{"id":6663,"date":"2026-07-17T17:04:26","date_gmt":"2026-07-17T17:04:26","guid":{"rendered":"https:\/\/europascal.de\/product\/fluke-calibration-molbox1\/"},"modified":"2026-10-01T10:19:32","modified_gmt":"2026-10-01T10:19:32","slug":"fluke-calibration-molbox1","status":"publish","type":"product","link":"https:\/\/europascal.de\/en\/product\/fluke-calibration-molbox1\/","title":{"rendered":"Fluke Calibration molbox1+"},"content":{"rendered":"<p><strong>Fluke Calibration molbox1+<\/strong> is a precise flow terminal for professional gas mass flow measurement and calibration with Fluke Calibration molbloc-L and molbloc-S flow elements. It combines high-accuracy pressure and temperature measurement with sophisticated gas property calculations to create a flexible reference system for calibrating mass flow controllers, mass flow meters and many other gas flow measurement devices.<\/p>\n<p>Combined with interchangeable molbloc flow elements, the molbox1+ can be used in systems covering gas flow rates from approximately <strong>1 sccm to 6000 slm<\/strong>. With Premium molbloc calibration, measurement uncertainty can be as low as <strong>\u00b10.125% of reading<\/strong>.<\/p>\n<p>The molbox1+ uses Fluke Calibration&#8217;s Q-RPT quartz reference pressure transducer technology for precise absolute and differential pressure measurement. The system also measures the PRT integrated into the connected molbloc and combines pressure, temperature, individual molbloc calibration data and gas properties to calculate gas mass flow in real time.<\/p>\n<p>Both <strong>molbloc-L laminar flow elements<\/strong> and <strong>molbloc-S sonic nozzle flow elements<\/strong> are supported by the standard molbox1+ configurations. A special <strong>molbox1+S<\/strong> version was developed for molbloc-S applications requiring higher upstream pressures and increased rangeability.<\/p>\n<p>Multiple calibration types can be stored for each gas in the molbloc EEPROM, allowing the same molbloc to be used for high- and low-pressure applications without manually loading separate calibration files.<\/p>\n<p>Optional MFC control enables analog mass flow controllers to be set and measured directly, while RS-232 and IEEE-488.2 interfaces support integration into automated calibration systems. COMPASS for Flow software can further automate complete flow calibration procedures.<\/p>\n<p><strong>Important:<\/strong> The Fluke Calibration molbox1+ is no longer manufactured. For new flow calibration systems, Fluke currently recommends the <strong>molbox2 Flow Terminal<\/strong>. Existing molbox1+ systems nevertheless remain relevant, and Fluke continues to list calibration and repair support for the molbox1+.<\/p>\n<p>At <strong>europascal<\/strong>, we provide professional flow, pressure, temperature and electrical calibration solutions. 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 molbox1+<\/strong> combines high-performance reference pressure measurement with interchangeable molbloc flow elements to create a flexible gas flow calibration platform.<\/p>\n<p>Key advantages include:<\/p>\n<ul>\n<li>Gas flow calibration from approximately 1 sccm to 6000 slm<\/li>\n<li>Measurement uncertainty down to \u00b10.125% of reading<\/li>\n<li>Compatible with molbloc-L laminar flow elements<\/li>\n<li>Compatible with molbloc-S sonic nozzle flow elements<\/li>\n<li>Q-RPT quartz reference pressure transducer technology<\/li>\n<li>Precise absolute and differential pressure measurement<\/li>\n<li>Integrated molbloc PRT temperature measurement<\/li>\n<li>Real-time gas mass flow calculation<\/li>\n<li>Standard and Premium molbloc calibration levels<\/li>\n<li>Multiple molbloc calibrations for the same gas<\/li>\n<li>High- and low-pressure molbloc operation<\/li>\n<li>Extensive gas support<\/li>\n<li>NIST REFPROP gas property data<\/li>\n<li>Special molbox1+S configurations for sonic nozzles<\/li>\n<li>Up to 10:1 range turndown with suitable molbloc-S configurations<\/li>\n<li>Optional MFC control<\/li>\n<li>RS-232 interfaces<\/li>\n<li>IEEE-488.2 communication<\/li>\n<li>COMPASS for Flow compatibility<\/li>\n<li>Suitable for manual and automated calibration<\/li>\n<li>Calibration and repair support remains available from Fluke<\/li>\n<\/ul>\n<h2>Gas Flow Calibration from 1 sccm to 6000 slm<\/h2>\n<p>One of the major advantages of the <strong>Fluke Calibration molbox1+<\/strong> is its exceptionally broad system flow range.<\/p>\n<p>Rather than incorporating one fixed internal flow sensor, the molbox1+ operates with interchangeable molbloc flow elements.<\/p>\n<p>The overall molbloc\/molbox1+ system can cover approximately:<\/p>\n<p><strong>1 sccm to 6000 slm<\/strong>.<\/p>\n<p>The actual usable range depends on:<\/p>\n<ul>\n<li>Selected molbloc<\/li>\n<li>Gas<\/li>\n<li>Operating pressure<\/li>\n<li>Calibration type<\/li>\n<li>System configuration<\/li>\n<\/ul>\n<p>Different molbloc elements can therefore be connected to the same molbox1+ to cover several decades of gas flow.<\/p>\n<h2>molbox1+ and molbloc \u2013 How the System Works<\/h2>\n<p>The <strong>Fluke Calibration molbox1+<\/strong> is the electronic measurement and calculation unit of the molbloc\/molbox system.<\/p>\n<p>It should not be confused with the actual flow element.<\/p>\n<p>The complete reference system consists of:<\/p>\n<p><strong>molbox1+ + molbloc Flow Element<\/strong><\/p>\n<p>The molbloc provides the characterized physical flow element.<\/p>\n<p>The molbox1+ measures the relevant pressure and temperature parameters and combines these measurements with the individual molbloc calibration data and gas properties.<\/p>\n<p>The resulting reference gas flow is calculated and displayed in real time.<\/p>\n<p>This modular architecture enables one flow terminal to be used with multiple reference flow elements.<\/p>\n<h2>Compatible with molbloc-L<\/h2>\n<p>The <strong>Fluke Calibration molbox1+<\/strong> is compatible with molbloc-L laminar flow elements.<\/p>\n<p>molbloc-L elements determine flow from the pressure drop created when gas passes through a precisely characterized laminar flow path.<\/p>\n<p>The molbox1+ measures the differential pressure, absolute pressure and molbloc temperature required for the flow calculation.<\/p>\n<p>Premium-calibrated molbloc-L elements used with molbox1+ provide measurement uncertainty of:<\/p>\n<p><strong>\u00b10.125% of reading from 10% to 100% FS<\/strong><\/p>\n<p>and:<\/p>\n<p><strong>\u00b10.0125% FS below 10% FS<\/strong>.<\/p>\n<p>The specified resolution is:<\/p>\n<p><strong>0.0015% FS<\/strong>.