Alicat FlowVision 2.0 - Fluid Density for CODA Devices; Setting Fluid Density Parameters; Controller Functionality; Control Options for Controllers

Devices September, 2022 • Rev. 2 • FlowVision 2.0™ user manual 12
Fluid Density (CODA Devices)
See figure 16
CODA devices use density to calculate a volumetric flow
rate. A standardized density can be set if desired.
• Select Fluid Type, Fluid, and Temp to
set the new standardized density.
• Click Apply. This density displays in the device tab
and is used for the volumetric flow rate calculation.
Controller
See Figure 17
The Controller section adjusts the setpoint source, auto-
tare function, and valve tuning of an Alicat controller.
This section is not present on meters and gauges.
Control
The control portion of the Controller section manages the
setpoint of the controller. The Setpoint Source manages if
the setpoint is controlled by an analogue input or through
serial communication and the front panel display (if a display
is present).
• Adjust the source by using the dropdown
menu under Setpoint Source to make
a selection, then click Apply.
• Adjust the setpoint type by clicking the Setpoint
Type dropdown menu and selecting a type of setpoint
(mass flow, volumetric, pressure etc), then click Apply.
Valve Oset
Gas pressure in the system exerts a mechanical force on
the control valve that, depending upon the gas pressure,
may slow the valve’s response when opening from a zero
setpoint. To compensate for this, adjusting the valve
offset (or “preload”) may speed up integration time.
• Adjust valve oset by setting the value of the
number under the Valve Offset label, then
click Apply. Valve oset is a percentage value
between 0 and 100, with 0 being little to no
oset and 100 being the maximum oset.
PID
If you require specialized valve tuning, adjusting the 
values of a device is necessary. Adjustment of  values
changes valve stability and speed.
▲
Caution: It is strongly recommended
that adjustments to  settings not be
made unless you have experience with
proportional valve tuning. Improper
tuning may damage the device or valve.
• Adjust  tuning by clicking the dropdown
menu under PID Type and selecting either PD/
PDF or PDDI. Set the new values for each
parameter in the fields below, then click Apply.
Auto Tare
Enabling auto tare sets the device to tare after a zero
setpoint is established for a given amount of time. The delay
field below the toggle indicates how long the device waits
before taring. This wait is measured in seconds.
Figure 16. Fluid density settings.
Figure 17. Controller settings.