molbloc-Ls are laminar flow elements for use with molbox mass flow terminals. The molbloc flow path is the longitudinal, annular gap between a piston and a close fitting cylindrical bore in the molbloc body. Different molbloc ranges are obtained by varying the size of the gap. For high flow ranges (size 1E4 and above), a larger molbloc body with a larger cylindrical bore is used.
Features at a glance
Useable with existing molbox1+ and molbox RFM mass flow terminals and COMPASS software
Integrated filter to protect against contamination
Integral gas temperature conditioning and measurement
Continuous, real-time reading
Can be fully automated
No moving parts
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Specifications - Standard molbloc-L
Calibrations - Used with molbox1+ terminal
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Measurement Update Rate
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1 second
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Range
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0 to molbloc full scale depending on
gas and molbloc pressure
dependent calibration type (see Section 1.2.5.1.3)
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Resolution
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0.0015 % FS
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Linearity
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± 0.05 % of reading from 10 to 100 %
FS,
± 0.005 % FS under 10 % FS
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Repeatability
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± 0.05 % of reading from 10 to 100 %
FS,
± 0.005 % FS under 10 % FS
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Precision1
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± 0.07 % of reading from 10 to 100 %
FS,
± 0.007 % FS under 10 % FS
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Stability2
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± 0.09 % of reading from 10 to 100 %
FS,
± 0.009 % FS under 10 % FS
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Measurement Uncertainty3
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± 0.2 % of reading from 10 to 100 %
FS,
± 0.02 % FS under 10 % FS
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(N2 and any molbox1+ supported gas
for which the molbloc in use is calibrated)
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1E5 molbloc
± 0.5% of reading from 25 to 100 % FS,
± 0.125 % FS under 25 % FS
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1 Precision: Combined linearity,
hysteresis, and repeatability.
2 Stability: Maximum change in zero and span over specified time period for
typical molbox1+ and molbloc used under typical conditions. As stability can
only be predicted, stability for a specific molbloc and molbox1+ should be
established from experience.
3 Measurement uncertainty (accuracy): Maximum deviation of the molbox1+ flow
indication from the true value of the flow through the molbloc including
precision, stability and Fluke calibration standard measurement uncertainty.
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Model Name
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Description
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1E1 VCR-V-Q
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1E1 VCR-V-Q
molbloc Mass Flow Element
Each molbloc is delivered complete with: Storage and shipping case
Soft, reusable VCR O-rings and mounting instructions
Full mod, low pressure Nitrogen (N2) calibration.
A different N2 calibration and/or calibration with non-N2 gases must be
ordered as separate line item.
Calibration report documenting traceability to the United States National
Institute of Standards and Technology (NIST) and reporting measured
calibration data
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5E1 VCR-V-Q
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molbloc Mass Flow Element
Each molbloc is delivered complete with:
Storage and shipping case
Soft, reusable VCR O-rings and mounting instructions
Full mod, low pressure Nitrogen (N2) calibration.
A different N2 calibration and/or calibration with non-N2 gases must be
ordered as separate line item.
Calibration report documenting traceability to the United States National
Institute of Standards and Technology (NIST) and reporting measured
calibration data
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1E2 VCR-V-Q
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molbloc Mass Flow Element
Each molbloc is delivered complete with:
Storage and shipping case
Soft, reusable VCR O-rings and mounting instructions
Full mod, low pressure Nitrogen (N2) calibration.
A different N2 calibration and/or calibration with non-N2 gases must be
ordered as separate line item.
Calibration report documenting traceability to the United States National
Institute of Standards and Technology (NIST) and reporting measured
calibration data
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2E2 VCR-V-Q
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molbloc Mass Flow Element
Each molbloc is delivered complete with:
Storage and shipping case
Soft, reusable VCR O-rings and mounting instructions
Full mod, low pressure Nitrogen (N2) calibration.
A different N2 calibration and/or calibration with non-N2 gases must be
ordered as separate line item.
Calibration report documenting traceability to the United States National
Institute of Standards and Technology (NIST) and reporting measured
calibration data
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5E2 VCR-V-Q
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molbloc Mass Flow Element
Each molbloc is delivered complete with:
Storage and shipping case
Soft, reusable VCR O-rings and mounting instructions
Full mod, low pressure Nitrogen (N2) calibration.
A different N2 calibration and/or calibration with non-N2 gases must be
ordered as separate line item.
Calibration report documenting traceability to the United States National
Institute of Standards and Technology (NIST) and reporting measured
calibration data
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1E3 VCR-V-Q
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molbloc Mass Flow Element
Each molbloc is delivered complete with:
Storage and shipping case
Soft, reusable VCR O-rings and mounting instructions
Full mod, low pressure Nitrogen (N2) calibration.
A different N2 calibration and/or calibration with non-N2 gases must be
ordered as separate line item.
Calibration report documenting traceability to the United States National
Institute of Standards and Technology (NIST) and reporting measured
calibration data
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