Thomas Products 18353 Flow Switch for Liquid Flow Monitoring

Description:

The Thomas Products 18353 Flow Switch Model 1900 is used for monitoring low liquid flow and actuating electrical control circuits when a preset flow rate is reached. Commonly installed in laboratory equipment, cooling systems, medical devices, water treatment equipment, and industrial process controls, this in-line piston flow switch features a 1/4-inch FNPT brass body with a factory-set 0.75 GPM increasing-flow set point and an SPDT reed switch. Maintenance teams and system integrators use this part for repair, retrofit, expansion, and replacement of precision liquid flow monitoring systems. 

Applications:

The Thomas Products 18353 is designed for detecting low flow rates in water, oil, and other compatible liquids. It is widely used in OEM equipment, laboratory instrumentation, coolant circulation systems, medical equipment, industrial automation, and process control applications where accurate low-flow monitoring is essential. The compact piston design provides dependable switching performance while allowing flexible mounting in confined spaces.

Technical Specifications:

• Manufacturer Part Number (MPN): 18353
• Brand: Thomas Products Ltd.
• Model: 1900 Series
• Product Type: In-Line Piston Liquid Flow Switch
• Housing Material: Brass
• Process Connection: 1/4 in FNPT (Both Ports)
• Flow Set Point: 0.75 GPM Increasing Flow
• Switch Logic: SPDT Reed Switch
• Electrical Rating: 20 VA Pilot Duty
• Operating Media: Water, Oil, and Compatible Liquids
• Operating Pressure: Up to 1000 PSIG
• Proof Pressure: 2000 PSIG
• Burst Pressure: 4000 PSIG
• Operating Temperature: -20°F to +250°F (High-temperature options available up to +400°F)
• Wire Leads: 18 AWG, 24 in Polymeric Leads
• Spring Material: 316 Stainless Steel
• Mounting: In-line Pipe Installation with Optional Dual Mounting Holes
• Set Point Accuracy: ±10% Maximum
• Repeatability: 1% Maximum Deviation
• Calibration: Factory calibrated in water at 70°F on increasing flow
• Certifications: UL Recognized (File No. E86797)

Common Replacements:

• Thomas Products 18352
• Thomas Products 18354
• Thomas Products 18355