The Fischer Mess DE90R50040P000000000 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 -160 mbar to +160 mbar, delivering a standard 4-20 mA analog output (3-wire configuration) and pneumatic connections for 6 mm outer-diameter tubing (6/4 mm hose). 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 industrial dust collector differential monitoring, heavy-duty ventilation systems, AHU filter banks, and pneumatic automation setups.

• Manufacturer: FISCHER Mess- und Regeltechnik GmbH
• Brand Origin: Germany
• Full Order Code: DE90R50040P000000000
• 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: -160 mbar to +160 mbar (-16 kPa to +16 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 proof pressure rating up to 750 mbar – 1 bar without zero-point shift
• Process Pressure Connections: Pneumatic push-on hose / tube connectors for 6 mm outer-diameter tubing (Ø 6 mm / 6/4 mm hose)
• Integrated Display: Fully graphic multi-line LC display with smart colour-change status backlighting (Green: Normal / Red: Alarm)
• 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: Industrial baghouse/cyclone filter loading surveillance, HVAC/AHU high-pressure air filter banks, industrial ventilation fan pressure monitoring, dust extraction ducts, and plant cleanroom systems