<\/p>\n<p>This combination is particularly suitable for precise low- and medium-flow gas calibration.<\/p>\n<h2>Compatible with molbloc-S<\/h2>\n<p>The molbox1+ can also be used with <strong>molbloc-S sonic nozzle flow elements<\/strong>.<\/p>\n<p>molbloc-S operates according to the critical-flow or choked-flow principle.<\/p>\n<p>Once sonic conditions are established at the nozzle throat, mass flow is primarily determined by upstream absolute pressure, gas temperature, gas properties and nozzle characteristics.<\/p>\n<p>With Premium calibration, the molbloc-S\/mobox1+ system provides measurement uncertainty down to:<\/p>\n<p><strong>\u00b10.125% of reading<\/strong>.<\/p>\n<p>The specified operating range is:<\/p>\n<p><strong>10% to 100% of molbloc full scale<\/strong>.<\/p>\n<p>Resolution is:<\/p>\n<p><strong>0.0015% FS<\/strong>.<\/p>\n<h2>Measurement Uncertainty Down to \u00b10.125%<\/h2>\n<p>The <strong>Fluke Calibration molbox1+<\/strong> was designed to significantly improve the measurement performance of the molbloc\/molbox system.<\/p>\n<p>Two molbloc calibration levels are available.<\/p>\n<p>With:<\/p>\n<p><strong>Standard Calibration<\/strong><\/p>\n<p>the specified flow measurement uncertainty is down to:<\/p>\n<p><strong>\u00b10.2% of reading<\/strong>.<\/p>\n<p>With:<\/p>\n<p><strong>Premium Calibration<\/strong><\/p>\n<p>measurement uncertainty can be reduced to:<\/p>\n<p><strong>\u00b10.125% of reading<\/strong>.<\/p>\n<p>The exact specification depends on the molbloc type, flow range, calibration gas and operating conditions.<\/p>\n<h2>Q-RPT Pressure Measurement Technology<\/h2>\n<p>The <strong>Fluke Calibration molbox1+<\/strong> uses Fluke Calibration&#8217;s:<\/p>\n<p><strong>Q-RPT \u2013 Quartz Reference Pressure Transducer<\/strong><\/p>\n<p>technology.<\/p>\n<p>Q-RPTs are specially characterized pressure sensors based on the same fundamental technology used in Fluke Calibration pressure transfer standards.<\/p>\n<p>The molbox1+ uses these reference pressure transducers to precisely determine the absolute and differential pressures required for molbloc flow calculation.<\/p>\n<p>High-quality pressure measurement is particularly important because pressure is one of the fundamental input quantities used to calculate gas flow.<\/p>\n<h2>Temperature Measurement<\/h2>\n<p>The <strong>Fluke Calibration molbox1+<\/strong> measures the PRT integrated into the connected molbloc.<\/p>\n<p>The specified temperature measurement range is:<\/p>\n<p><strong>0 \u00b0C to 40 \u00b0C<\/strong>.<\/p>\n<p>Temperature resolution is:<\/p>\n<p><strong>0.01 \u00b0C<\/strong>.<\/p>\n<p>Fluke specifies molbloc PRT precision of:<\/p>\n<p><strong>\u00b10.02 \u00b0C from 15 \u00b0C to 30 \u00b0C<\/strong>.<\/p>\n<p>The molbox1+ includes onboard 100 \u03a9 and 110 \u03a9 reference resistors with specified stability below 25 ppm per year.<\/p>\n<p>Accurate temperature measurement is essential because gas density, viscosity and other properties vary with temperature.<\/p>\n<h2>Improved molbloc-L Modeling<\/h2>\n<p>The molbox1+ introduced expanded molbloc modeling to improve the performance of molbloc-L laminar flow elements across different operating pressures.