbox RFM Precise Reference Flow Monitor"},"content":{"rendered":"<p><strong>Fluke Calibration molbox RFM<\/strong> is a precise reference flow monitor designed for professional gas mass and volume flow measurement with Fluke Calibration molbloc-L and molbloc-S flow elements. As the central measurement and calculation unit of a molbloc\/molbox system, the molbox RFM measures the pressure and temperature conditions associated with the connected molbloc and calculates the corresponding gas flow in real time.<\/p>\n<p>The system combines the molbox RFM with interchangeable molbloc flow elements, allowing a single reference flow monitor to cover an exceptionally broad range of gas flow applications. With molbloc-L laminar flow elements, flow rates from approximately <strong>1 sccm to 100 slm<\/strong> can be covered. When used with molbloc-S sonic nozzle flow elements, the overall system range can extend to approximately <strong>5,000 slm<\/strong>.<\/p>\n<p>The Fluke Calibration molbox RFM supports both mass flow and volume flow measurement. Reference pressure and temperature conditions for volume flow can be selected by the user, making the system highly flexible for different industrial and laboratory flow calibration requirements.<\/p>\n<p>With suitable molbloc calibration, the molbox RFM provides accredited measurement uncertainty down to <strong>\u00b10.5% of reading<\/strong> and rangeability of up to <strong>100:1<\/strong>. Optional Microrange functionality significantly improves resolution and low-flow performance when operating compatible molbloc-L elements below 10% of their full-scale range.<\/p>\n<p>The molbox RFM also includes advanced measurement functions such as totalization, averaging, maximum and minimum value display and deviation measurement. Integrated valves support functions such as venting, leak testing and zeroing.<\/p>\n<p><strong>Important:<\/strong> The Fluke Calibration molbox RFM is a discontinued product. Fluke Calibration currently recommends newer molbox flow terminal technology for new systems. The molbox RFM nevertheless remains relevant for existing molbloc\/molbox installations, replacement requirements and legacy calibration systems.<\/p>\n<p>At <strong>europascal<\/strong>, we provide professional solutions for gas flow, pressure, temperature and electrical calibration. For information about professional calibration and metrological traceability, visit the <a href=\"https:\/\/europascal.de\/en\/calibration-services\/\">europascal Calibration Service<\/a>.<\/p>\n<h2>Your Benefits at a Glance<\/h2>\n<p>The <strong>Fluke Calibration molbox RFM<\/strong> combines precision pressure and temperature measurement with intelligent flow calculation for professional molbloc-based gas flow calibration.<\/p>\n<p>Key features include:<\/p>\n<ul>\n<li>Reference flow monitor for molbloc flow elements<\/li>\n<li>Compatible with molbloc-L laminar flow elements<\/li>\n<li>Compatible with molbloc-S sonic nozzle flow elements<\/li>\n<li>System flow capability from approximately 1 sccm to 5,000 slm<\/li>\n<li>Mass flow measurement<\/li>\n<li>Volume flow measurement<\/li>\n<li>User-selectable reference temperature and pressure conditions<\/li>\n<li>Accredited measurement uncertainty down to \u00b10.5% of reading<\/li>\n<li>Rangeability up to 100:1 depending on configuration<\/li>\n<li>Optional Microrange functionality<\/li>\n<li>1 second measurement update rate<\/li>\n<li>Supports approximately 20 selectable gases<\/li>\n<li>Integrated valve functions<\/li>\n<li>Leak testing support<\/li>\n<li>Zeroing functions<\/li>\n<li>Flow totalization<\/li>\n<li>Averaging<\/li>\n<li>Maximum and minimum value functions<\/li>\n<li>Deviation display<\/li>\n<li>Front-panel operation<\/li>\n<li>RS-232 communication<\/li>\n<li>IEEE-488 remote communication<\/li>\n<li>Compatible with COMPASS for molbox software<\/li>\n<li>Suitable for manual and automated calibration<\/li>\n<li>Compatible with molstic-L and molstic-S mounting systems<\/li>\n<\/ul>\n<h2>molbox RFM Reference Flow Monitor<\/h2>\n<p>RFM stands for:<\/p>\n<p><strong>Reference Flow Monitor<\/strong>.