Alicat VC Series Volumetric Flow Controller - Manual (Page 18)

18
VC Series Volumetric Flow Controller Operation
The VC Series can have several screen “modes” depending on how the device is ordered. All VC
Series controllers have a default Main Mode, Select Menu Mode, Control Setup Mode, Gas Select
Mode (the Gas Select Mode may not be available on meters calibrated for a custom gas or blend),
Communication Select Mode, Manufacturer Data Mode and Miscellaneous Mode. In addition, your
device may have been ordered with the optional Totalizing Mode (page 43). The device defaults to Main
Mode as soon as power is applied to the controller. Note that volumetric controllers are intended for use
in near atmospheric conditions (Please see page 33).
Main Mode
The main mode screen shows the volumetric flow in the units specified at time of order. In the flow
mode, only two buttons are active as shown in Figure 13. The process gas that is selected is shown
directly under the flow units.
Set Pt.
0.000
Volume
CCM
Air
+0.000
Volume Main
Figure 13. Main Mode Display, VC Series Flow Controller
The “MODE” button in the lower right hand corner toggles the display between the Main Display and
the Menu Display.
Volume – The volume flow rate is defaulted on the primary display. If the set-point has been toggled to
the primary screen as described below, the volume flow rate can be toggled back to the primary display
by pushing the button (lower left corner) directly beneath the dynamic label “Volume”.
Set Pt – The set-point is shown in the upper right corner of the display. The set-point cannot be adjusted
from the main mode screen. For information on changing the set-point, see “Control Setup Mode”.
Flashing Error Message: Our volumetric flow meters and controllers display an error message
(VOV = volumetric overrange) when a measured parameter exceeds the range of the sensors in the
device. When any item flashes on the display, the flashing parameter is not accurate. Reducing the
value of the flashing parameter to within specified limits will return the unit to normal operation and
accuracy.