Alicat M Series Mass Flow Meter - Manual (Page 16)

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when removed from the line and blocked, it was given a false zero. It is bett er
to zero the unit at atmospheric pressure and a confi rmed no fl ow conditi on
than to give it a false zero under line pressure.
Volumetric Flow Rate: This parameter is located in the lower left of the display.
It is moved to the primary display by pushing the butt on below CCM in this
example. Your display may show a diff erent unit of measure.
Mass Flow Rate: The mass fl ow rate is the volumetric fl ow rate corrected to a
standard temperature and pressure (typically 14.696 psia and 25 °C).
This parameter is located in the lower middle of the display. It can be moved to
the primary display by pushing the butt on below SCCM in this example. Your
display may show a diff erent unit of measure preceded by the lett er S.
To get an accurate volumetric or mass fl ow rate, the gas being measured
must be selected. See Gas Select, page 18.
MENU: Pressing MENU switches the screen to the Select Menu display.
Flashing Error Message: An error message (MOV = mass overrange,
VOV = volumetric overrange, POV = pressure overrange, TOV =
temperature overrange) fl ashes when a measured parameter exceeds
the range of the sensor. When any item fl ashes, neither the fl ashing
parameter nor the mass fl ow measurement is accurate. Reducing the value of
the fl ashing parameter to within specifi ed limits will return the unit to normal
operati on and accuracy.
If the unit does not return to normal operati on contact Alicat.