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The <4vlm> unit selection embeds the selection "vlm" into the
UNIT function rather than a specific volume unit. The "vlm"
selection provides access to all the volume flow units.
summary the unit types are:
<1std> (standard): mass flow units for which "standard"
conditions are temperature of 0 °C, standard atmosphere and
using the true compressibility factor of the gas.
<2user>: mass flow units for which "standard" conditions are a
user settable temperature, standard atmosphere and using the
true compressibility factor of the gas.
<3perfect>: mass flow units for which "standard" conditions are
temperature of 0 °C, standard atmosphere and assuming a
compressibility factor of 1 for all gases.
<4vlm>: volume flow units.
See Sections 3.4.3.1 to 3.4.3.4 for additional information on flow
unit types.
3.4.4
[TARE]
PURPOSE
[TARE] accesses five functions.
•
TARE function:
To zero the molbox1+ differential pressure readings in molbloc-L
operation or verify the two RPTs by comparing them against each other in molbloc-S
mode (see Section 3.4.4.1).
•
PURGE function: To purge the molbloc connecting lines and molbox1+ internal volume of a
first gas with a second gas by flowing the second gas through the molbox1+ (see Section
3.4.4.2).
•
LEAK CHECK function: To check the molbox1+ internal pneumatic circuit and/or the
external test circuit to which molbox1+ is connected, for leaks (see Section 3.4.4.3).
•
AUTOZ function: To periodically offset the molbox1+ RPTs relative to a reference
pressure value in order to compensate for possible changes in the RPT zero between full
recalibrations (see Section 3.4.4.4).
•
BPR function (present only in molbloc-S operation): To measure and display the
molbloc-S back pressure ratio (BPR) while operating in a BPR mode which does not
continuously read and display BPR (see Section 3.4.4.5).
OPERATION
Pressing [TARE] accesses a display with the choice of four
functions (five functions in molbloc-S operation). Select the
desired function.
See the following for principles and
operation:
Some screens (e.g., the Tare menu) may go beyond the two lines provided
by the display. This is indicated by a flashing arrow in the second line of
the display. Press the [←] and [→] keys to move the cursor to access the
lines that are NOT visible or directly enter the number of the hidden menu
choice if you know it.
Note
Note
Page 51
© 1995 - 2010 Fluke Corporation, DH Instruments Division
3. OPERATION
In
1tare 2purge
3leak check 4AutoZ ↓
5BPR
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