Flow calibrator molbloc-L

Product overview
Fluke Calibration provides laminar flow elements (molbloc-L) for flows from 1 sccm to 100 slm. Molblocs are designed to be used with molbox mass flow terminals and COMPASS software to provide traceable mass flow transfer standards.

Key features

• Flow ranging from 1 sccm to 100 slm.
• Molbloc flow path is the gap between a piston and a close-fitting cylindrical bore in the molbloc body.
• Different flow ranges are achieved by varying the size of the gap; larger bodies are used for higher flow ranges.

Features at a glance

• Compatible with molbox1+, molbox2, molbox RFM terminals and COMPASS software.
• Integrated filter to protect against contamination.
• Integral gas temperature conditioning and measurement.
• Continuous, real-time reading and full automation capability.
• No moving parts.

molbloc-L Ranges
Molbloc sizes are designated by a number relative to nominal flow impedance. Nominal impedance yields nominal flow ranges when flowing nitrogen with 250 kPa absolute upstream pressure and 50 kPa differential across the molbloc. Actual flow ranges depend on gas density/viscosity and chosen molbloc operating pressure calibration options.

Models (selection shown on page)

• 1E1 VCR-V-Q
• 5E1 VCR-V-Q
• 1E2 VCR-V-Q
• 2E2 VCR-V-Q
• 5E2 VCR-V-Q
• 1E3 VCR-V-Q
• 5E3 VCR-V-Q
• 1E4 VCR-V-Q
• 3E4 VCR-V-Q
• 1E5 VCR-V-Q

Included with each molbloc (common delivery items)

• Storage and shipping case.
• Soft, reusable VCR O-rings and mounting instructions.
• Full-range, low-pressure Nitrogen (N2) calibration by default (other calibrations or gases ordered separately).
• Calibration report documenting traceability to NIST and measured calibration data.

Specifications - Standard molbloc-L Calibrations (used with molbox1+ and molbox2)

• Measurement update rate: 1 second.
• Range: 0 to molbloc full scale depending on gas and molbloc pressure (calibration dependent).
• Resolution: 0.0015 % FS.
• Linearity: ±0.05 % of reading (10–100 % FS); ±0.005 % FS under 10 % FS.
• Repeatability: ±0.05 % of reading (10–100 % FS); ±0.005 % FS under 10 % FS.
• Precision¹: ±0.07 % of reading (10–100 % FS); ±0.007 % FS under 10 % FS.
• Stability² (1 year): ±0.09 % of reading (10–100 % FS); ±0.009 % FS under 10 % FS.
• Measurement uncertainty³: ±0.2 % of reading (10–100 % FS); ±0.02 % FS under 10 % FS.
• Example (1E5 molbloc, N2/molbox-supported gas): ±0.5 % of reading (25–100 % FS); ±0.125 % FS under 25 % FS.

Specifications - Premium molbloc-L Calibrations (used with molbox1+)

• Measurement update rate: 1 second.
• Range: 0 to molbloc full scale depending on gas and molbloc pressure (calibration dependent).
• Resolution: 0.0015 % FS.
• Linearity & repeatability: ±0.05 % of reading (10–100 % FS); ±0.005 % FS under 10 % FS.
• Precision¹: ±0.07 % of reading (10–100 % FS); ±0.007 % FS under 10 % FS.
• Stability² (1 year): ±0.03 % of reading (10–100 % FS); ±0.003 % FS under 10 % FS.
• Measurement uncertainty³: ±0.125 % of reading (10–100 % FS); ±0.0125 % FS under 10 % FS.

Specifications - Standard molbloc-L Calibrations (used with molbox RFM)

• Covered ranges: molbloc-L (1E1-L to 3E4-L).
• Measurement update rate: 1 second.
• Resolution: 0.01 % FS.
• Linearity: ±0.23 % of reading (10–100 % FS); ±0.023 % FS under 10 % FS.
• Repeatability: ±0.1 % of reading (10–100 % FS); ±0.01 % FS under 10 % FS.
• Precision¹: ±0.25 % of reading (10–100 % FS); ±0.025 % FS under 10 % FS.
• Stability² (1 year): ±0.15 % of reading (10–100 % FS); ±0.015 % FS under 10 % FS.
• Measurement uncertainty³: ±0.5 % of reading (10–100 % FS); ±0.05 % FS under 10 % FS.

Notes

• ¹Precision = combined linearity, hysteresis, repeatability.
• ²Stability = maximum change in zero and span over specified time for a typical molbloc + molbox; actual values should be confirmed from experience.
• ³Measurement uncertainty (accuracy) = maximum deviation of the indicated flow from true flow, including precision, stability and Fluke calibration standard uncertainty.

Technical characteristics / specifications

• Product: molbloc-L Laminar Flow Element (mass flow transfer standard).
• Measurement update rate: 1 s.
• Flow capability: nominally 1 sccm up to 100 slm (depends on molbloc size and calibration options).
• Resolution: 0.0015 % FS (typical high-precision calibrations).
• Typical precision (standard/premium): ±0.07 % reading (10–100 % FS); improved stability and uncertainty available with premium calibration.
• Mechanical: flow path defined by piston-to-bore gap; multiple sizes to cover flow ranges; mounting systems available.
• Compatibility: used with molbox1+, molbox2, molbox RFM and COMPASS software.
• Delivery: storage case, reusable VCR O-rings, mounting instructions, standard N2 calibration and traceable calibration report.