Liquid Level Sensors

Polypropylene or 316L Stainless Steel Extension Tubes Float Switches A range of extension tubes available in Polypropylene or SS 316L, which extend the reach of the various vertical float switches. Polypropylene tubes, with either M12 or M16 threads, are intended for use with our plastic types of float switches and are available in 250mm, 500mm and 750mm lengths. The SS 316L extension tubes, with either 1/8BSP (G1/8) or 3/8BSP (G3/8), are intended for use with our stainless steel float switches.

Float Switches for Exposed Tanks or Turbulent Liquid The FFSMC Float Switch series is suitable for open reservoirs and turbulent water and industrial wastewater. The switching element is self cleaning with 10 Amp contacts, and makes the complete switch insensitive to humidity and condensation, caused by wide temperature fluctuations. The switch is fitted with additional internal weight, such that it brings the centre of gravity and rotation close to the cable entry. Also avaialble as WRAS Approved, see FFSMC WRAS.

The LLF40 series is designed as a compact internal fitting device, with a wide range of options, making this ideal for size sensitive applications. Mounting of this series requires access to the inside of the tank. These devices are particularly suitable for detecting low levels of liquids in the bottom of tanks and containers, and for lower SG liquids. Typical applications include vending machines, commercial washing machines and evaporator units. They are manufactured in a variety of materials with a choice of gasket materials, to suit most commonly used liquids. The switch action may be reversed by rotating the device through 180º. Available with flying leads or M12 socket for electrical connection. Cable sets with M12 plugs are also available. Custom versions can be made for particular applications. Key Features: Compact Internal Fitting, Low Level, Low S.G. Float Switch Suitable for Low Specific Gravity Liquids (0.7 S.G.) Very Low Level Sensing Class Leading Compact Design Flying Lead or M12 Plug Connection Available in Nylon, Polypropylene, PPS or PVDF 25 VA & 100 VA Versions Many Variants Are UL Recognised Components File No. E171218 Many Variants Have WRAS and/or UL Approval

Plastic; Vertical Fast Lift Float Switches The LLF Float Switches are designed for applications where very low levels of liquid need to be detected. The float will lift in as little as 6mm liquid and in SG as low as 0.45.

The LLF70 series is designed for fitting through a tank wall from the outside, where access to the inside for fitting is not possible.These devices are particularly suitable for detecting low levels of liquids in the bottom of tanks and containers, and for lower SG liquids. They are manufactured in a variety of plastics, with a choice of gasket materials, to suit most commonly used liquids.Typical applications include vending machines, commercial dishwashers and auxiliary tanks on vehicles. The switch action may be reversed by mounting the device with the float able to move upwards away from the body, instead of the more normal downwards direction. Available with either flying leads or M12 socket for electrical connection. Cable sets with M12 plugs are also available. Key Features: Compact, External Fitting, Low Level, Low S.G. Float Switch Suitable for Low Specific Gravity Liquids (0.7 S.G.) Very Low Level Sensing Class Leading Compact Design Compression Seal Fitting Flying Lead or M12 Plug Connection Available in Nylon, Polypropylene, PPS or PVDF 25 VA & 100 VA Versions Many Variants Are UL Recognised Components File No. E171218 Many Variants Have WRAS and/or UL Approval  

Float Switches for Turbulent Liquids and Confined Spaces The LM series Float Switch is suitable for use in water, industrial wastewater and sewage, that can have wide variations of temperature. This compact design of switch is for use in more confined spaces, where there is not enough room for the larger FFSMC type. The rounded body design and floating attitude prevents accumulation of solids on the body. The switch has additional internal ballast, to bring the centre of gravity and rotation close to the cable entry point.

High Power Float Switches for Indoor or Covered Tanks The MS Float Switch series is designed for use in non-turbulent water, with fairly constant ambient temperature, such as in indoor tanks or covered reservoirs. The switching element is a microswitch, having UL, VDE and CENELEC approvals, with either 10 or 20 Amp contacts, activated by a moving ball and having an electrical life of 200,000 operations.

The OLS2 series is a liquid level sensor for single point liquid level detection. The sensor has an infra-red emitter and detector aligned within an accurately shaped cone to give good optical coupling when the sensor is in air. This coupling is greatly reduced, when the sensor is immersed in liquid, as the infra-red light escapes through the liquid rather than being reflected back to the detector. The sensor has a transistor output, so can be configured by the user for particular applications. Output is via TTL compatible push pull output. Key Features: Optical Liquid Level Sensor - External M12 Mount Low-cost Sensors for General Liquid Sensing High-reliability Optical Sensing External Mount via M12x1 Thread Standard Temperature Range -25ºC to +80ºC, Extended Temperature Range -40ºC to +125ºC High and Low Output Versions Resistant to False Triggering Caused by Foaming Body Material: Polysulfone UDEL 1700 Maximum Pressure: 7 bar Tightening Torque for Fixing: 1.5 Nm Mounting Hole: 12 mm Cable Length Standard: 25 cm Wire Size: 24AWG Cable Conductor Material: Tinned Copper Wire Sheath Material: PTFE Wire Temperature Rating: +125ºC Sealing Gasket Not Supplied Supply Voltage (Vs): 4.5 to 15.4 VDC or 10 to 28 VDC Max. Supply Current (Is): 2.5 mA (Vs = 15.4 VDC) Output Type: Voltage High or Low (L in Part Number Indicates Low) Output Voltage (Vout) @ lout =100 mA: Output High Vout = Vs - 1 Vmax, Output Low Vout = 0.5 Vmax Output Sink & Source Current lout: 100 mA Max. or 1 A

