Cleanroom Pressure Differential Automation

Maintaining stable pressure differentials between rooms of different cleanliness classes is a fundamental principle of ensuring a controlled air environment. Positive pressure in cleaner zones relative to less clean areas creates a reliable barrier against the ingress of pollutants, particles, and microorganisms.

The pressure differential automation system provides continuous monitoring and regulation of airflows, preventing the back-migration of contaminants during door openings, personnel movement, or changes in the operating modes of technological equipment. These systems are critically important for pharmaceutical manufacturing, healthcare facilities, biotechnological complexes, and microelectronics enterprises where maintaining cleanliness classes from ISO 5 to ISO 8 according to ISO 14644-1 is required.

Operating Principle and System Components

The automated pressure differential control system includes the following main elements:

• Pressure Sensors: High-precision absolute and differential pressure transducers for measuring drops between adjacent rooms.

• Controllers: Programmable Logic Controllers (PLCs) with PID control algorithms to maintain specified parameters.

• Actuators: Variable Frequency Drives (VFDs) for fans, electric actuators for control dampers, and valves.

• Visualization System: Operator panels and SCADA interfaces for displaying current parameters and generating alarm signals.

• Integration Modules: Components for inclusion into general Building Management Systems (BMS) or dispatching systems.

The system's algorithm provides automatic compensation for pressure disturbances that occur when technological openings are opened or production modes change, maintaining stable pressure gradients in the range of 5-15 Pa between zones of different cleanliness.

Regulatory Framework

The design and implementation of pressure differential automation systems are carried out in accordance with the requirements of GOST R ISO 14644-4-2002 ("Cleanrooms and associated controlled environments. Part 4: Design, construction, and start-up"), which establishes the general principles for creating systems to maintain controlled air environment parameters.

Compliance with these standards ensures the creation of an effective contamination prevention system and the maintenance of the required sanitary and hygienic conditions in cleanrooms.