The Fischer Mess DE90B20041P000000000 is a premier high-precision digital differential pressure transmitter belonging to the renowned PRO-LINE® DE90 Series engineered and manufactured by FISCHER Mess- und Regeltechnik GmbH (Germany) – a global leader in high-performance pressure and flow control instrumentation. This transmitter is specifically developed for measuring overpressure, under-pressure, and differential pressure in clean air and neutral, non-aggressive gaseous media.

At the core of the transmitter lies a highly sensitive piezoresistive silicon measuring cell, delivering superior long-term stability and robust overpressure protection. This specific configuration features a bidirectional symmetrical measuring span of -25 mbar to +25 mbar, delivering a standard 4-20 mA analog output (3-wire configuration) and robust pneumatic connections for 8 mm outer-diameter tubing. A defining highlight of the FISCHER PRO-LINE® DE90 series is its fully graphic multi-line LC display equipped with dynamic colour-change backlighting (green/yellow/red), enabling operators to verify process health and alarm conditions instantly from a distance. The instrument offers convenient on-site parameter configuration via integrated push buttons or via its USB-OTG interface using the PC software FISCHER inTouch. Enclosed in a rugged IP65-rated housing, it serves as the ultimate instrumentation choice for GMP cleanroom suites, negative-pressure isolation wards, AHU filter monitoring, and semiconductor microenvironments.

• Manufacturer: FISCHER Mess- und Regeltechnik GmbH
• Brand Origin: Germany
• Full Order Code: DE90B20041P000000000
• Product Classification: Digital Differential Pressure Transmitter (PRO-LINE® DE90 Series)
• Sensing Principle: High-precision Piezoresistive Silicon Sensor Bridge
• Pressure Modes: Bidirectional differential pressure, positive gauge pressure, negative gauge pressure
• Service Media: Air and neutral, non-corrosive, non-combustible gases
• Nominal Measuring Range: -25 mbar to +25 mbar (-2.5 kPa to +2.5 kPa bidirectional)
• Analog Output Signal: 4 – 20 mA (3-wire configuration, reversible and scalable)
• Operating Power Supply: DC 24V (Permissible supply range: 18 – 30 V DC)
• Measurement Accuracy: ±0.5% F.S. (Non-linearity, hysteresis, and repeatability combined)
• Long-Term Stability: ≤ ±0.2% F.S. / year
• Maximum Overpressure Limit: High overpressure proof capability up to 500 mbar (50 kPa) without zero-point shift
• Process Pressure Connections: Hose / tube push-in fittings for 8 mm outer-diameter tubing (Ø 8 mm pneumatic tube connection)
• Integrated Display: Fully graphic multi-line LC display with smart colour-change status backlighting (Green / Yellow / Red)
• Digital Interface: Integrated USB-OTG port (Micro-USB) for on-site parametrization via FISCHER inTouch PC software
• Ingress Protection Rating: IP65 (Total dust protection and resistance against water jets)
• Housing Construction: Impact-resistant Polyamide PA6.6 engineering polymer with UV-stabilized Polycarbonate window
• Wetted Materials: Silicon, Al2O3 aluminum oxide, FKM / NBR elastomer seals
• Operating Ambient Temperature: -10°C to +60°C
• Storage Temperature Range: -20°C to +70°C
• Mounting Configuration: Direct wall mounting or 35 mm DIN top-hat rail mounting
• Typical Applications: GMP pharmaceutical cleanroom pressure cascade monitoring, hospital negative-pressure isolation wards, AHU/HVAC air filter loading surveillance, ventilation airflow monitoring, and medical operating room control