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V Series Volumetric Flow Meter Operation
The V Series can have several display “modes” depending on how the device is ordered. All V Series
meters have a default Main Mode,a 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. Note that
volumetric meters are intended for use in near atmospheric conditions (Please see page 26).
Main Mode
The main mode display shows the volumetric ow in the units specied at time of order. In the ow
mode, only two buttons, Tare and Mode, are active as shown in Figure 11. The process gas that is
selected is shown directly under the ow units.
Tare
Volume
CCM
Air
+0.000
Volume Main
Figure 11. Main Mode Display, V Series Flow Meter
The “MODE” button in the lower right hand corner toggles the display between the 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 and
whenever a known zero ow condition exists. 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.
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” condition 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.