Kelco C25 25mm Magnetically Operated Piston Inline Flow Switch

The Kelco C25 Series Inline Flow Switch is a compact, magnetically actuated piston switch designed for reliable flow detection in clean liquids, including fresh water, seawater, and diesel. With all-position mounting and a one-piece brass body, it is ideal for pressure boosting, pump control, and industrial automation.

Available in two models — C25-B with a dry contact reed switch for PLC, telemetry, and relay logic control, and C25-R with a 40A solid-state switch for direct control of single-phase AC motors up to 3kW (4HP). The sealed electrical module can be removed without disturbing pipework and rotated or reversed for flexible installation.

Supplied with interchangeable pistons and a non-magnetic piston retainer, the C25 allows users to adjust flow sensitivity, detecting as low as 0.28 L/min. It handles liquids up to 90°C (100°C short term), pressures up to 100 bar, and has very low head loss.

FEATURES

• Australian-made heavy-duty inline flow switch
• Magnetically actuated piston – detects very low flows
• Brass body with polypropylene components for durability
• All-position mounting for maximum installation flexibility
• Reed switch model (C25-B) for control/monitoring circuits
• Solid-state model (C25-R) for direct AC motor control up to 3kW
• Supplied with 3 piston options and non-magnetic retainer for sensitivity adjustment
• Weatherproof IP56 housing
• Static/dynamic pressure rating up to 100 bar (1450 psi)
• Max flow rate: 100 L/min
  

APPLICATION

• Pressure boosting systems
• Pump protection and control
• Safety shower flow detection (C25-B recommended)
• Diesel and oil flow monitoring (C25-B-D)
• PLC, telemetry, and relay logic circuits
• Direct motor control (C25-R model)
  

SPECIFICATIONS

• Connection: 1” BSP or NPT thread
• Liquid temp: -20°C to 90°C (100°C short term)
• Max pressure: 100 bar
• Switch type: SPST Normally Open
• C25-B rating: 40W, 0–240V AC / 200V DC, 1A max
• C25-R rating: 3kW, 5–240V AC, 40A max (10mA min)

CONSTRUCTION

• The C25 flow switch consists of a sealed electrical switching module that saddles a one-piece metal body.
• The self contained electrical modules fitted to the flow switches is easily removed without disturbing pipework, and can be reversed or rotated independently of the switch body.
• Within the metal body of the flow switch a free fitting magnetically suspended piston actuates the switch as soon as flow starts.

SWITCH POINT DATA

• Switching point and sensitivity to flow depends on liquid velocity, viscosity and piston clearance.
• To give users as wide a choice as possible, three pistons and a non-magnetic piston retainer are supplied with the C25 flow switches.
• The three pistons allow the choice of a high, low or intermediate range of switching thresholds.

INSTALLATION

The C25 flow switches can be positioned in any orientation in pipework. In vertical piping, flow can be either upward or downward through the switch with very little difference in flow sensitivity. The C25 flow switch is suitable for use with hot or cold liquids up to 90°C. Systems can be steam sterilized at 100°C for short periods without damaging the switch.

ELECTRICAL APPLICATION:

All C25 flow switches are single pole single throw normally open switches that switch on in response to flow. The model C25-B is suitable for PLC use, data logging, telemetry systems, relay logic circuits, or any light duty control application in either AC or DC circuits. It is rated at 0 to 240V AC at 40Watts maximum switched power. The model C25-R is suitable for AC use only, and can directly control any AC motor load up to 3kW 4HP. The C25-R will not operate in DC circuits or in circuits that draw less than 10mA.

ENVIRONMENT:

• Max. Liquid Temp.:  90°C, 100°C for short periods
• Min. Liquid Temp.:  -20°C
• Max. Liquid Pressure:  100 Bars (1450 PSI)
• Ingress Protection Rating:  IP56

ELECTRICAL DATA: