Industrial paddle flow switches for water and compatible clear-liquid flow / no-flow detection in pipelines. Available with SPDT or DPDT switching, adjustable set point, weatherproof or flameproof enclosure and mounting-tee connection options for pumps, cooling circuits and process utilities.
Flow Switches are designed to monitor the presence or absence of liquid flow in pipelines and provide a switching signal for alarm, pump protection, interlocking or control applications.
Field-adjustable set-point screw for easy flow adjustment
Interchangeable paddles for different pipeline sizes
Flow Switches are designed to monitor the presence or absence of liquid flow in pipelines and provide a switching signal for alarm, pump protection, interlocking or control applications.
A paddle or vane installed in the flow stream operates the internal microswitch when the flow reaches the set point. The switching point can be adjusted using the set-point screw, while interchangeable paddles allow the same flow switch to be adapted for different pipeline sizes.
Available with weatherproof or flameproof enclosures and multiple process connection options, the Flow Switch is suitable for industrial cooling water, utility lines, process pipelines and equipment protection applications.
How it works
Working Principle
Pipeline flow acts on a paddle positioned in the liquid stream. When the flow force reaches the adjusted set point, the paddle movement operates the internal microswitch and changes the contact state.
01
Flow reaches the paddle
The clear process liquid passes the insertion paddle installed through the selected process connection.
02
Set point is reached
Increasing flow displaces the paddle against the adjustable mechanism at the configured switching point.
03
Control contact changes
The SPDT or DPDT microswitch changes state to provide an alarm, pump interlock or control action.
At a glance
Key Highlights
Field-adjustable set-point screw for easy flow adjustment
Interchangeable paddles for different pipeline sizes
Weatherproof and flameproof enclosure options available
SPDT 15 A / DPDT 2 × 5 A microswitch options
Brass, SS304, SS316 or PTFE-coated wetted parts
Range summary
Technical Specifications
Values below summarise the product family. Open an individual product for its complete model and variant data.
Fluid
Clear liquid
Specific Gravity
Up to 2.95
Flow Range
0.9 to 800 m³/h
Line Size
25 NB to 200 NB (1″ to 8″)
Mounting Connection
1″ BSP (M) / 1″ NPT (M)
Connection Options
Threaded / Flanged / Socket Weld / Butt Weld
Design Temperature
Up to 90°C; higher on request
Design Pressure
Up to 15 kgf/cm²
Enclosure
Weatherproof / Flameproof
Typical use
Applications
Pump protection and dry-run prevention
Cooling water flow monitoring
Heat exchanger and chiller flow monitoring
Spray and fire-protection line monitoring
Process line flow / no-flow detection
Lubrication and utility line monitoring
Selection confidence
Why Choose Kuncham Controls?
Adjustable switching point
The field-adjustable set-point screw makes it easy to match the switch to the required flow duty.
Interchangeable paddles
Different paddles allow the same switch family to be configured for different pipeline sizes.
Enclosure choice
Weatherproof and flameproof enclosure options support different installation environments.
Material flexibility
Brass, SS304, SS316 and PTFE-coated wetted-part options support a range of compatible clear-liquid services.
Support
Questions & Answers
What does the Flow Switch detect?
It detects whether clear-liquid flow has reached the adjusted switching point and changes an electrical contact for alarm or control.
Which switch configurations are available?
The SPDT option is rated 15 A. The DPDT option uses two SPDT switches rated 5 A each.
Which line sizes are covered?
The standard range covers 25 NB to 200 NB, equivalent to 1 inch to 8 inches.
Which enclosure options are available?
Weatherproof and flameproof enclosure options are available according to the installation requirement.
What information is needed for selection?
Provide the liquid, required flow set point, line size, pressure, temperature, process connection, wetted material and enclosure requirement.
