4Molbloc; 5Stab - Fluke MOLBOX RFM Operation And Maintenance Manual

molbox™ RFM™ OPERATION AND MAINTENANCE MANUAL
3.5.4 <4MOLBLOC>
PURPOSE
To initialize a molbloc when it is connected to molbox RFM and/or to identify the molbloc
currently connected to molbox RFM. To determine the gases with which the molbloc has
been calibrated.
PRINCIPLE
molbox uses molbloc specific calibration information contained in the molbloc's EEPROM to
determine whether it should operate in molbloc-L or molbloc-S mode and in its calculation of
flow through the molbloc. For the molbox RFM to correctly calculate the flow through the
molbloc, it must use the specific information for the molbloc that is currently connected. molbloc
EEPROM information is read and stored by molbox RFM in the molbox power up sequence
when it is turned on, or by selecting [SETUP], <4molbloc>.
The <4molbloc> function may be used any time there is a change in the molbloc connected
to a channel to assure that molbox RFM uses the correct molbloc information on subsequent
measurements. The <4molbloc> function can also be used to display identifying information
on the molbloc currently connected to the molbox RFM and to determine the gases with
which the molbloc has been calibrated.
OPERATION
To access the molbloc function, press [SETUP], and <4molbloc>.
Operation is similar to operation of the [molbloc] direct function key (see Section 3.4.8).
However, when in the molbloc identification screen, pressing [ENTER] causes a list of the
gases for which the molbloc has specific calibration coefficients to be displayed. The gases
are listed using their chemical abbreviationsError! Reference source not found.. After
viewing, press [ESCAPE] to return to the current run screen.
3.5.5 <5STAB>
PURPOSE
To change the stability limit that serves as the criterion for the flow Ready/Not Ready
indication (see Section 3.1.3).
PRINCIPLE
molbox RFM continuously monitors the rate of change of flow through the molbloc to which it is
connected and compares this rate to the stability limit to make a Ready/Not Ready determination
(see Section 3.1.3). The STABILITY function allows the stability limit to be adjusted by the user to
increase or decrease the stability required for a Ready (<*>) condition to occur.
The default stability limit is ± 0.5 sccm/second (or its equivalent in another flow unit).
The stability limit value is automatically converted when the flow unit of measure
is changed.
The stability limit is separate and different from the RATE DISPLAY function
(see Section 3.4.6.1) which allows the current rate of change of pressure to be displayed.
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