The OLS5 series is a liquid level sensor for single point liquid level detection. The sensor has an infra-red emitter and detector aligned within an accurately shaped cone to give good optical coupling when the sensor is in air. This coupling is greatly reduced, when the sensor is immersed in liquid, as the infra-red light escapes through the liquid rather than being reflected back to the detector. The sensor has a transistor output, so it can be configured by the user for particular applications. Output is via TTL compatible push pull output. Key Features: Optical Liquid Level Sensor - Internal Mount Low-cost Sensors for General Liquid Sensing High-reliability Optical Sensing Internal Mount via M10x1 Thread Standard Temperature Range -25ºC to +80ºC, Extended Temperature Range -40ºC to +125ºC High and Low Output Versions Resistant to False Triggering Caused by Foaming Body Material: Polysulfone UDEL 1700 Maximum Pressure: 20 bar Tightening Torque for Fixing: 1.5 Nm Cable Length - Standard: 25 cm Wire Size: 24AWG Cable Conductor Material: Tinned Copper Wire Sheath Material: PTFE Wire Temperature Rating: +125ºC Sealing Gasket & Nut Not Supplied Supply Voltage (Vs): 4.5 to 15.4 VDC Supply Current Max. (Is): 2.5 mA (Vs = 15.4 VDC) Output Type: Voltage High or Low Output Voltage (Vout) @ lout = 100 mA: Output High Vout = Vs-1 Vmax, Output Low Vout = 0.5 Vmax Output Sink & Source Current lout: 100 mA Max.  

The OLS7 series is a liquid level sensor for single point liquid level detection. The sensor has an infra-red emitter and detector aligned within an accurately shaped cone to give good optical coupling when the sensor is in air. This coupling is greatly reduced, when the sensor is immersed in liquid, as the infra-red light escapes through the liquid rather than being reflected back to the detector. The sensor has a transistor output, so it can be configured by the user for particular applications. Key Features: Optical Liquid Level Sensor 1/4”NPT Mount Low-cost Sensors for General Liquid Sensing High-reliability Optical Sensing External Mount via 1/4”NPT Thread Standard Temperature Range: -25ºC to +80ºC Extended Temperature Range: -40ºC to +125ºC High and Low Output Versions Resistant to False Triggering Caused by Foaming Body Material: Polysulfone UDEL 1700 Maximum Pressure: 7 bar Tightening Torque for Fixing: 1.5Nm Cable Length - Standard: 25 cm Wire Size: 24AWG Cable Conductor Material: Tinned Copper Wire Sheath Material :PTFE Wire Temperature Rating: +125ºC Sealing Gasket Not Supplied Supply Voltage (Vs): 4.5 to 15.4 VDC or 10 to 28 VDC Supply Current Max (Is): 2.5 mA (Vs = 15.4 VDC) Output Type Voltage: High or Low Output Voltage (Vout) @ lout =100 mA: Output High Vout = Vs-1 Vmax, Output Low Vout = 0.5 Vmax Output Sink & Source Current lout: 100 mA Max. or 1 A  

Plastic; Internal Mount Drop Float Switches The RSF10 series drop Float Switch has been designed to eliminate problems associated with limescale build up around the pivot point of a conventional float switch. It is also suitable in more viscous liquids, that might affect the pivot action of a standard float type. The drop float actuator allows the switch housing and float pivots to be located above the surface of the liquid and provides normally closed switch contact, opening as the liquid level rises.

The RSF150 series are compact vertically mounted devices with a single switch point. Mounting is either from the top or bottom of a tank from the inside, so requires access to the inside of the tank. These float switches have M12 circular connectors for electrical connection. Cables are available for use with M12 connectors. Typical applications include vending machines, printing systems and chemical dosing equipment. These switches can be manufactured in a variety of plastics, with a choice of gasket materials, to suit most commonly used liquids. The switch action may be reversed by removing the float, inverting it, then refitting to the stem. Key Features: Compact Internal Fitting Vertical Switch Electrical Connection via M12 Connector Available in Nylon, Polypropylene, PPS & PVDF 25 VA & 100 VA Versions Many Variants are UL Recognised Components File No. E171218 WRAS & NSF Approved Versions