<\/p>\n<p>This makes it possible to use the same molbloc more flexibly in different calibration configurations.<\/p>\n<p>The system can store multiple calibrations for each gas.<\/p>\n<p>For example, the same molbloc can be calibrated for:<\/p>\n<p><strong>low-pressure operation<\/strong><\/p>\n<p>and:<\/p>\n<p><strong>high-pressure operation<\/strong>.<\/p>\n<p>The required calibration is then selected from the molbox1+ front panel or through the remote interface.<\/p>\n<h2>Multiple Calibrations Stored in the molbloc<\/h2>\n<p>Individual calibration information is stored in the molbloc EEPROM.<\/p>\n<p>The <strong>Fluke Calibration molbox1+<\/strong> can access multiple calibration types for the same gas.<\/p>\n<p>This eliminates the need to manually load separate calibration files whenever the operating pressure configuration changes.<\/p>\n<p>The feature is particularly useful in laboratories where the same molbloc is used both upstream and downstream of different devices under test.<\/p>\n<h2>Extensive Gas Support<\/h2>\n<p>The <strong>Fluke Calibration molbox1+<\/strong> supports a broad range of gases.<\/p>\n<p>These include:<\/p>\n<ul>\n<li>Nitrogen \u2013 N\u2082<\/li>\n<li>Air<\/li>\n<li>Argon \u2013 Ar<\/li>\n<li>Carbon monoxide \u2013 CO<\/li>\n<li>Helium \u2013 He<\/li>\n<li>Oxygen \u2013 O\u2082<\/li>\n<li>Carbon dioxide \u2013 CO\u2082<\/li>\n<li>Carbon tetrafluoride \u2013 CF\u2084<\/li>\n<li>Ethane \u2013 C\u2082H\u2086<\/li>\n<li>Ethylene \u2013 C\u2082H\u2084<\/li>\n<li>Fluoroform \u2013 CHF\u2083<\/li>\n<li>Hexafluoroethane \u2013 C\u2082F\u2086<\/li>\n<li>Hydrogen \u2013 H\u2082<\/li>\n<li>Methane \u2013 CH\u2084<\/li>\n<li>Nitrous oxide \u2013 N\u2082O<\/li>\n<li>Propane \u2013 C\u2083H\u2088<\/li>\n<li>Sulfur hexafluoride \u2013 SF\u2086<\/li>\n<li>Butane \u2013 C\u2084H\u2081\u2080<\/li>\n<li>Octafluorocyclobutane \u2013 C\u2084F\u2088<\/li>\n<li>Xenon \u2013 Xe<\/li>\n<\/ul>\n<p>The availability of individual manufacturer calibrations depends on the selected molbloc, gas and operating conditions.<\/p>\n<h2>NIST REFPROP Gas Properties<\/h2>\n<p>Accurate gas property data is essential for high-performance gas flow measurement.<\/p>\n<p>The molbox1+ generation incorporates improved gas property data based on the:<\/p>\n<p><strong>NIST Reference Fluid Thermodynamic and Transport Properties Database \u2013 REFPROP<\/strong>.<\/p>\n<p>These data are used in the calculation of important gas properties required for flow determination.<\/p>\n<p>Combined with improved molbloc modeling and the Fluke Calibration gravimetric flow calibration chain, this contributes to the low measurement uncertainty of the molbox1+ system.<\/p>\n<h2>molbox1+S for Sonic Nozzle Applications<\/h2>\n<p>Fluke Calibration also developed the:<\/p>\n<p><strong>molbox1+S<\/strong><\/p>\n<p>specifically for molbloc-S sonic nozzle applications.<\/p>\n<p>Unlike the standard molbox1+, the molbox1+S is configured for absolute pressure measurement and is optimized for operation at higher upstream pressures.<\/p>\n<p>Two versions were offered:<\/p>\n<p><strong>molbox1+S A1.4M<\/strong><\/p>\n<p>with a maximum upstream pressure range of approximately:<\/p>\n<p><strong>1.4 MPa \/ 200 psia<\/strong><\/p>\n<p>and:<\/p>\n<p><strong>molbox1+S A2M<\/strong><\/p>\n<p>with a range up to:<\/p>\n<p><strong>2 MPa \/ 300 psia<\/strong>.