Download RFM DN-2400E Specifications

molbox™ RFM™ OPERATION AND MAINTENANCE MANUAL
1.2.4.1.1
molbloc-L FLOW MEASUREMENT
SPECIFICATIONS, MICRORANGE OPTION
The microrange option (see Section 1.2.2.2) improves molbloc-L flow
measurement specifications below 10 % FS of the molbloc range. With the
microrange option, the affected measurement specifications below 10 % FS
become:
Resolution
Linearity
Repeatability
Precision
1
2
Stability
(1 year)
3
Measurement Uncertainty
(1 year, N2 and any molbox RFM
supported gas for which the molbloc in
use is calibrated)
0.01 % of 10 % FS (0.001 % FS)
± 0.23 % of reading from 1 to 10 % FS
± 0.1 % of reading from 1 to 10 % FS
± 0.25 % of reading from 1 to 10 % FS
± 0.15 % of reading from 1 to 10 % FS
± 0.5 % of reading from 1 to 10 % FS
1 Precision: Combined linearity, hysteresis, repeatability.
2 Stability: Maximum change in zero and span over specified time period for typical molbox RFM and
molbloc used under typical conditions. As stability can only be predicted, stability for a specific
molbox RFM should be established from experience.
3 Measurement Uncertainty (Accuracy): Maximum deviation of the molbox RFM flow indication from
the true value of the flow through the molbloc including precision, stability and DHI calibration
standard measurement uncertainty.
1.2.4.1.2
molbloc-L PRESSURE DEPENDENT CALIBRATION
TYPES
See your molbloc’s Calibration Report to determine the calibration type of
the molbloc you are using.
Different pressure dependent calibration options for molbloc-L elements determine
the range of operating pressures over which a molbloc can be used within its
mass flow measurement specifications. The calibration option also affects the
molbloc flow range and the differential pressure associated with the flow range.
Measurement uncertainty (accuracy) specifications for molbloc-L are valid only
for gases with which the molbloc has been calibrated. All molbloc-L elements
are calibrated for N2. Calibrations with other gases are optional. DHI calibration
capability is not maintained at all times for all gases on all molbloc designations.
Check for availability before ordering calibrations.
© 1998-2007 DH Instruments, a Fluke Company
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