The Fischer Mess DE1601VA20B90H00 is a heavy-duty industrial differential pressure transmitter belonging to the renowned DE16 Series engineered and manufactured by FISCHER Mess- und Regeltechnik GmbH (Germany) – a world leader in precision flow and pressure instrumentation. Unlike delicate differential sensors designed exclusively for clean room air, the DE16 series is purpose-built to operate reliably with both liquid media (cooling water, technical water, light hydraulic and lubricating oils) and neutral gaseous media under high static line pressures.

The instrument incorporates a robust die-cast aluminum measuring chamber combined with a premium Viton® (FKM) elastomer sensing diaphragm, delivering exceptional chemical resilience, oil resistance, and elevated thermal endurance. Deflection of the measuring diaphragm under differential pressure is transferred contact-free via an inductive sensor system, completely eliminating mechanical friction, wear, and hysteresis drift. Featuring a measuring span of 0..0.6 bar (0..60 kPa) and a high nominal static line pressure rating of PN25 (25 bar), this transmitter provides one-side overpressure protection up to rated line pressure on both ports. It delivers a linear 4-20 mA analog output via a 2-wire loop-powered configuration and connects electrically through a heavy-duty DIN EN 175301-803-A (Form A) connector. With IP65 ingress protection, it represents an outstanding instrumentation choice for industrial chiller plants, cooling circuits, pumping stations, and industrial filter banks.

• Manufacturer: FISCHER Mess- und Regeltechnik GmbH
• Brand Origin: Germany
• Full Order Code: DE1601VA20B90H00
• Product Classification: Industrial Differential Pressure Transmitter for Liquids and Gases (DE16 Series)
• Sensing Principle: Elastic 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, hydraulic fluids, and lubricating oils compatible with Aluminum and Viton
• Measuring Range: 0 to 0.6 bar (0 to 600 mbar / 0 to 60 kPa)
• 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: ±1.5% F.S. (Combined non-linearity, hysteresis, and repeatability)
• Nominal Static Line Pressure: Up to 25 bar (PN25 rating)
• Overpressure Safety Limit: Unilateral overpressure protected up to nominal static pressure on either positive (+) or negative (-) pressure side
• Process Pressure Connections: Female thread G 1/4 (standard industrial center distance)
• Electrical Connection: Standard DIN EN 175301-803-A industrial valve plug (Form A / DIN 43650-A) with PG9 cable gland
• Diaphragm Material: Viton® (FKM) elastomer for oil, chemical, and temperature resistance
• Measuring Chamber Material: Rugged die-cast aluminum alloy
• Outer Housing Construction: Impact-resistant glass-fiber reinforced polyamide polymer
• Ingress Protection Rating: IP65 (Total dust-tight sealing and resistance against industrial water jets)
• Permissible Medium Temperature: -10°C to +70°C
• Operating Ambient Temperature: -10°C to +60°C
• Mounting Configuration: Direct pipe-mounting or wall-mounting bracket
• Typical Applications: Industrial chiller water/oil filter differential monitoring, flow rate measurement across orifice plates, circulation pump differential control and dry-run protection, heat exchanger surveillance, and heavy machinery liquid cooling loops