2021.05.26
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REV. 1
• DUAL-VALVE PRESSURE CONTROLLER OPERATING MANUAL
9
Dual-Valve Integrated Vacuum Controllers (IVCD)
IVCDs are similar to the PCD-Series absolute pressure controllers in functionality and in the navigation menus available
on the screen. IVC devices are used in applications where precise control of vacuum is required, and are available with
10 TorrA, 100 TorrA, 1000 TorrA, and combined 1000 & 10 Torr sensors.
Integration of the vacuum sensor, control valve, and PID algorithm in a single device eliminates the need for an external
vacuum sensor and throttle valve in your system. These devices have 7/16″-20 SAE ports, or optional VCR®-compatible,
compression, and VCO®-compatible fittings. Process port sizes may change depending on the valve on your device.
Using Alicat Pressure Instruments with Liquids
Many pressure devices may be used with chemically-compatible liquids, but a few warnings must be taken into account:
•
Water is about 50 times more viscous than air. This is important when sizing a pressure controller, as this significant
increase in viscosity requires a larger valve to reach expected flow rates. For example, a PCD-series pressure controller
sized to flow up to 25 SLPM of air will be limited to roughly 0.5 LPM of water (or similar fluid).
•
The factory PID tuning terms are established using air. It may be necessary to adjust the PID tuning parameters if you
will be using a controller with liquid. Find more information at
, or contact us (
) to help you
through this tuning process.
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Caution:
Please check with Alicat before using your pressure controller with liquids unless specifically ordered
for this purpose.
Gas Supply
Alicat IVCD
Optional Remote Sensor (on the back of IVC3 models)
Bidirectional Flow
Exhaust
Vacuum Pump
Process