Molbloc Flow Elements
Molbloc-S Sonic Flow Element

–  Covers ranges up to 5 000 slm in N2 and air
–  Useable with existing molbox1 and molbox RFM mass flow terminals and COMPASS software
– Proven critical flow venturi (sonic) nozzle operating principle supported by gravimetric calibration
– Minimal sensitivity to contamination
– Measurement uncertainty: ? 0.2 % of reading with molbox1 ? 0.5 % of reading with molbox RFM
– Air and N2 calibrations available, humid air density compensation supports use with ambient air
– Excellent rangeability using full molbox pressure range; 10:1 turndown with vacuum downstream; new 350 kPa full scale molbox1 available for low pressure operation
– Redundant absolute upstream pressure measurement using both molbox absolute pressure transducers reduces uncertainty and increases reliability
– Integral gas temperature conditioning and measurement
– Continuous, real-time reading, as with traditional molbloc-L laminar element
– Can be fully automated


molbloc-S? is a high precision transfer standard intended for calibrating other transfer standards or process flow meters and controllers. molbloc-S is used with molbox1? or molbox RFM? terminals to extend the range of molbloc/molbox ? calibration systems and deliver superior accuracy at medium and high flows. Existing molbox1 terminals with version 4.0 embedded software or later and all molbox RFM terminals are user upgradable for use with molbloc-S.