The Fischer Mess DE2802M290PL000P is a rugged electro-mechanical industrial differential pressure transmitter belonging to the proven DE28 Series engineered and manufactured by FISCHER Mess- und Regeltechnik GmbH (Germany) – a globally recognized benchmark in flow and pressure instrumentation. Specifically built to endure heavy-duty operating environments, the DE28 series is designed to handle direct differential pressure measurement of both liquid media (circulating water, glycol mixtures, light lubricating oils) and neutral gaseous media under high static line pressures.

The instrument incorporates a robust measuring chamber machined from solid brass combined with a resilient NBR elastomer measuring diaphragm, offering exceptional mechanical sealing integrity, fatigue resistance, and durability over numerous cyclic pressure changes. Deflection of the measuring diaphragm under differential pressure is transferred to internal electronics via a non-contact inductive displacement sensor system, which eliminates mechanical friction, component wear, and hysteresis errors. Featuring a measuring span of 0..1 bar (0..100 kPa / 0..0.1 MPa), high static operating pressure capability (PN16 / PN25), and one-sided overpressure protection, this transmitter delivers a reliable 4-20 mA analog output via a 3-wire configuration. Encased in an impact-resistant polymer housing rated to IP65, the Fischer Mess DE2802M290PL000P is the premier solution for chiller filter differential surveillance, circulation pump monitoring, and process line protection in thermal plants, water facilities, and industrial HVAC installations.

• Manufacturer: FISCHER Mess- und Regeltechnik GmbH
• Brand Origin: Germany
• Full Order Code: DE2802M290PL000P
• Product Classification: Industrial Differential Pressure Transmitter for Liquids and Gases (DE28 Series)
• Sensing Principle: Resilient measuring diaphragm with non-contact inductive displacement transducer
• Pressure Mode: Unidirectional differential pressure (0..Δp)
• Service Media: Neutral liquids and gases, cooling water, technical water, water-glycol mixtures, lubricating oils, and compressed air compatible with Brass and NBR
• Nominal Measuring Range: 0 to 1.0 bar (0 to 100 kPa / 0 to 1000 mbar)
• Analog Output Signal: 4 – 20 mA (3-wire current output configuration)
• Operating Power Supply: DC 24V (Permissible supply range: 18 – 32 V DC)
• Measurement Accuracy: ±1.5% F.S. (Non-linearity, hysteresis, and repeatability combined)
• Long-Term Stability: ≤ ±0.2% F.S. / year
• Nominal Static Line Pressure: Up to 16 bar / 25 bar (PN16 / PN25 rating)
• Overpressure Safety Limit: Unilateral overpressure protected up to nominal static pressure on either positive (+) or negative (-) pressure port without damaging the diaphragm
• Process Pressure Connections: Female thread G 1/4 (standard industrial center-to-center distance)
• Electrical Connection: Heavy-duty industrial plug connector with cable gland
• Diaphragm Material: High-resilience NBR elastomer
• Measuring Chamber Material: Solid brass alloy
• Outer Housing Construction: Impact-resistant glass-fiber reinforced polyamide polymer
• Ingress Protection Rating: IP65 (Total dust-tight protection and resistance against water jets)
• Permissible Medium Temperature: -10°C to +70°C
• Operating Ambient Temperature: -10°C to +60°C
• Mounting Configuration: Direct pipe-mounting or surface/wall-mounting bracket
• Typical Applications: Industrial chiller water/oil filter differential monitoring, flow rate measurement across orifice plates, booster pump differential control and dry-run protection, heat exchanger surveillance, and heavy building HVAC circulation loops