The Fischer Mess DE85B52M41B90CEW0000 is an economical, high-performance digital differential pressure transmitter belonging to the ECO-LINE® DE85 Series manufactured by FISCHER Mess- und Regeltechnik GmbH (Germany) – a world-renowned pioneer in precision industrial pressure and flow instrumentation. This transmitter is specifically developed for measuring positive overpressure, negative under-pressure, and differential pressure in clean air and neutral, non-aggressive gaseous media.

At the core of the transmitter is a highly sensitive piezoresistive silicon sensor element designed to be completely silicone-free, delivering exceptional responsiveness, high overpressure resistance, and long-term zero-point stability. This specific model features a symmetrical bidirectional measuring span of -160 mbar to +160 mbar (-16 kPa to +16 kPa), providing a standard industrial 4-20 mA analog output via a 2-wire loop-powered configuration (24V DC) that simplifies wiring and saves control cabinet space. An outstanding feature is its integrated 4-digit LC display, providing immediate on-site readout of differential pressure measurements. Internal DIP switches allow effortless configuration of measuring spans, rising/falling characteristics, and units (mbar or Pa). Protected by a rugged enclosure achieving IP65 ingress rating (with sealing screw), it serves as the ideal instrumentation choice for HVAC air filter banks, fan speed regulation, and cleanroom surveillance.

• Manufacturer: FISCHER Mess- und Regeltechnik GmbH
• Brand Origin: Germany
• Full Order Code: DE85B52M41B90CEW0000
• Product Classification: Industrial Differential Pressure Transmitter (ECO-LINE® DE85 Series)
• Sensing Principle: Piezoresistive Silicon Sensor Bridge, completely silicone-free construction
• Pressure Modes: Bidirectional differential pressure, positive gauge pressure, negative gauge pressure
• Service Media: Air and neutral, non-corrosive, non-combustible gaseous media
• Nominal Measuring Range: -160 mbar to +160 mbar (-16 kPa to +16 kPa bidirectional)
• Range Configuration: On-board DIP switch configuration (rising/falling curve, symmetric/unidirectional, unit mbar or Pa)
• Analog Output Signal: 4 – 20 mA (2-wire loop-powered configuration)
• Operating Power Supply: DC 24V (Permissible supply range: 12 – 32 V DC)
• Measurement Accuracy: ±1.0% F.S. (Non-linearity, hysteresis, and repeatability combined)
• Temperature Compensation Range: -20°C to +70°C
• Long-Term Stability: ≤ ±0.2% F.S. / year
• Maximum Overpressure Proof: Proof pressure rating up to 750 mbar – 1 bar without zero-point shift
• Integrated Display: Built-in 4-digit LC display for direct local process value reading
• Process Pressure Connections: Pneumatic push-on hose / tube connectors
• Ingress Protection Rating: IP65 (Total dust protection and water-jet resistance with installed closing screw)
• Housing Construction: Robust industrial impact-resistant engineering polymer housing
• Wetted Materials: Silicon, Al2O3 aluminum oxide, FKM / NBR elastomer seals
• Operating Ambient Temperature: -20°C to +70°C
• Permissible Media Temperature: -20°C to +70°C
• Mounting Configuration: Direct surface/wall mounting or standard 35 mm DIN top-hat rail mounting
• Typical Applications: HVAC/AHU air filter clogging monitoring, VFD ventilation fan airflow regulation, industrial cleanrooms, exhaust duct draft monitoring, and industrial air handling systems