Cleanroom Utility Systems

Vacuum Pressure Controller

A coordinated closed-loop package that reads absolute pressure from a capacitance sensor and modulates a motorized stainless throttle valve between the process and pump, with local HMI, remote I/O and selectable communications.

Capacitance-sensor feedback with local setpoint HMI
Motorized downstream throttle valve between process and pump
0.1-1000 Torr selectable application span with remote I/O

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Product Introduction

The Vacuum Pressure Controller is a complete pressure-regulation package for an evacuated chamber, tool or clean utility process. The locked catalogue configuration combines one panel-style controller/HMI, one process-side capacitance vacuum sensor, one stainless butterfly throttle valve, one proportional electric actuator/control module, two opposed vacuum interfaces and organized power, sensor, valve and communications wiring on one low mounting base. The sensor returns an absolute-pressure signal to the controller; the controller compares it with the local or remote setpoint and continuously changes valve conductance toward the pump. This architecture supports stable downstream pressure control without changing the upstream gas feed. It is not a read-only vacuum gauge, a manual isolation valve or ID 1926's compressed-air quality monitoring cabinet, and it does not measure oil, particles, dew point or purity.

Key Features

Closed-loop control coordinates pressure sensing, setpoint comparison and proportional valve movement in one functional package

A local illuminated HMI provides direct pressure, setpoint, valve-status and alarm visibility at the equipment

The process-side capacitance sensor measures absolute pressure independently of most gas-species changes within its selected range

A motorized butterfly throttle valve varies pumping conductance instead of repeatedly switching the vacuum pump on and off

Separate process and pump flanges make flow direction and installation boundaries explicit for commissioning and service

Selectable analog, digital or network communication supports remote setpoints, status feedback, interlocks and recipe control

PI/PID tuning can be matched to chamber volume, gas load, valve conductance and pump response to reduce overshoot and hunting

A compact stainless base keeps the controller, valve and sensor relationship fixed while allowing clean routing of power and signal cables

Customer Product Concerns

A pressure-control loop can display a valid reading yet remain unstable if the sensor range, valve conductance, pump speed, control direction or signal wiring is mismatched.

A read-only gauge reports vacuum level but cannot correct pressure drift when gas load or pump conductance changesUse the complete feedback loop so the controller compares actual pressure with setpoint and continuously commands the proportional throttle valve.

A sensor with an excessively high full-scale range gives poor usable resolution around a low operating setpointSelect a capacitance-manometer full scale that brackets the normal recipe range and reserve adequate headroom for transients and venting logic.

An oversized valve can make small position changes too aggressive, causing hunting and repeated overshootSize the valve and any conductance-limiting hardware against gas load, chamber volume and effective pump speed before tuning the PI/PID loop.

Mounting the sensor behind the throttle valve can make the controller regulate pump-side pressure instead of the controlled process volumePlace the sensor on the process side with a short clean connection and assign the process and pump flanges correctly during installation.

Electrical noise or an incorrect 0-10 V scaling can create a plausible but wrong pressure signalUse shielded signal routing, common grounding, verified full-scale mapping and a zero check before enabling automatic valve movement.

Loss of power or communications can leave an undefined valve position and disturb a sensitive processSpecify the required fail position, hardwired interlocks and recovery sequence, then test them with the actual pump and process equipment.

Typical Applications

Semiconductor deposition, etch and vacuum process pressure stabilizationPharmaceutical vacuum drying and controlled low-pressure processingLaboratory chambers, gloveboxes and pilot-scale vacuum equipmentOptical coating, plasma treatment and thin-film process toolsBattery-material drying, degassing and controlled-vacuum enclosuresCleanroom equipment requiring recipe-based downstream absolute-pressure control

Technical Parameters

The catalogue basis is one MKS 640A / Type 250E-class closed-loop panel package using a local controller/HMI, a process-side capacitance-manometer input and a motorized stainless downstream butterfly valve. The selectable application span is 0.1-1000 Torr across matched sensor and valve configurations; a conservative controller contribution of +/-0.5% of configured full scale is used, while installed loop accuracy and response remain dependent on the ordered sensor, valve, gas load, chamber volume and pump. The standard control signal is 0-10 VDC, with 24 VDC actuator/controller power or an AC-fed panel supply and selectable analog, digital or industrial-network I/O.

Core Material	AISI 316L-class stainless wetted valve and sensor passages, anodized aluminum electronics housings, and process-selected elastomer sealing
Panel Thickness	2.0 mm nominal stainless mounting panel or base plate for the packaged controller assembly
Effective Width	80 mm nominal DN80 downstream throttle-valve bore in the illustrated configuration
Maximum Length	Up to 500 mm representative process-to-pump package envelope before external field cabling
Steel Facing Thickness	0 mm separate steel facing; the vacuum flow hardware uses solid machined stainless components
Core Density	Approximately 8000 kg/m³ representative density for AISI 316L stainless vacuum hardware
Thermal Conductivity	Approximately 15 W/(m·K) near 20°C for representative AISI 316L stainless components
Surface Finish	Natural neutral-silver stainless valve and sensor surfaces with machined sealing faces; dark blue-gray coated controller and actuator housings
Joint Type	Two opposing ISO-F DN80 vacuum flange interfaces for process and pump connections, with separate sealed sensor and electrical connectors
Customization	Available based on the intended application and operating environment.

Available Options

Capacitance-manometer full scales selected around the normal control setpointUpstream proportioning-valve or downstream throttle-valve control architectureDN40, DN63, DN80 or application-sized vacuum connections and valve conductanceFKM, FFKM or process-qualified alternative seal compoundsLocal panel HMI, remote rack controller or integrated valve-controller format0-10 V analog, digital I/O, RS232, RS485, Ethernet or selected industrial fieldbus communicationNormally open, normally closed or powered fail-position strategy where supportedPrewired stainless base, enclosure or equipment-frame integration with labelled field terminals

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