About This Product

• Thermo-Flo® AT18 Liquid Flow Switch with Compact Junction Box
• General Purpose Flow Switch Package - Reliable No or Low-Flow Detection of Relatively Clean Non-Coating Liquids with Junction Box for Wiring Termination
• Service: Water, Acetic Acid and Compatible Chemical Solutions
• Specific Gravity 0.4..1.2; Viscosity 1..200 cP
• Long Sensor for Pipes 2 in. and Higher
• PVDF (Polyvinylidene Fluoride) Sensor Material - For Corrosive Liquids
• Two Temperature Probe Tips Perpendicular to Flow - Solid-State Thermal Dispersion Sensing
• 3/4 in. NPT (Standard) Process Mount Thread
• Set Point Range 0.04..3 fps (0.012..0.91 mps), Factory Calibrated to 0.2 fps (0.06 mps)
• Repeatability ±0.5% of Setpoint at Fixed Temperature
• Response Time 1..10 seconds
• Adjustable Setpoint via Potentiometer with LED Flow Status Indication
• Solid-State Sensor - Not Damaged by Over-Ranging Flow Velocities
• Supply Voltage 14..36 VDC
• Power Consumption 70 mA Maximum
• Contact Type: (1) SPST Relay - Selectable NO or NC via Power Supply Wiring Polarity
• Contact Rating 60 VA at 1 A Maximum
• Fail-Safe Relay Control of Pumps, Valves or Alarms
• Process Temperature 32..140°F (0..60°C)
• Ambient Temperature -40..140°F (-40..60°C)
• Maximum Pressure 150 psi (10 bar) at 25°C, Derated 1.667 psi/°C Above 25°C
• NEMA 4X (IP65) Polypropylene Enclosure with 300° Swivel Base for Conduit Alignment
• 6-Pole Terminal Strip with Single 1/2 in. NPT Conduit Entrance
• CE Compliant (EN 61326 EMC, EN 61010-1 Safety)
• Not for Use in Hazardous or Explosive Environments
• Best Applied with Relatively Constant Liquid Temperature
• 1 Year Limited Warranty

Documents

• Specification Sheet
• Product Manual
• Brochure

Attributes

TYPE

FAILSAFE RELAY

CONNECTION

00.75 IN. NPT

SWITCH TYPE

SPST