Specifications
molbox™ RFM™ OPERATION AND MAINTENANCE MANUAL
© 1998-2007 DH Instruments, a Fluke Company Page 32
3.4.2.1 molbloc-L OPERATION
The molbox RFM gases available for use with molbloc-L at the time of this
manual printing are listed in Table 9.
Table 9. Available molbloc-L Gases
<1inert> <2flammable> <3toxic> <4other>
<1N2> Nitrogen
<2He> Helium
<3Ar> Argon
<1H2> Hydrogen
<2O2> Oxygen
<3CH4> Methane
<4C2H4> Ethylene
<5C3H8> Propane
<6C2H6> Ethane
<7Butn> Butane
<1CO> Carbon Monoxide <1Air> Air
<2C2F6> Hexafluoroethane
<3N2O> Nitrous Oxide
<4CF4> Carbon Tetrafluoride
<5SF6> Sulfur Hexafluoride
<6CHF3> Fluoroform
<7C02> Carbon Dioxide
<8Xe> Xenon
<9C4F8> Octafluorocyclobutane
<Butn> is used to identify Butane in molbox RFM because the chemical symbol for
Butane (C
4
H
10
) has more than the 4 characters used by molbox RFM to abbreviate
gas identifications.
Mixtures of known gases in known concentrations can be measured by calculation
and use of the ADJ function (see Section 3.5.6).
OPERATION (molbloc-L OPERATION)
To specify the gas flowing through molbloc-L,
press [GAS]. The display is:
1inert 2flammable
3toxic 4other
The gases available are grouped in categories to
facilitate finding a specific gas and as a reminder to the
user when selecting a gas that may require special
precautions in use. There is a list of gases under each
category. For example, the <1inert> selection displays:
1N2 2He 3Ar
Select the desired gas. Pressing [ENTER] returns to the last run screen with the newly
selected gas active. The selected gas is always displayed in the upper right hand corner of
the MAIN run screen.
The gas selected on molbox RFM should always be the gas that is flowing through
the molbloc. molbloc/molbox does not use K factors or gas conversion factors
between gases. When calibrating or testing a device with a surrogate gas, molbox RFM
should be set to the surrogate gas. The K factor or gas conversion factor, if used,
defines the relationship between the surrogate gas and the process gas for the device
being tested, not for molbloc/molbox (see Section 3.4.1, PRINCIPLE). The K factor is
supplied by the manufacturer of the device being tested.