<\/p>\n<p>The Fluke Calibration molbox RFM is not itself the physical flow restriction or sonic nozzle.<\/p>\n<p>Instead, it operates together with an interchangeable:<\/p>\n<p><strong>molbloc-L<\/strong><\/p>\n<p>or:<\/p>\n<p><strong>molbloc-S<\/strong><\/p>\n<p>flow element.<\/p>\n<p>The molbloc provides the characterized flow element, while the molbox RFM performs the necessary pressure and temperature measurements and calculates the corresponding gas flow.<\/p>\n<p>A complete system can therefore consist of:<\/p>\n<p><strong>Gas Supply \u2192 molstic \u2192 molbloc \u2192 Device Under Test<\/strong><\/p>\n<p>with the:<\/p>\n<p><strong>molbox RFM<\/strong><\/p>\n<p>connected to the molbloc for reference measurement.<\/p>\n<h2>Compatible with molbloc-L<\/h2>\n<p>The <strong>Fluke Calibration molbox RFM<\/strong> supports molbloc-L laminar flow elements.<\/p>\n<p>The molbloc-L operates according to the laminar flow principle.<\/p>\n<p>Gas passing through the precision laminar flow element produces a differential pressure that depends on the flow rate, gas properties and operating conditions.<\/p>\n<p>The molbox RFM measures the relevant pressure conditions and temperature and combines these values with the individual molbloc calibration characteristics to determine gas flow.<\/p>\n<p>Depending on the selected molbloc-L, gas and calibration configuration, the molbloc-L family can cover flow rates from approximately:<\/p>\n<p><strong>1 sccm to 100 slm<\/strong>.<\/p>\n<h2>Compatible with molbloc-S<\/h2>\n<p>The molbox RFM can also operate with:<\/p>\n<p><strong>molbloc-S sonic nozzle flow elements<\/strong>.<\/p>\n<p>The molbloc-S operates according to the critical-flow or choked-flow principle.<\/p>\n<p>When the required pressure ratio is reached, the gas reaches sonic velocity at the nozzle throat.<\/p>\n<p>Under these conditions, mass flow is primarily determined by:<\/p>\n<ul>\n<li>Upstream absolute pressure<\/li>\n<li>Gas temperature<\/li>\n<li>Gas properties<\/li>\n<li>Nozzle characteristics<\/li>\n<\/ul>\n<p>The molbox RFM measures the required operating parameters and calculates the corresponding reference flow.<\/p>\n<p>Using suitable molbloc-S elements, the overall flow range can extend to approximately:<\/p>\n<p><strong>5,000 slm<\/strong>.<\/p>\n<h2>Flow Range from 1 sccm to 5,000 slm<\/h2>\n<p>One of the major advantages of the <strong>Fluke Calibration molbox RFM<\/strong> is the extremely broad system flow range enabled by interchangeable molbloc elements.<\/p>\n<p>With:<\/p>\n<p><strong>molbloc-L<\/strong><\/p>\n<p>the system covers approximately:<\/p>\n<p><strong>1 sccm to 100 slm<\/strong>.<\/p>\n<p>With:<\/p>\n<p><strong>molbloc-S<\/strong><\/p>\n<p>the range can extend to approximately:<\/p>\n<p><strong>5,000 slm<\/strong>.<\/p>\n<p>The actual usable range depends on the selected molbloc, calibration gas, operating pressure and calibration configuration.<\/p>\n<p>This modular approach allows a laboratory to use one molbox RFM with multiple flow elements instead of requiring a separate electronic flow standard for every range.<\/p>\n<h2>Measurement Uncertainty Down to \u00b10.5%<\/h2>\n<p>When used with appropriately calibrated molbloc flow elements, the <strong>Fluke Calibration molbox RFM<\/strong> provides accredited measurement uncertainty down to:<\/p>\n<p><strong>\u00b10.5% of reading<\/strong>.