<\/p>\n<p>These versions are designed for molbloc-S only.<\/p>\n<h2>Up to 10:1 molbloc-S Rangeability<\/h2>\n<p>The higher upstream pressure capability of molbox1+S can significantly extend the usable flow range of a molbloc-S.<\/p>\n<p>Fluke describes a potential:<\/p>\n<p><strong>10:1 range turndown<\/strong>.<\/p>\n<p>For example, with a device under test operating at atmospheric pressure, a:<\/p>\n<p><strong>1E2-S<\/strong><\/p>\n<p>may provide approximately:<\/p>\n<p><strong>15 to 50 slm<\/strong><\/p>\n<p>with Standard Pressure calibration and a molbox1 A700K.<\/p>\n<p>With High Pressure calibration and molbox1+S A2M, the range can increase to approximately:<\/p>\n<p><strong>20 to 200 slm<\/strong>.<\/p>\n<p>For a:<\/p>\n<p><strong>5E2-S<\/strong><\/p>\n<p>the corresponding range can increase from approximately:<\/p>\n<p><strong>67 to 250 slm<\/strong><\/p>\n<p>to:<\/p>\n<p><strong>100 to 1000 slm<\/strong>.<\/p>\n<p>This can reduce the number of molbloc-S elements required for a broad calibration range.<\/p>\n<h2>molbox1+ A350K<\/h2>\n<p>The:<\/p>\n<p><strong>molbox1+ A350K<\/strong><\/p>\n<p>is a:<\/p>\n<p><strong>350 kPa \/ 50 psia Flow Terminal<\/strong>.<\/p>\n<p>It is designed for use with:<\/p>\n<ul>\n<li>molbloc-L<\/li>\n<li>molbloc-S<\/li>\n<\/ul>\n<p>This version is suitable for systems whose operating pressure requirements remain within the corresponding Q-RPT range.<\/p>\n<h2>molbox1+ A700K<\/h2>\n<p>The:<\/p>\n<p><strong>molbox1+ A700K<\/strong><\/p>\n<p>provides a:<\/p>\n<p><strong>700 kPa \/ 100 psia Flow Terminal<\/strong>.<\/p>\n<p>Like the A350K, it supports both:<\/p>\n<ul>\n<li>molbloc-L<\/li>\n<li>molbloc-S<\/li>\n<\/ul>\n<p>The higher pressure capability provides additional flexibility for gas flow calibration systems.<\/p>\n<h2>molbox1+S A1.4M<\/h2>\n<p>The:<\/p>\n<p><strong>molbox1+S A1.4M<\/strong><\/p>\n<p>is specifically designed for sonic nozzle applications.<\/p>\n<p>It provides an absolute pressure range up to approximately:<\/p>\n<p><strong>1.4 MPa \/ 200 psia<\/strong>.<\/p>\n<p>This configuration is intended for:<\/p>\n<p><strong>molbloc-S only<\/strong>.<\/p>\n<h2>molbox1+S A2M<\/h2>\n<p>The:<\/p>\n<p><strong>molbox1+S A2M<\/strong><\/p>\n<p>extends the absolute pressure capability to:<\/p>\n<p><strong>2 MPa \/ 300 psia<\/strong>.<\/p>\n<p>It is also designed exclusively for:<\/p>\n<p><strong>molbloc-S sonic nozzle flow elements<\/strong>.<\/p>\n<p>The increased pressure range provides significantly greater flow rangeability for suitable molbloc-S configurations.<\/p>\n<h2>Optional MFC Control<\/h2>\n<p>The <strong>Fluke Calibration molbox1+<\/strong> was available with an integrated:<\/p>\n<p><strong>MFC Control Option<\/strong>.<\/p>\n<p>This optional board allows analog mass flow controllers to be set and read directly through the molbox1+.<\/p>\n<p>Both voltage- and current-based MFC signals are supported.<\/p>\n<p>This capability can reduce the amount of additional instrumentation required to create a complete mass flow controller calibration system.<\/p>\n<h2>MFC Switchbox<\/h2>\n<p>The molbox1+ can also be combined with the:<\/p>\n<p><strong>Fluke Calibration MFC Switchbox<\/strong>.