Industry / Cleanroom Monitoring
Cleanroom pressure cascade — without sensor drift, without false alarms
ISO 14644 mandates continuous monitoring of pressure differential between cleanroom zones — typically 5 to 20 Pa. With a ring balance, you measure these differentials purely mechanically, consistently accurate. The restoring force is based on weight and geometry — no ageing components, no drift. This supports a risk-based extension of calibration intervals once the calibration history demonstrates stability.
A
Regulatory requirements
DIN EN ISO 14644-4 requires continuous differential pressure monitoring between cleanroom classes and against the corridor. The EU GMP guidelines (Annex 1, 2022) go further: aseptic production areas must demonstrate a documentable pressure cascade, typically from the highest class (A/B) to lower classes (C/D) with at least 10–15 Pa difference.
- Permanent display visible in the corridor or at the airlock
- Alarm contact triggered when the minimum differential is undercut
- Loggable signal (4–20 mA or 0–10 V) for GMP audits and validation
- Scale must be readable from at least two metres away
B
Why a ring balance fits here
The typical weakness of electronic differential pressure sensors is drift. Diaphragm, piezo, and capacitive sensors age: calibration walks off over months, leading in GMP environments to false alarms, unplanned re-calibrations, and validation overhead. The pressure-measuring part of the ring balance contains no diaphragm, no spring, and no components that age, fatigue, or become brittle. Calibration is determined solely by a fixed weight, a lever, and the geometry of the dividing wall — all quantities that do not change.
C
Technical parameters
D
Recommended products
pure indicator with optional set-point contacts
when a 4–20 mA signal to building management is required
loop-powered 2-wire transmitter — when no separate supply voltage is available on site
when a 4–20 mA signal is required but no analogue scale is needed
Trusted by
In pharma and cleanroom environments, Rixen instruments are trusted by: Bayer AG, Novartis AG, Vetter-Pharma, EBEWE Pharma, WEISS-Pharmatechnik, RHÖN Klinikum Bad Neustadt.
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