<\/p>\n<p>For molbloc-L elements from 1E1-L through 3E4-L, Fluke specifies:<\/p>\n<p><strong>\u00b10.5% of reading from 10% to 100% FS<\/strong><\/p>\n<p>and:<\/p>\n<p><strong>\u00b10.05% FS below 10% FS<\/strong>.<\/p>\n<p>For molbloc-S elements, the measurement uncertainty is specified at:<\/p>\n<p><strong>\u00b10.5% of reading from 50 kPa to 500 kPa upstream pressure<\/strong>.<\/p>\n<p>The exact specification depends on the molbloc and calibration configuration.<\/p>\n<h2>High Rangeability<\/h2>\n<p>The molbox RFM system can provide rangeability of up to:<\/p>\n<p><strong>100:1<\/strong>.<\/p>\n<p>This is particularly useful when a calibration laboratory must cover a broad flow range with a limited number of reference elements.<\/p>\n<p>The achievable rangeability depends on the selected molbloc and the available calibration options.<\/p>\n<p>Optional Microrange functionality further improves performance at low percentages of molbloc-L full scale.<\/p>\n<h2>Microrange Option<\/h2>\n<p>The <strong>Fluke Calibration molbox RFM<\/strong> was available with an optional:<\/p>\n<p><strong>Microrange<\/strong><\/p>\n<p>configuration.<\/p>\n<p>This option improves measurement resolution and performance at low flow rates when using molbloc-L elements.<\/p>\n<p>For molbloc-L ranges from 1E1-L through 3E4-L, standard resolution is:<\/p>\n<p><strong>0.01% FS<\/strong>.<\/p>\n<p>With Microrange, resolution improves below 10% FS to:<\/p>\n<p><strong>0.001% FS<\/strong>.<\/p>\n<p>The Microrange option also extends specified molbloc-L performance farther down the flow range.<\/p>\n<p>For the:<\/p>\n<p><strong>1E5-L<\/strong><\/p>\n<p>molbloc, Microrange is required to achieve the specified performance.<\/p>\n<p>When a molbloc-S is connected, the Microrange transducer is disabled because it is not required for sonic nozzle operation.<\/p>\n<h2>1 Second Measurement Update Rate<\/h2>\n<p>The <strong>Fluke Calibration molbox RFM<\/strong> provides a measurement update rate of:<\/p>\n<p><strong>1 second<\/strong>.<\/p>\n<p>This applies to both molbloc-L and molbloc-S operation.<\/p>\n<p>The continuous reference indication makes the system suitable for calibrating devices whose output must be observed directly while the flow is adjusted.<\/p>\n<p>This is especially useful for:<\/p>\n<ul>\n<li>Mass flow controllers<\/li>\n<li>Mass flow meters<\/li>\n<li>Rotameters<\/li>\n<li>Variable-area flow meters<\/li>\n<li>Gas flow sensors<\/li>\n<\/ul>\n<h2>Mass Flow Measurement<\/h2>\n<p>The molbox RFM can directly calculate and display:<\/p>\n<p><strong>mass flow<\/strong>.<\/p>\n<p>Mass flow measurement is particularly useful for gas calibration because it is independent of arbitrary reference temperature and pressure conditions.<\/p>\n<p>This makes the system well suited to calibration of thermal mass flow meters and mass flow controllers.<\/p>\n<h2>Volume Flow Measurement<\/h2>\n<p>In addition to mass flow, the <strong>Fluke Calibration molbox RFM<\/strong> can calculate and display:<\/p>\n<p><strong>volume flow<\/strong>.<\/p>\n<p>The user can define the reference pressure and temperature conditions used for the volume flow calculation.<\/p>\n<p>This is important because standardized volume flow depends on the selected reference conditions.<\/p>\n<p>The same physical gas flow can therefore be expressed in different volumetric units depending on the selected reference temperature and pressure.<\/p>\n<h2>Multiple Gas Selection<\/h2>\n<p>The molbox RFM provides selection of approximately:<\/p>\n<p><strong>20 different gases<\/strong>.<\/p>\n<p>The selected gas is included in the flow calculation.