<\/p>\n<p>The switchbox provides connections for up to five mass flow controllers.<\/p>\n<p>It supports applications where one MFC is used to control the flow while other connected devices are measured or calibrated.<\/p>\n<p>This is particularly useful in automated multi-device calibration systems.<\/p>\n<h2>COMPASS for Flow<\/h2>\n<p>The <strong>Fluke Calibration molbox1+<\/strong> is supported by:<\/p>\n<p><strong>COMPASS for Flow<\/strong><\/p>\n<p>calibration software.<\/p>\n<p>COMPASS for Flow can automate many aspects of gas flow calibration.<\/p>\n<p>Functions can include:<\/p>\n<ul>\n<li>DUT configuration<\/li>\n<li>Calibration procedure definition<\/li>\n<li>Automatic test execution<\/li>\n<li>Reference data acquisition<\/li>\n<li>DUT data acquisition<\/li>\n<li>Flow control<\/li>\n<li>Calculation of corrected flow values<\/li>\n<li>Calibration report generation<\/li>\n<li>Data storage<\/li>\n<li>MET\/TRACK data export<\/li>\n<li>Macro-based automation<\/li>\n<\/ul>\n<p>This allows molbox1+ systems to be integrated into sophisticated automated calibration laboratories.<\/p>\n<h2>Communication Interfaces<\/h2>\n<p>The <strong>Fluke Calibration molbox1+<\/strong> provides:<\/p>\n<ul>\n<li>RS-232 COM1<\/li>\n<li>RS-232 COM2<\/li>\n<li>IEEE-488.2<\/li>\n<\/ul>\n<p>These interfaces support communication with computers, calibration software and other laboratory equipment.<\/p>\n<p>Remote operation allows the molbox1+ to form part of an automated calibration system.<\/p>\n<h2>General Specifications<\/h2>\n<p>The molbox1+ has a normal operating temperature range of:<\/p>\n<p><strong>15 \u00b0C to 30 \u00b0C<\/strong>.<\/p>\n<p>Storage temperature range is:<\/p>\n<p><strong>-20 \u00b0C to 70 \u00b0C<\/strong>.<\/p>\n<p>Power requirements are:<\/p>\n<p><strong>85 V AC to 264 V AC<\/strong><\/p>\n<p>at:<\/p>\n<p><strong>47 Hz to 440 Hz<\/strong>.<\/p>\n<p>Maximum power consumption is approximately:<\/p>\n<p><strong>18 VA<\/strong>.<\/p>\n<p>The instrument dimensions are approximately:<\/p>\n<p><strong>32 \u00d7 12 \u00d7 30 cm<\/strong>.<\/p>\n<p>Maximum weight is approximately:<\/p>\n<p><strong>6.8 kg<\/strong>.<\/p>\n<h2>Technical Highlights<\/h2>\n<table>\n<tbody>\n<tr>\n<th>Feature<\/th>\n<th>Fluke Calibration molbox1+<\/th>\n<\/tr>\n<tr>\n<td>Device type<\/td>\n<td>Gas Flow Terminal<\/td>\n<\/tr>\n<tr>\n<td>Product status<\/td>\n<td>Discontinued<\/td>\n<\/tr>\n<tr>\n<td>Recommended successor<\/td>\n<td>Fluke Calibration molbox2<\/td>\n<\/tr>\n<tr>\n<td>Compatible flow elements<\/td>\n<td>molbloc-L and molbloc-S<\/td>\n<\/tr>\n<tr>\n<td>Overall system flow range<\/td>\n<td>Approx. 1 sccm to 6000 slm<\/td>\n<\/tr>\n<tr>\n<td>Premium measurement uncertainty<\/td>\n<td>Down to \u00b10.125% of reading<\/td>\n<\/tr>\n<tr>\n<td>Standard measurement uncertainty<\/td>\n<td>Down to \u00b10.2% of reading<\/td>\n<\/tr>\n<tr>\n<td>molbloc-L range<\/td>\n<td>0 to 100% FS<\/td>\n<\/tr>\n<tr>\n<td>molbloc-S range<\/td>\n<td>10 to 100% FS<\/td>\n<\/tr>\n<tr>\n<td>Flow measurement rate<\/td>\n<td>1 second<\/td>\n<\/tr>\n<tr>\n<td>Pressure technology<\/td>\n<td>Q-RPT<\/td>\n<\/tr>\n<tr>\n<td>Temperature range<\/td>\n<td>0 \u00b0C to 40 \u00b0C<\/td>\n<\/tr>\n<tr>\n<td>Temperature resolution<\/td>\n<td>0.01 \u00b0C<\/td>\n<\/tr>\n<tr>\n<td>molbloc PRT precision<\/td>\n<td>\u00b10.02 \u00b0C from 15 to 30 \u00b0C<\/td>\n<\/tr>\n<tr>\n<td>Standard versions<\/td>\n<td>A350K \/ A700K<\/td>\n<\/tr>\n<tr>\n<td>Sonic versions<\/td>\n<td>molbox1+S A1.4M \/ A2M<\/td>\n<\/tr>\n<tr>\n<td>Maximum molbox1+S pressure<\/td>\n<td>2 MPa absolute<\/td>\n<\/tr>\n<tr>\n<td>MFC control<\/td>\n<td>Optional<\/td>\n<\/tr>\n<tr>\n<td>Communication<\/td>\n<td>2 \u00d7 RS-232, IEEE-488.2<\/td>\n<\/tr>\n<tr>\n<td>Software<\/td>\n<td>COMPASS for Flow \/ COMPASS for molbox<\/td>\n<\/tr>\n<tr>\n<td>Operating temperature<\/td>\n<td>15 \u00b0C to 30 \u00b0C<\/td>\n<\/tr>\n<tr>\n<td>Dimensions<\/td>\n<td>Approx. 32 \u00d7 12 \u00d7 30 cm<\/td>\n<\/tr>\n<tr>\n<td>Weight<\/td>\n<td>Approx. 6.8 kg<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>molbox1+ vs. molbox RFM<\/h2>\n<p>The <strong>Fluke Calibration molbox1+<\/strong> represents a significant development over the earlier molbox RFM generation.<\/p>\n<p>Both systems operate with interchangeable molbloc flow elements.<\/p>\n<p>However, the molbox1+ introduced:<\/p>\n<ul>\n<li>Q-RPT reference pressure technology<\/li>\n<li>Improved measurement uncertainty<\/li>\n<li>Premium molbloc calibration<\/li>\n<li>Expanded molbloc modeling<\/li>\n<li>Improved gas property data<\/li>\n<li>Multiple calibrations per gas<\/li>\n<li>Higher-pressure sonic nozzle configurations<\/li>\n<li>Improved automation capabilities<\/li>\n<\/ul>\n<p>With Premium molbloc calibration, the molbox1+ can achieve measurement uncertainty down to:<\/p>\n<p><strong>\u00b10.125% of reading<\/strong>.<\/p>\n<p>This represents a substantial improvement compared with earlier molbox RFM systems.<\/p>\n<h2>molbox1+ vs. molbox2<\/h2>\n<p>The <strong>Fluke Calibration molbox1+ is no longer manufactured<\/strong>.<\/p>\n<p>For new systems, Fluke Calibration currently recommends the:<\/p>\n<p><strong>Fluke Calibration molbox2 Flow Terminal<\/strong>.<\/p>\n<p>The molbox2 continues the modular molbloc\/molbox concept while providing the current generation of Fluke Calibration gas flow measurement technology.<\/p>\n<p>Existing molbox1+ systems nevertheless remain relevant for established calibration installations.<\/p>\n<p>Fluke Calibration currently lists the molbox1+ among the flow calibration products for which calibration and repair support is available.<\/p>\n<h2>Typical Applications<\/h2>\n<p>The <strong>Fluke Calibration molbox1+<\/strong> is suitable 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>Gas flow sensor calibration<\/li>\n<li>Critical flow device calibration<\/li>\n<li>Process gas flow calibration<\/li>\n<li>Semiconductor applications<\/li>\n<li>Pharmaceutical production<\/li>\n<li>Environmental monitoring<\/li>\n<li>Aerospace<\/li>\n<li>Energy applications<\/li>\n<li>Research and development<\/li>\n<li>Calibration laboratories<\/li>\n<li>Automated flow calibration<\/li>\n<li>Gas flow metrology<\/li>\n<\/ul>\n<h2>Why Choose the Fluke Calibration molbox1+?<\/h2>\n<p>The <strong>Fluke Calibration molbox1+<\/strong> combines precise Q-RPT pressure measurement, molbloc temperature measurement and sophisticated gas property calculations with the modular flexibility of interchangeable molbloc-L and molbloc-S flow elements.