The Clark 2100 Series is a rugged piston-type flow switch constructed of polysulfone, designed for accurate flow detection in liquid or gas systems. A magnet embedded in a spring-loaded polysulfone piston is displaced by the fluid at a calibrated flow rate, actuating a hermetically sealed reed switch. This provides a reliable electrical signal for flow/no-flow indication, pump protection, or process control.

Key Features

• Wide Compatibility: Suitable for liquids and gases; polysulfone body offers excellent chemical resistance and is FDA-compliant for food contact.
• Adjustable Set Point: Factory calibrated, but field adjustment may be possible with consultation (contact Clark).
• Multiple Switch Options: Available with SPST (normally open) or SPDT (changeover) reed contacts, rated 0.5A @ 200V AC/DC.
• Versatile Mounting: Can be installed vertically (flow upward) or horizontally (with recalibration).
• High Repeatability: ±1% of set point ensures consistent switching performance.
• Compact Size: Small footprint ideal for OEM integration and space-constrained installations.

Technical Specifications

• Accuracy: ±10% of set point
• Repeatability: ±1%
• Pressure Drop: < 2 psi at maximum flow
• Maximum System Pressure: 150 psi (10.3 bar) at 70°F (21°C)
• Operating Temperature: -20°F to +212°F (-29°C to +100°C)
• Electrical Connection: 18 AWG, 24" PVC leads
• Approvals: UL, CSA, CE listed

Applications

The 2100 Series is widely used in machine tool coolant monitoring, HVAC systems, water treatment, chemical dosing, and industrial equipment requiring reliable low-flow detection. Its polysulfone construction makes it suitable for deionized water, many acids, and food-grade liquids.