1" NPT External Thread Johnson Controls F61kb-11c Water Flow Switch

• Customization: Available
• Type: Mechanical
• Usage: Control Switch, Liquid Flow Switch
• Model NO.: PC-403
• Application: HVAC and Industrial Cooling Systems
• Explosion-proof Type: Flameproof
• Contact Type: Spdt
• Certification: CE
• Model No.: F61kb-11c
• Interface Specification: 1" NPT External Thread
• Rated Load: 120/208/240/277 VAC
• Full Load Current: 16.0/8.8/8.0 a
• Insulation Resistance: >100 MΩ
• Withstand Voltage Rating: AC 1500V / 1 Minute
• Maximum Operating Pressure: 10 Bar (1034 Kpa)
• Medium Temperature: -29°C ~ 121°C
• Ambient Temperature: 0°C ~ 60°C
• Compatible Media: Water, Ethylene Glycol, Lubricating Oil etc.
• Contact Life: 500,000 Cycles
• Blade Material: 304 Stainless Steel
• Connector Material: Brass / Phosphor Bronze
• Housing: NEMA 1 Metal Housing
• Protection Rating: IP67
• Transport Package: Carton Packaging
• Specification: F61KB-11C
• Trademark: Thermal International
• Origin: China
• Package Size: 15.00cm * 9.00cm * 6.00cm
• Package Gross Weight: 0.400kg

Product Description

Product Description

1" NPT External Thread Johnson Controls F61KB-11C Water Flow Switch

This is the Johnson Controls F61KB-11C target-type flow switch (also called a liquid flow switch), an industrial-grade fluid control component primarily used to monitor liquid flow in pipelines. It triggers the switch when the flow rate reaches or falls below a set threshold, achieving equipment interlock protection.

Product Introduction:

       The F61KB-11C is a standard flow rate type flow switch in Johnson Controls' F61 series. It uses a target-type (vane-type) mechanical sensing principle. A stainless steel vane inserted into the pipe senses the fluid flow. When the flow velocity reaches a set value, the vane deflects, triggering an internal microswitch and outputting an SPDT (single-pole double-throw) contact signal.
       It is specifically designed for non-corrosive, non-hazardous liquids such as water and ethylene glycol, and is widely used in HVAC, refrigeration, and industrial cooling applications requiring flow interruption protection or flow interlocking.

Product Features:
I. High Reliability: Purely mechanical structure, no electronic components, resistant to electromagnetic interference, and highly stable in industrial environments.
II. Flexible Adaptability: Standard multi-segment stainless steel blades can be cut or assembled to fit different pipe diameters from 1" to 6"; flow threshold is adjustable.
III. Precise Control: SPDT contact output allows simultaneous control of two circuits, achieving "shutdown upon flow interruption" interlock protection.
IV. Industrial-Grade Certification: Compliant with NEMA 1 standards, IP67 protection, suitable for humid and dusty industrial environments.
V. Easy Installation: Threaded direct connection design, no complex tools required, allows for quick integration into piping systems.

Specification

Product Name	Paddle Type Water Flow Switch
Model Number	F61KB-11C
Interface Specifications	1" NPT external thread (fits DN25 pipe)
Electrical Performance	Contact Type: SPDT (Single Pole Double Throw) Rated Load: 120/208/240/277 VAC, corresponding to full load current of 16.0/8.8/8.0 A Insulation Resistance: >100 MΩ Contact Life: 500,000 cycles
Fluid Parameters	* Maximum operating pressure: 10 bar (1034 kPa) * Medium temperature: -29°C ~ 121°C (slight variations depending on the sub-model) * Ambient temperature: 0°C ~ 60°C * Suitable media: Water, ethylene glycol, lubricating oil, and other non-corrosive liquids
Mechanical Properties	- Blade material: 304 stainless steel (standard configuration includes 1", 2", and 3" three-section blades, with an additional 6" spare blade) - Connector material: Brass / Phosphor bronze - Housing: NEMA 1 metal housing, IP67 protection rating
Adjustment Method	The trigger flow threshold is set via the adjustment screw inside the housing.

Application Scenarios:

- HVAC: Water flow monitoring for central air conditioning chillers, fan coil units, and cooling towers to prevent dry burning.
- Industrial Refrigeration: Flow interruption protection for chillers and freezers to prevent evaporator icing or compressor damage.
- Industrial Cooling Systems: Flow interlocking for machine tool spindle cooling, electroplating production lines, and hydraulic pump stations.
- Water Treatment and Boilers: Flow status detection and alarm for boiler feedwater and circulating water systems.

Product Pictures

Workshop Pictures

Packaging & Shipping

Certifications

FAQ

FAQ

Q1 Are you trader? 
A1 We are factory.
 
Q2 What's your lead time for 5000pcs?
A2 We need around 20days after down payment received. .
 
Q3 You payment term?
A3 We accept LC, T/T 20% remittance +80% before delivery, DP.
 
Q4 Can we print our LOGO on heating element?
A4 Yes.
 
Q5 Do you offer guarantee? 
A5 Yes. We offer 1 year guarantee.