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10
M Series Mass Flow Meter Operation
The M Series Mass Flow Meter provides a multitude of useful ow data in one simple, rugged device.
The M Series can have several display “modes” depending on how the device is ordered. All M Series
meters have a default Main Mode, Select Menu Mode, a Gas Select Mode (the Gas Select Mode may
not be available on meters calibrated for a custom gas or blend), a Communication Select Mode and
a Manufacturer Data Mode. (In addition, your device may have been ordered with a Totaliizing Mode,
page 36.) The device defaults to Main Mode as soon as power is applied to the meter.
Main Mode
The main mode display defaults on power up with the mass ow on the primary display. The following
parameters are displayed in the main mode as shown in Figure 6.
PSIA
o
C Tare
+13.49 +22.73
MASS
SCCM
Air
+0.000 +0.000
Volume Mass Main
Figure 6. Main Mode Display, M Series Flow Meter
The “MODE” button in the lower right hand corner toggles the display between Main Display and the
Select Menu Display.
Tare – Pushing the dynamically labeled “Tare” button in the upper right hand corner tares the ow meter
and provides it with a reference point for zero ow. This is a simple but important step in obtaining
accurate measurements. It is good practice to “zero” the ow meter each time it is powered up. If the
ow reading varies signicantly from zero after an initial tare, give the unit a minute or so to warm up
and re-zero it.
If possible, zero the unit near the expected operating pressure by positively blocking the ow downstream
of the ow meter prior to pushing the “Tare” button. Zeroing the unit while there is any ow will directly
affect the accuracy by providing a false zero point. If in doubt about whether a zero ow condition exists,
remove the unit from the line and positively block both ports before pressing the “Tare” button. If the unit
reads a signicant negative value when removed from the line and blocked, it is a good indication that
it was given a false zero. It is better to zero the unit at atmospheric pressure and a conrmed no ow
conditions than to give it a false zero under line pressure.
Note: A remote tare can be achieved by momentarily grounding pin 4 to tare as shown in Figure 5
on page 9.
- Precision Gas Flow Meter 1
- Operating Manual 1
- Installation 5
- AC/DC Adapter Jack 6
- DB-9 Serial Port 8
- 8 Pin Mini-DIN Port 8
- 10
- PgUP PgDWN Main 12
- RS-232 Output and Input 16
- Volume Flow vs. Mass Flow 22
- (NIST REFPROP 7 database) 25
- TROUBLESHOOTING 28
- Warranty 29
- Maintenance and Recalibration 29
- Mechanical Specications 30
- Dimensional Drawings: page 33 30
- Dimensional Drawings: page 35 33
- Option: Totalizing Mode 37
- Option: 9 Volt Battery Pack 38
- Accessories 40
- Calibration Certicate 41
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