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<#1> corresponds to the first of the six
available selections under the UNIT
function.
selection that you would like to change.
The display becomes:
Select the flow unit type of the desired flow unit (see Table 11). Then select the
desired unit.
<1mol/s>
<2kg/s>
<3mg/s>
<4slm>
<5sccm>
<6scfm>
<7scfh>
<8slh>
<9sm3h>
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
of the volume flow units. In summary the unit types are:
<1std> (standard):
<2user>:
<3perfect>:
<4vlm>:
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 molbox RFM differential pressure readings during
molbloc-L operation or verify the two RPTs by comparing them against each other during
molbloc-S operation (see Section 3.4.4.1).
•
PURGE function: To purge the molbloc connecting lines and molbox RFM internal volume
of a first gas with a second gas by flowing the second gas through the molbox RFM (see Section
3.4.4.2).
•
LEAK CHECK function: To check the molbox RFM internal pneumatic circuit and/or the
external test circuit to which molbox RFM is connected, for leaks (see Section 3.4.4.3).
Enter the number of the
Table 11. Available Flow Units
<1std>
<2user>
<1ulm>
<2uccm>
<3ucfm>
<4ucfh>
<5um3h>
mass flow units for which "standard" conditions are
temperature of 0 °C, standard atmosphere and using
the true compressibility factor of the gas.
mass flow units for which "standard" conditions are a
user settable temperature, standard atmosphere and
using the true compressibility factor of the gas.
mass flow units for which "standard" conditions are
temperature of 0 °C, standard atmosphere and
assuming a compressibility factor of 1 for all gases.
volume flow units.
Page 39
3. OPERATION
Flow unit type: 1std
2user 3perfect 4vlm
<3perfect>
<4vlm>
<1plm>
<1ccm>
<2pccm>
<2lm>
<3pcfm>
<3lh>
<4pcfh>
<4m3h>
<5plh>
<6cfm>
<6pm3h>
<7cfh>
© 1998-2007 DH Instruments, a Fluke Company
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