user manual

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 specied 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 signicantly 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 signicant 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 conrmed “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.