<\/p>\n<p>This enables the system to be adapted to different gas flow calibration applications without changing the basic reference flow monitor.<\/p>\n<p>The available flow range and measurement uncertainty depend on the molbloc calibration and gas being used.<\/p>\n<h2>Advanced Measurement Functions<\/h2>\n<p>The <strong>Fluke Calibration molbox RFM<\/strong> includes several advanced measurement functions that simplify calibration work.<\/p>\n<p>These include:<\/p>\n<p><strong>Totalization<\/strong><\/p>\n<p>for integrating flow over time.<\/p>\n<p><strong>Averaging<\/strong><\/p>\n<p>for determining an average flow value over a measurement period.<\/p>\n<p><strong>Maximum and Minimum<\/strong><\/p>\n<p>for observing flow extremes.<\/p>\n<p><strong>Deviation<\/strong><\/p>\n<p>for evaluating differences from a defined reference or target value.<\/p>\n<p>These functions make the instrument useful for both calibration and more general flow measurement applications.<\/p>\n<h2>Integrated Valve Functions<\/h2>\n<p>Internal valves in the molbox RFM support several important measurement and maintenance functions.<\/p>\n<p>These include:<\/p>\n<ul>\n<li>Integrated venting<\/li>\n<li>Leak testing<\/li>\n<li>Zeroing<\/li>\n<\/ul>\n<p>This reduces the need for external pneumatic switching components and simplifies operation of the complete flow calibration system.<\/p>\n<h2>Front Panel Operation<\/h2>\n<p>The <strong>Fluke Calibration molbox RFM<\/strong> can be fully operated from its front panel.<\/p>\n<p>This allows manual calibration work without requiring a permanently connected computer.<\/p>\n<p>The user can select measurement functions, configure operating parameters and monitor reference flow directly from the instrument.<\/p>\n<p>For automated systems, remote communication interfaces are also provided.<\/p>\n<h2>RS-232 Communication<\/h2>\n<p>The molbox RFM provides:<\/p>\n<p><strong>RS-232<\/strong><\/p>\n<p>remote communication.<\/p>\n<p>This enables connection to a PC or automated calibration system.<\/p>\n<p>RS-232 can be used for remote commands, measurement data transfer and software-controlled calibration procedures.<\/p>\n<h2>IEEE-488 Interface<\/h2>\n<p>For laboratory automation, the <strong>Fluke Calibration molbox RFM<\/strong> also provides:<\/p>\n<p><strong>IEEE-488<\/strong><\/p>\n<p>communication.<\/p>\n<p>This interface was widely used in automated calibration laboratories and enables the molbox RFM to be integrated with other programmable reference standards and measurement equipment.<\/p>\n<h2>COMPASS for molbox Software<\/h2>\n<p>The <strong>Fluke Calibration molbox RFM<\/strong> is supported by:<\/p>\n<p><strong>COMPASS for molbox<\/strong><\/p>\n<p>PC-based calibration software.<\/p>\n<p>COMPASS for molbox combines molbloc\/molbox reference measurement with automated calibration procedures.<\/p>\n<p>The software can be used to calibrate and test devices such as:<\/p>\n<ul>\n<li>Mass flow controllers<\/li>\n<li>Mass flow meters<\/li>\n<li>Variable-area flow meters<\/li>\n<li>Turbine flow meters<\/li>\n<li>Bubble flow meters<\/li>\n<li>Other gas flow measurement devices<\/li>\n<\/ul>\n<p>This turns the molbox RFM and molbloc combination into a complete automated flow calibration platform.<\/p>\n<h2>molbox RFM with molstic-L<\/h2>\n<p>When operating with molbloc-L elements, the <strong>Fluke Calibration molbox RFM<\/strong> can be combined with a:<\/p>\n<p><strong>molstic-L Mounting System<\/strong>.<\/p>\n<p>The molstic-L provides:<\/p>\n<ul>\n<li>Gas supply connection<\/li>\n<li>Filtration<\/li>\n<li>Pressure regulation<\/li>\n<li>Isolation<\/li>\n<li>molbloc-L mounting<\/li>\n<li>DUT connection<\/li>\n<li>Optional flow adjustment<\/li>\n<\/ul>\n<p>The molbox RFM then performs the measurement and flow calculation functions.