Safety in the clean room
Solutions for ensuring safety through: Pressure transmitters in clean room monitoring systems.
Stable air pressure is important in clean and hygienic rooms to avoid contamination. It reduces disturbances in the air and generates the desired air flows. The air is purified via various filter systems and either a permanent positive pressure or negative pressure is generated. This technology is used in a variety of manufacturing processes, e.g. in the semiconductor industry, food technology and pharmaceuticals. The protection of people and products must be guaranteed for compliant cleanroom systems. Our pressure transmitters support you in this by enabling reliable measurement thanks to their innovative diaphragm design and integrated solenoid valves. This ensures the stability of the air pressure and compliance with the required hygiene standards.
Conceptual design of a clean room
Barriers are required to monitor and control the movement of particles in cleanrooms. In the area of passages for people and material, these are realized via defined pressure zones.
The pressure zones are realized with the smallest pressure differences <25 Pa (corresponds to 0.00025 bar). This difference is already sufficient for effective protection. This ensures that air movement and thus the exchange of particles is avoided. The path of the particles can therefore be controlled. High-precision differential pressure measurement technology also increases energy efficiency.
In the classic cascade airlock, the differential pressure drops starting at the product. This creates a particle movement away from the product. The product is effectively protected.
The bubble airlock uses a ‘bubble’ of clean air to separate the cleanroom from less clean air. This airlock is realised by an increased differential pressure to the cleanroom and the corridor.
The sink airlock has a lower pressure inside the airlock and a higher pressure on the other two sides of the airlock. Here, air is drawn in from both neighbouring areas, creating a low-pressure barrier and preventing the possibility of impurities entering the inner area.
A double chamber airlock consists of two separate chambers that serve as an intermediate space between a clean room and a less clean area. Each chamber is individually controlled in terms of cleanliness and pressure.
Room-in-room concepts offer efficient and flexible solutions in cleanrooms by creating isolated areas within a larger cleanroom. These concepts make it possible to adapt to different production requirements at minimum cost. The air consumption of the individual zones is independent of each other. The effects on the pressure zones due to varying air consumption must be taken into account.
Continuous measurement of the pressure conditions using a monitoring system offers a tried and tested solution here.
Controlled positive and negative pressure in the clean room
Automatic zeroing in differential pressure transmitters ensures reliable pressure measurements by regularly adjusting the zero point of the transmitter. This is done by an integrated zeroing valve. This automatically performs zeroing to prevent drift or shifts in the zero point. This ensures stable measurement results even over longer periods of time.
This valve also protects the transmitter against overpressure. When critical pressure limits are reached, it opens automatically to equalise the pressure and thus prevent damage to the transmitter.
This fully automated function ensures permanent and fault-free availability of the system.
Important terms in the field of cleanroom safety
Ensuring standards
ISO 14644
GMP (Good Manufacturing Practice)
ISO 50001 Energy management
Areas
Monitored areas
Areas subject to authorisation
Advances in technology
Improved filter technologies
Modular cleanroom systems
Flow optimisation and CFD simulations
Energy efficiency
Solutions for clean and hygiene rooms
Standard transmitter
for basic applications
With our economical PS 17 and PS 27 series differential pressure sensors, the condition and degree of contamination of filter systems, for example, can be monitored in real time by monitoring the pressure drop. This allows the filter to be changed at the right time, saving resources, avoiding downtime and ensuring production quality.
Advantages
- Compact transducer with linear characteristic curves and optional display
- Measuring accuracy between 1 % and 3 % FS depending on version
- Individual, also asymmetrical measuring ranges up to ± 50 Pa
High-end transmitter
for demanding applications
The precise differential pressure transmitters in the P 26 and P 34 series meet the highest demands for measuring accuracy and stability, even in small pressure ranges. This means that pressure cascades in clean rooms or clean production zones, for example, can be continuously monitored - for consistently high production quality and reliable personal protection. Thanks to the inductive measuring principle, excellent long-term stability and optimum temperature behavior are guaranteed. The slightest pressure deviations are detected immediately. In combination with differential pressure transducers, the pressure transmitters can also be used for volume flow measurement.
Advantages
- High-precision transducers for the smallest measuring ranges of ± 10 Pa
- Measuring accuracy of 0.2 % or 0.5 % FS depending on version
- High overload safety due to integrated valve
- Integrated cyclical zero point correction for maximum long-term stability
- Extensive modular system of variants
Solutions for mobile pressure measurement
The compact KAL 100 / 200 calibration device and the EMA 200 hand-held device can be used as on-site test equipment to check or calibrate differential pressure transmitters in use quickly and easily. The portable, battery-powered EMA 200 digital pressure gauges measure positive and negative differential pressure and are ideal for customer service and maintenance work, e.g. on heating, ventilation and air conditioning systems or for filter monitoring, thanks to their ease of use. The KAL 100 / 200 calibration device is a combination of pressure transmitter and pressure measuring device. It can be used to test and calibrate pressure sensors and other pressure measuring devices for low pressures in a simple mobile manner - connection to an external compressed air generator is not required.
Advantages
- High accuracy and long-term stability thanks to automatic zero point adjustment, measuring accuracy up to 0.1 % FS depending on version
- Simple menu navigation for switching units, setting calibration points and defining the measuring span (in several languages)
- Generation of positive and negative differential pressures
- Convenient operation and creation of calibration curves via USB interface and PC
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