<\/p>\n<p>The complete system can cover gas flows from approximately <strong>1 sccm to 6000 slm<\/strong>, depending on the selected molbloc and operating configuration.<\/p>\n<p>With Premium molbloc calibration, measurement uncertainty can be as low as <strong>\u00b10.125% of reading<\/strong>.<\/p>\n<p>Standard A350K and A700K configurations support both molbloc-L and molbloc-S elements, while the specialized molbox1+S A1.4M and A2M versions extend the operating pressure for sonic nozzle applications.<\/p>\n<p>Optional MFC control and COMPASS for Flow software enable the molbox1+ to form the basis of a highly automated mass flow calibration system.<\/p>\n<p>Although the <strong>Fluke Calibration molbox1+ is discontinued<\/strong>, Fluke continues to provide calibration and repair support for the instrument. For new calibration systems, the current <strong>Fluke Calibration molbox2<\/strong> should be considered as the recommended successor.<\/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 molbox1+<\/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-molbox1-Flow-Terminal.pdf\"><span style=\"color: #0000ff;\"><strong><em>Download Datasheet<\/em><\/strong><\/span><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>The <strong>Fluke Calibration molbox1+<\/strong> is a precise gas flow terminal for professional calibration with molbloc-L and molbloc-S flow elements. The complete system covers flow rates from approximately <strong>1 sccm to 6000 slm<\/strong> with measurement uncertainty down to <strong>\u00b10.125% of reading<\/strong> using Premium molbloc calibration. Q-RPT pressure technology, multiple gas calibrations and optional MFC control make it a powerful platform for professional gas flow calibration. The molbox1+ is discontinued and has been succeeded by the Fluke Calibration molbox2.<\/p>\n","protected":false},"featured_media":3162,"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":[5325,5378,5326,5327,5379,5380,5381,5330,5382,3922,5332,5333,5349,5334,5336,5383,5337,5338,5363,5350],"class_list":["post-6663","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-durchflusskalibrator","product_tag-durchflussmesstechnik","product_tag-durchflussnormal","product_tag-flow-calibration","product_tag-fluke-calibration-molbox1","product_tag-fluke-molbox1","product_tag-gasdurchflusskalibrierung","product_tag-gasmassenstrom","product_tag-kalibrierlabor","product_tag-mass-flow-controller-kalibrieren","product_tag-massedurchfluss-messsystem","product_tag-massedurchflusskalibrierung","product_tag-massedurchflussmesser-kalibrieren","product_tag-mfc-kalibrierung","product_tag-molbloc","product_tag-molbloc-l","product_tag-molbloc-s","product_tag-molbox","product_tag-molbox1","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\/6663","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\/3162"}],"wp:attachment":[{"href":"https:\/\/europascal.de\/en\/wp-json\/wp\/v2\/media?parent=6663"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/europascal.de\/en\/wp-json\/wp\/v2\/product_brand?post=6663"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/europascal.de\/en\/wp-json\/wp\/v2\/product_cat?post=6663"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/europascal.de\/en\/wp-json\/wp\/v2\/product_tag?post=6663"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}