<\/p>\n<h2>molbox RFM with molstic-S<\/h2>\n<p>For molbloc-S sonic nozzle applications, the molbox RFM can be combined with:<\/p>\n<p><strong>molstic-S<\/strong>.<\/p>\n<p>The molstic-S provides the mechanical and pneumatic infrastructure required for the molbloc-S.<\/p>\n<p>Depending on configuration, it supports:<\/p>\n<ul>\n<li>Gas supply connection<\/li>\n<li>molbloc-S mounting<\/li>\n<li>Isolation<\/li>\n<li>Flow adjustment<\/li>\n<li>Pressure regulation<\/li>\n<li>DUT integration<\/li>\n<\/ul>\n<p>This modular concept allows complete gas flow calibration benches to be assembled from components designed to operate together.<\/p>\n<h2>Example molbox RFM Systems<\/h2>\n<p>Fluke offered several complete molbox RFM calibration systems.<\/p>\n<p>Examples include:<\/p>\n<p><strong>5141-100<\/strong><\/p>\n<p>molbox RFM with 5E1-L molbloc for approximately 10 to 100 sccm.<\/p>\n<p><strong>5141-1K<\/strong><\/p>\n<p>molbox RFM with 5E2-L molbloc for approximately 100 to 1,000 sccm.<\/p>\n<p><strong>5141-10K<\/strong><\/p>\n<p>molbox RFM with 5E3-L molbloc for approximately 1 to 10 slm.<\/p>\n<p><strong>5141-50K<\/strong><\/p>\n<p>molbox RFM with 3E4-L molbloc for approximately 5 to 50 slm.<\/p>\n<p>These kits included the reference flow monitor, molbloc-L, molstic-L mounting system and the tubing and adapters required to connect the gas supply and device under test.<\/p>\n<h2>molbox RFM-M<\/h2>\n<p>Fluke also offered:<\/p>\n<p><strong>molbox RFM-M<\/strong><\/p>\n<p>versions incorporating enhanced low-range measurement capability.<\/p>\n<p>Example systems included:<\/p>\n<p><strong>5142-1K<\/strong><\/p>\n<p>covering approximately 10 to 1,000 sccm.<\/p>\n<p><strong>5142-10K<\/strong><\/p>\n<p>covering approximately 0.1 to 10 slm.<\/p>\n<p><strong>5142-50K<\/strong><\/p>\n<p>covering approximately 0.5 to 50 slm.<\/p>\n<p>A wider-range:<\/p>\n<p><strong>5144-50K<\/strong><\/p>\n<p>system combined 5E2-L and 3E4-L molblocs to cover approximately:<\/p>\n<p><strong>10 sccm to 50 slm<\/strong>.<\/p>\n<h2>Technical Highlights<\/h2>\n<table>\n<tbody>\n<tr>\n<th>Feature<\/th>\n<th>Fluke Calibration molbox RFM<\/th>\n<\/tr>\n<tr>\n<td>Device type<\/td>\n<td>Reference Flow Monitor<\/td>\n<\/tr>\n<tr>\n<td>Status<\/td>\n<td>Discontinued<\/td>\n<\/tr>\n<tr>\n<td>Flow elements<\/td>\n<td>molbloc-L and molbloc-S<\/td>\n<\/tr>\n<tr>\n<td>Overall system range<\/td>\n<td>Approx. 1 sccm to 5,000 slm<\/td>\n<\/tr>\n<tr>\n<td>Measurement uncertainty<\/td>\n<td>Down to \u00b10.5% of reading<\/td>\n<\/tr>\n<tr>\n<td>Update rate<\/td>\n<td>1 second<\/td>\n<\/tr>\n<tr>\n<td>Gas selection<\/td>\n<td>Approx. 20 gases<\/td>\n<\/tr>\n<tr>\n<td>Mass flow<\/td>\n<td>Yes<\/td>\n<\/tr>\n<tr>\n<td>Volume flow<\/td>\n<td>Yes<\/td>\n<\/tr>\n<tr>\n<td>Reference conditions<\/td>\n<td>User selectable<\/td>\n<\/tr>\n<tr>\n<td>Microrange<\/td>\n<td>Optional<\/td>\n<\/tr>\n<tr>\n<td>Totalization<\/td>\n<td>Yes<\/td>\n<\/tr>\n<tr>\n<td>Averaging<\/td>\n<td>Yes<\/td>\n<\/tr>\n<tr>\n<td>Maximum \/ Minimum<\/td>\n<td>Yes<\/td>\n<\/tr>\n<tr>\n<td>Deviation display<\/td>\n<td>Yes<\/td>\n<\/tr>\n<tr>\n<td>Leak test support<\/td>\n<td>Yes<\/td>\n<\/tr>\n<tr>\n<td>Remote interface<\/td>\n<td>RS-232<\/td>\n<\/tr>\n<tr>\n<td>Laboratory interface<\/td>\n<td>IEEE-488<\/td>\n<\/tr>\n<tr>\n<td>Software<\/td>\n<td>COMPASS for molbox<\/td>\n<\/tr>\n<tr>\n<td>molbloc-L support<\/td>\n<td>Yes<\/td>\n<\/tr>\n<tr>\n<td>molbloc-S support<\/td>\n<td>Yes<\/td>\n<\/tr>\n<tr>\n<td>molstic-L compatibility<\/td>\n<td>Yes<\/td>\n<\/tr>\n<tr>\n<td>molstic-S compatibility<\/td>\n<td>Yes<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>molbox RFM vs. molbloc<\/h2>\n<p>The distinction between the <strong>Fluke Calibration molbox RFM<\/strong> and molbloc is important.