The Fischer Mess DS1102VDYYBKYY00D0544 is a heavy-duty electro-mechanical industrial differential pressure switch belonging to the proven DS11 Series engineered and manufactured by FISCHER Mess- und Regeltechnik GmbH (Germany) – a globally recognized benchmark in flow and pressure control instrumentation. Specifically designed for critical switching and monitoring operations, the DS11 series operates dependably with both liquid media (cooling water, glycol solutions, industrial lubricants) and neutral gases under elevated static line pressures.

The instrument incorporates a high-grade Viton® (FKM) elastomer measuring diaphragm combined with a heavy-duty metallic pressure chamber, delivering exceptional chemical resilience, hydrocarbon resistance, and thermal endurance. Diaphragm deflection caused by differential pressure is mechanically linked to reliable internal switching elements. A defining advantage of configuration DS1102VDYYBKYY00D0544 is its dual microswitch arrangement (2 independent SPDT microswitches), enabling two individually adjustable setpoints (e.g., Switch 1 for early warning alarm on reduced flow/filter clogging, and Switch 2 for safety shutdown to protect circulation pumps). Purpose-engineered for top flow monitoring across differential pressure primary elements (such as orifice plates and Venturi nozzles) within a 0..1 bar (0..100 kPa) span, it represents the premier solution for chiller flow confirmation, pump dry-running protection, and heavy lubricating circuits. Its IP65-rated enclosure ensures long-term operational integrity across harsh, dusty, and humid industrial environments.

• Manufacturer: FISCHER Mess- und Regeltechnik GmbH
• Brand Origin: Germany
• Full Order Code: DS1102VDYYBKYY00D0544
• Product Classification: Industrial Electro-Mechanical Differential Pressure Switch (DS11 Series)
• Dedicated Function: Differential pressure flow monitoring and dual-stage alarm/interlock control
• Pressure Mode: Unidirectional differential pressure (0..Δp)
• Service Media: Neutral liquids and gases, cooling water, technical water, water-glycol mixtures, hydraulic fluids, and industrial lubricating oils compatible with Viton
• Measuring & Switching Range: 0 to 1.0 bar (0 to 100 kPa / 0 to 1000 mbar)
• Switching Elements: 2 independent microswitches (2 x SPDT potential-free changeover contacts)
• Switching Operation: Individually adjustable setpoints across the span for dual-stage control (Warning / Trip)
• Contact Electrical Rating: 250V AC, 5A / 24V DC, 3A
• Switching Reproducibility / Accuracy: ±1.5% to ±2.0% of full scale (F.S.)
• Nominal Static Operating Pressure: Up to 16 bar / 25 bar (PN16/PN25 rating)
• Overpressure Safety Limit: Unilateral overpressure protected up to nominal static chamber pressure without damaging the diaphragm
• Process Pressure Connections: Female thread G 1/4 (standard industrial port spacing)
• Diaphragm Material: Viton® (FKM) fluoroelastomer for superior chemical, oil, and heat resistance
• Measuring Chamber Material: High-strength die-cast aluminum or brass with corrosion-resistant coating
• Enclosure Protection Rating: IP65 conforming to EN 60529 (Total dust ingress prevention and resistance against water jets)
• Electrical Connection: Internal terminal strip with watertight industrial cable gland (PG / M20)
• Permissible Medium Temperature: -10°C to +70°C (optional up to +85°C)
• Operating Ambient Temperature: -10°C to +60°C
• Mounting Configuration: Direct pipe-mounting or surface/wall-mounting bracket
• Industrial Applications: Flow monitoring across orifice plates/Venturi nozzles, cooling water pump dry-run protection, dual-stage chiller filter clogging alarm, heavy compressor lubricating loop monitoring, and building HVAC circulation systems