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MOLBOX1+™/MOLBOX1+S, MOLBLOC TERMINAL OPERATION AND MAINTENANCE MANUAL
For easy identification, new molbox1+ terminals are produced with serial numbers of 2000 and higher.
Older molbox1 terminals may be eligible for upgrade to molbox1+ hardware, software and specifications
by Fluke/DHI.
1.1.1
molbloc Flow Elements
Two different types of molblocs may be used with molbox1+; molbloc-L (laminar) and
molbloc-S (sonic).
the updated data structure to take advantage of molbox1+ version 6.00 or later features, and
also supports operation with older molblocs that do not have a version 6.00 data format.
Premium calibrations and associated specifications are only an option for molblocs that have
the version 6.00 format.
1.1.1.1
molbloc-L is the original molbloc laminar flow element. molbloc-L covers the
lower portion of the molbloc/molbox1+ system flow range. The key molbloc-L
measurement is the differential pressure across the element, which is roughly
proportional to the mass flow rate through it. molbloc-L elements are calibrated
to be used at an absolute pressure which remains nearly constant, while the
differential pressure varies with flow rate. Different operating pressure options
and their effect on molbloc flow range are described in Section 1.2.5.1.1.
In addition to the new data structure and modelization methods that became
available for molblocs with the introduction of molbox1+, all molbloc-L elements
of range 1E1-L to 3E4-L produced or upgraded after the release of molbox1+ are
equipped standard with an upstream ¼" VCR flange, or flowpath connection, that
has an integrated sintered metal filter. This filter is intended to be a last defense
against particulate contamination of the molbloc-L internal flowpath which can
affect molbloc-L measurements. Every effort should still be made to supply clean
dry gas to the molbloc to ensure its measurement performance and long-term
stability. molblocs that have the integrated upstream filter are recognizable by
the visible filter element as shown below.
New molbloc-L elements produced with molbox1+ calibration data structure,
premium calibration options, and integrated filter hardware can be identified by
having a serial number of 6000 or higher. Most older molbloc-L elements are
eligible for upgrade to this hardware/version 6.00 format by Fluke/DHI.
© 1995 - 2010 Fluke Corporation, DH Instruments Division
molbox1+ supports operation with new or upgraded molblocs that have
molbloc-L Flow Element
Figure 1: molbloc-L Upstream End Flange with Integrated Filter
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