<\/p>\n<p>The:<\/p>\n<p><strong>molbox RFM<\/strong><\/p>\n<p>is the electronic reference flow monitor.<\/p>\n<p>The:<\/p>\n<p><strong>molbloc-L<\/strong><\/p>\n<p>is the laminar flow element.<\/p>\n<p>The:<\/p>\n<p><strong>molbloc-S<\/strong><\/p>\n<p>is the sonic nozzle flow element.<\/p>\n<p>The molbox RFM therefore does not create the physical flow restriction used as the reference.<\/p>\n<p>Instead, it measures the relevant operating parameters and uses the calibration characteristics of the connected molbloc to determine the reference flow.<\/p>\n<h2>molbox RFM vs. molstic<\/h2>\n<p>The molbox RFM must also be distinguished from the molstic mounting systems.<\/p>\n<p>The:<\/p>\n<p><strong>molbox RFM<\/strong><\/p>\n<p>performs measurement and flow calculation.<\/p>\n<p>The:<\/p>\n<p><strong>molstic-L<\/strong><\/p>\n<p>provides the mounting and pneumatic system for molbloc-L.<\/p>\n<p>The:<\/p>\n<p><strong>molstic-S<\/strong><\/p>\n<p>provides the mounting and pneumatic system for molbloc-S.<\/p>\n<p>Together these components can form a complete professional gas flow calibration bench.<\/p>\n<h2>Typical Applications<\/h2>\n<p>The <strong>Fluke Calibration molbox RFM<\/strong> can be used for:<\/p>\n<ul>\n<li>Mass flow controller calibration<\/li>\n<li>Mass flow meter calibration<\/li>\n<li>Thermal mass flow meter calibration<\/li>\n<li>Rotameter calibration<\/li>\n<li>Variable-area flow meter calibration<\/li>\n<li>Turbine gas meter calibration<\/li>\n<li>Bubble flow meter calibration<\/li>\n<li>Gas flow sensor calibration<\/li>\n<li>Environmental monitoring<\/li>\n<li>Semiconductor applications<\/li>\n<li>Pharmaceutical applications<\/li>\n<li>Industrial gas flow calibration<\/li>\n<li>Research and development<\/li>\n<li>Calibration laboratories<\/li>\n<li>Automated gas flow calibration<\/li>\n<li>Flow transfer standard applications<\/li>\n<\/ul>\n<h2>Discontinued Product<\/h2>\n<p>The <strong>Fluke Calibration molbox RFM is discontinued<\/strong>.<\/p>\n<p>Fluke Calibration no longer manufactures the instrument as a current product.<\/p>\n<p>This is particularly important when planning a new calibration system.<\/p>\n<p>Existing molbox RFM instruments can nevertheless remain valuable components of established molbloc\/molbox calibration systems.<\/p>\n<p>Fluke Calibration continues to list calibration and repair support for molbox mass flow terminals including the molbox RFM and molbox RFM-M.<\/p>\n<p>For new installations, current Fluke Calibration molbox technology should be evaluated.<\/p>\n<h2>Why Choose the Fluke Calibration molbox RFM?<\/h2>\n<p>The <strong>Fluke Calibration molbox RFM<\/strong> established a flexible approach to professional gas flow calibration by separating the electronic measurement system from the interchangeable flow element.<\/p>\n<p>Using molbloc-L and molbloc-S elements, the same reference flow monitor can cover an overall system range from approximately <strong>1 sccm to 5,000 slm<\/strong>.<\/p>\n<p>Accredited measurement uncertainty down to <strong>\u00b10.5% of reading<\/strong>, support for approximately 20 gases and a measurement update rate of one second make the instrument suitable for demanding gas flow calibration applications.<\/p>\n<p>The optional Microrange function improves low-flow performance with compatible molbloc-L elements, while integrated functions such as totalization, averaging, maximum\/minimum measurement and deviation display provide additional measurement capability.<\/p>\n<p>RS-232 and IEEE-488 communication allow integration into automated calibration systems, while COMPASS for molbox provides PC-based calibration automation.