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molbox™ RFM™ OPERATION AND MAINTENANCE MANUAL
For example, to adjust a gas mix that is 95 % Nitrogen (N
Calculate the molecular weight of the mix.
N
2
O
2
Mix molecular weight = (28.016 x 0.95) + (31.999 x 0.05) = 28.215
Select N
2
Calculate:
Set flow multiplier in ADJ function to 1.0071.
OPERATION
To access the ADJ function press [SETUP] and select
<6adj>. The display is:
Edit the values as desired. Pressing [ENTER] returns you to the MAIN run screen with the
edited adder and multiplier values applied.
When the <6adj> function is active (an adder or multiplier other than 0 and 1 is entered), there is
an indicator on the top line of the main run screen. The indicator is an "A" in the character to the
right of the molbox flow units. The indicator uses the same position as the "K" indicator (see
section 3.2). If there is an ADJ and K active at the same time, the indicators will alternate,
appearing every other update of the flow value (about once each second).
The flow adder and multiplier of the ADJ function, if different from 0 and 1, alter the flow
readings made by the molbox. The ADJ function is always "ON". When using adders and
multipliers, great caution should be taken to ensure that they are entered and changed
correctly and that they are 0 and 1 if no adder or multiplier effect is desired. The ADJ
function is restricted in all User Security Levels except "none" to protect against
unintentional flow adjustment (See section 3.6.2).
3.6
[SPECIAL]
PURPOSE
The [SPECIAL] key accesses a menu of molbox RFM functions and settings that are less commonly or
not normally used in regular operation. These functions include:
<1reset>
Access and execute various reset options (see Section 3.6.1).
<2level>
Set user protection levels that restrict access to certain functions and to edit the user
password (see Section 3.6.2).
<3ul>
Set upper pressure limit alarm (see Section 3.6.3).
<4cal>
View and adjust the molbox RFM pressure transducers and reference resistors (see Section 3.6.4).
<5prefs>
Set display screen saver time, unit ID number and date and time (see Section 3.6.5).
<6remote> View and edit molbox RFM COM port (RS232) and IEEE-488 interface settings (see Section 3.6.6).
<7log>
View and/or clear the molbox RFM event log (see Section 3.6.7).
© 1998-2007 DH Instruments, a Fluke Company
molecular weight = 28.016
molecular weight = 31.999
, the highest concentration gas, as the molbox RFM gas.
molecular weight of the mix
molecular weight of the gas selecton on the molbox
Page 76
) and 5 % Oxygen (O
):
2
2
28.215
=
=
28.016
Adder: 0
sccm
Mult:
1.00000
1.0071
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