The Fischer Mess DS3105FN00A1 is a compact, high-reliability electro-mechanical differential pressure switch belonging to the proven DS31 Series engineered and manufactured by FISCHER Mess- und Regeltechnik GmbH (Germany) – a globally recognized benchmark in precision industrial flow and pressure instrumentation. The DS31 series is specifically developed for dependable medium-to-high differential pressure monitoring in liquid media (hydraulic fluids, lubricating oils, technical water) and compressed air within space-confined machinery skids and compact plant assemblies.

The instrument features a heavy-duty metallic measuring chamber paired with an elastic measuring diaphragm designed to withstand continuous pressure cycling and mechanical line pulsations. Diaphragm deflection resulting from differential pressure directly actuates 1 integrated microswitch (1 x SPDT potential-free contact). The unit covers a nominal measuring span of 0..4 bar (0..400 kPa) with an adjustable setpoint switching range of 0.4 to 4.0 bar via an internal adjustment screw. Distinctive advantages of model DS3105FN00A1 include compact G 1/8" female process connections and a pre-wired 1-meter electrical cable, facilitating fast on-site integration, mechanical vibration isolation, and dependable IP65 environmental sealing. The Fischer Mess DS3105FN00A1 serves as an optimal solution for high-pressure hydraulic filter monitoring, compressor skid protection, and lubrication loop supervision.

• Manufacturer: FISCHER Mess- und Regeltechnik GmbH
• Brand Origin: Germany
• Full Order Code: DS3105FN00A1
• Product Classification: Compact Industrial Differential Pressure Switch (DS31 Series)
• Dedicated Function: Differential pressure monitoring, high-pressure filter clogging surveillance, and hydraulic circuit protection
• Pressure Mode: Unidirectional differential pressure (0..Δp)
• Service Media: Hydraulic oils, lubricating oils, technical water, neutral industrial liquids, and compressed air
• Nominal Measuring Range: 0 to 4.0 bar (0 to 400 kPa / 0 to 0.4 MPa)
• Switching Adjustment Range: 0.4 to 4.0 bar (400 mbar to 4000 mbar)
• Switching Element: 1 microswitch (1 x SPDT potential-free changeover contact)
• Switching Operation: Adjustable setpoint via internal adjustment screw
• Contact Electrical Rating: 250V AC, 3A / 24V DC, 2A
• 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 pressure on either positive (+) or negative (-) port
• Process Pressure Connections: Female thread G 1/8" (G 1/8" female ports)
• Diaphragm Material: High-grade oil-resistant reinforced elastomer (NBR / Viton)
• Measuring Chamber Material: High-strength metallic alloy with protective finish
• Electrical Connection: Factory-fitted 1.0 m flexible connection cable with sealed strain relief
• Enclosure Protection Rating: IP65 conforming to EN 60529 (Total dust ingress prevention and resistance against water jets)
• 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, valve block manifold mounting, or equipment bracket mounting
• Typical Applications: High-pressure hydraulic oil filter clogging surveillance, hydraulic power unit (HPU) protection, rotary screw air compressor monitoring, CNC machine lubrication circulation loops, and booster pump skids