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For molbox1+ to communicate with an RPMx connected to its
COM2 port, the molbox1+ and the RPMx RS-232 interfaces must
be set up properly (see Section 3.6.6.1). If, the molbox1+ is unable
to locate an RPM ON COM2 when running AutoZ by COM2, it times
out after 6 seconds and displays an error message.
If molbox1+ is able to communicate with an RPMx on its COM2 port, the display is:
1.
Real time reading (without head correction) of
upstream (1, Hi) RPT in unit of measure on line 2.
2.
Real time reading (without head correction) of
downstream (2, Lo) RPT in unit of measure on line 2.
3.
Real time reading of the RPMx connected to molbox1+
COM2 to provide the value of AutoZ P
Observe the pressure outputs verify that they are stable. A 10 to 15 minute wait,
after venting, is recommended before running AutoZ. When ready, press [ENT]
to cause AutoZ to run. molbox1+ logs both RPT readings and calculates a new
AutoZ offset value. The display is:
1.
Current/previous value of P
(1, Hi) RPT.
2.
Current/previous value of P
(2, Lo) RPT.
3.
New value of P
for the upstream (1, Hi) RPT for
offset
the AutoZ that was just run.
4.
New value of P
for the downstream (2, Lo) RPT
offset
for the AutoZ that was just run.
Press [ENT] to activate the new values of P
The value of P
is always displayed and entered in Pascal (Pa).
offset
3.4.4.5
<5BPR> (molbloc-S Operation Only)
PURPOSE
To quickly measure the molbloc-S upstream and downstream pressure and
calculate and display the BPR (back pressure ratio) when molbox1+ is in a
molbloc-S BPR mode which would not otherwise measure the BPR.
The <5BPR> menu selection is only present during molbloc-S
operation.
PRINCIPAL
molbox1+ uses the back pressure ratio, or BPR (the ratio of the molbloc-S
downstream absolute pressure to the upstream absolute pressure) to determine
whether the flow through the throat of the molbloc-S Venturi nozzle is critical and
flow measurements within predictable uncertainty limits can be made with
molbloc-S (see Section 3.1.5). When operating molbox1+ with molbloc-S, the
user may select different BPR monitoring modes (see Section 3.6.9). Depending
on which BPR mode is selected, the BPR value is not always measured. The
BPR function allows the user to measure and display BPR directly at any time
regardless of which BPR mode is selected.
Page 69
Note
96.7715U
Pstd,0:96.7752
.
offset
for the upstream
offset
for the downstream
offset
Old: 0.0 Pa 0.0
New: 3.7 Pa 2.6
or [ESC] to start over.
offset
Note
Note
© 1995 - 2010 Fluke Corporation, DH Instruments Division
3. OPERATION
96.7778D
kPa
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