The RSF166 float switch series is designed to offer a number of switching options to meet a variety of system requirements. These float switches are manufactured in PPS (Polyphenylene Sulphide), which are compatible with a wide range of liquids, and are mounted externally via a nitrile compression seal and a 22 mm diameter hole in the tank. The single float types are generally used in systems with PLC control of processes. The dual float versions can be used for controlling the filling or emptying of tanks via electromechanical relays. Key Features: Dual Switch Point Series - External Mount External Mount via Compression Seal High & Low Level Switching PPS Material Versions for Filling or Emptying Control UL Recognised Components File No. E171218 WRAS Approved Material: PPS Colour: Grey Temperature Range: -10°C to +85°C Minimum Liquid SG: 0.85 Standard Cable Length: 100 cm Max. Switching Power: 25 VA Max. Switching Voltage AC: 240 VAC Max. Switching Voltage DC: 120 VDC Max. Switching Current: 0.6 A

The RSF166P float switch series is designed to offer a number of switching options to meet a variety of system requirements. These float switches are manufactured in PPS (Polyphenylene Sulphide), which is compatible with a wide range of liquids, and are mounted externally via a 22mm hole and nitrile compression seal. The single float types are generally used in systems with PLC control of processes. The dual float versions can be used for controlling the filling or emptying of tanks via electromechanical relays. Key Features: External Mount, Dual Switch Point Series with 4-PIN M12 Connection External Mount via Compression Seal High & Low Level Switching PPS Material Versions for Filling or Emptying Control M12 4-pin Connection for Quick Connection to Circuit UL and WRAS Approved Material: PPS Colour: Grey Temperature Range: -10 °C to +85°C Minimum Liquid SG: 0.85 Standard Cable Length: 100 cm Max. Switching Power: 25 VA Max. Switching Voltage AC: 240 VAC Max. Switching Voltage DC: 120 VDC Max. Switching Current: 0.6 A

Plastic; Internal Mount Drop Float Switches for Low Level The RSF20 Float Switch is designed to eliminate the problems associated with limescale build up around the pivot point on a conventional float switch.This particular series is primarily for applications where a low level condition has to be monitored, in a system where the liquid is usually maintained at a high level,or where a wider differential is required between the opening and closing levels.

Plastic; High Power Internal Fitting Float Switches The RSF30 Float Switch series is a range of higher power side entry, internally fitted devices. These may be used for directly switching some small loads of less than 100VA.Mounting of this series requires access to the inside of the tank. They are manufactured in Nylon or Polypropylene, with a choice of gasket materials, to suit most commonly used liquids. The switch action may be reversed by rotating the device through 180¡.

Plastic; Compact Internal Fitting Float Switches The RSF40 series is designed as a compact internal fitting device, with a wide range of options, making this ideal for size sensitive applications. This Float Switch is fitted through the tank wall from the inside, via an M16 thread, so requires access to the inside of the tank.

Plastic; Compact Internal Fitting Mount Float Switches The RSF50 Float Switch series are compact vertically mounted devices with a single switch point. Mounting is in the top or bottom of the tank from the inside, so requires access to the inside of the tank. Typical applications include printing systems and chemical dosing equipment. They are manufactured in a variety of materials, with a choice of gasket materials, to suit most commonly used liquids.

Plastic; Variable Insertion Depth Float Switches The RSF64EXS is a vertical float switch, with either normally open or normally closed (when the float is down) switching action, permanently coupled to a 300mm PVC tube. This provides a float switch, whose overall depth can be varied between 150mm and 450mm, by adjusting its position in a sliding clamp. Further 306mm PVC extension tubes may be added, up to a maximum of three, to provide insertion depths up to 1350mm.

The RSF66 float switch series is designed to offer a number of switching options to meet a variety of system requirements. These switches are manufactured in PPS (Polyphenylene Sulphide), which is compatible with a wide range of liquids. The single float types are generally used in systems with PLC control of processes. The dual float versions can be used for controlling the filling or emptying of tanks via electromechanical relays.  Key Features: Dual Switch Point Series High & Low Level Switching PPS Material Versions for Filling or Emptying Control Many Variants are UL Recognised Components File No. E171218 WRAS and NSF Approved Colour: Grey Temperature Range: -10°C to +85°C Minimum Liquid SG: 0.85 Standard Cable Length: 100 cm Max. Switching Power: 25 VA Max. Switching Voltage AC: 240 VAC Max. Switching Voltage DC: 120 VDC Max. Switching Current: 0.6 A    

Plastic; Dual Switch Point PPS Float Switches The RSF66 Float Switch series has been specifically designed to offer the user a long reach float with a number of switching options to cater for a variety of system requirements. Manufactured from high grade Polyphenylene Sulphide (PPS) the RSF66 is compatible with most liquids and chemicals offering switching capabilities up to 240V AC. The two float range provide Make/Make, or Break/Break, switch action with a choice of 50 or 100mm separations.

Plastic; Compact External Fitting Float Switches with Compression Seal The RSF70 Float Switch series is designed for external fitting, achieved with a high grade compression seal. This avoids the need for access to the inside of the chamber and is ideally suited to applications where space or fitting time are prime considerations. They are manufactured in a variety of materials, with a choice of gasket materials, to suit most commonly used liquids. The switch action may be reversed by rotating the device through 180º.