<\/p>\n<p>Although the <strong>Fluke Calibration molbox RFM is discontinued<\/strong>, it remains relevant for existing molbloc\/molbox installations and laboratories maintaining legacy Fluke Calibration flow systems.<\/p>\n<p>At <strong>europascal<\/strong>, we provide Fluke Calibration flow, pressure, temperature and electrical calibration technology for professional laboratory and industrial applications.<\/p>\n<p>For professional calibration and metrological traceability, visit the <a href=\"https:\/\/europascal.de\/en\/calibration-services\/\">europascal Calibration Service<\/a>.<\/p>\n<p>Further products from <strong>Fluke Calibration<\/strong> are available from europascal.<\/p>\n<p>Manufacturer information about the <strong>Fluke Calibration molbox RFM<\/strong> is available on the official Fluke Calibration website.<\/p>\n<p><a class=\"download-datasheet\" href=\"#\" data-pdf=\"https:\/\/europascal.de\/wp-content\/uploads\/2026\/07\/Fluke-molbox-RFM-Reference-Flow-Monitor.pdf\"><span style=\"color: #0000ff;\"><strong><em>Download Datasheet<\/em><\/strong><\/span><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>The <strong>Fluke Calibration molbox RFM<\/strong> is a precise reference flow monitor for professional gas mass and volume flow calibration with molbloc-L and molbloc-S flow elements. Depending on the molbloc configuration, the system covers flow rates from approximately <strong>1 sccm to 5,000 slm<\/strong> with measurement uncertainty down to <strong>\u00b10.5% of reading<\/strong>. The molbox RFM is discontinued but remains relevant for existing molbloc\/molbox calibration systems.<\/p>\n","protected":false},"featured_media":3166,"template":"","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"_members_access_role":[],"_members_access_error":""},"product_brand":[89],"product_cat":[1251,1249],"product_tag":[5325,5373,5326,5327,5374,5375,5330,5347,3922,5332,5349,5334,5336,5376,5337,5338,5359,5340,5341,5377],"class_list":["post-6661","product","type-product","status-publish","has-post-thumbnail","product_brand-fluke-calibration","product_cat-flow-calibrators","product_cat-gas-mass-flow","product_tag-compass-for-flow","product_tag-compass-for-molbox","product_tag-durchflussmesstechnik","product_tag-durchflussnormal","product_tag-fluke-calibration-molbox-rfm","product_tag-fluke-molbox-rfm","product_tag-gasdurchflusskalibrierung","product_tag-gasdurchflussnormal","product_tag-kalibrierlabor","product_tag-mass-flow-controller-kalibrieren","product_tag-massedurchflusskalibrierung","product_tag-massedurchflussmesser-kalibrieren","product_tag-mfc-kalibrierung","product_tag-microrange","product_tag-molbloc-l","product_tag-molbloc-s","product_tag-molbox-rfm","product_tag-molstic-l","product_tag-molstic-s","product_tag-referenz-durchflussmonitor","desktop-align-left","tablet-align-left","mobile-align-left","first","instock","product-type-simple"],"_links":{"self":[{"href":"https:\/\/europascal.de\/en\/wp-json\/wp\/v2\/product\/6661","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/europascal.de\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/europascal.de\/en\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/europascal.de\/en\/wp-json\/wp\/v2\/media\/3166"}],"wp:attachment":[{"href":"https:\/\/europascal.de\/en\/wp-json\/wp\/v2\/media?parent=6661"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/europascal.de\/en\/wp-json\/wp\/v2\/product_brand?post=6661"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/europascal.de\/en\/wp-json\/wp\/v2\/product_cat?post=6661"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/europascal.de\/en\/wp-json\/wp\/v2\/product_tag?post=6661"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}