2021.08.19 REV. PRESSURE CONTROLLER OPERATING MANUAL 9
Remote-Sensing Controller
PC3-Series models sense and control the pressure at some point in the system outside of
the pressure controller itself. All PC-Series controllers can be ordered with an additional
NPT port on the front, which is connected directly to the pressure sensor in the device. The
pressure sensor is isolated from the flow path in this configuration.
Integrated Vacuum Controllers (IVC)
IVCs are similar to the PC-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 /-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 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 more than 55 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 PC-Series pressure controller sized to flow up to 20 of
air will be limited to roughly 0.5 LPM of water (or similar fluid).
•
The factory PID tuning is done using air. It may be necessary to adjust the PID tuning
parameters when using a controller with liquid. Find more information, contact support
(page 16) to help you through this tuning process.
▲
Caution: Please check with customer support before using your pressure controller with
liquids unless specifically ordered for this purpose.
Gas
Supply
PC3 Controller
Flow
Pressure Sensor Line (no flow)
Process
Gas Supply
IVC
Optional Remote Sensor (on IVC3 models)
Process
Exhaust
Vacuum Pump
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