Liquid Level Switches

Rochester Sensors’ capacitance type liquid level switches play a vital role in safeguarding critical equipment from potential damage caused by low oil, fuel, or coolant levels.

These switches find application in a wide variety of scenarios, ensuring the uninterrupted performance of engines, radiators, cooling packs, hydraulic oil tanks, coolant header tanks, compressors, e-transmissions, e-axles, and electric vehicle (EV) battery thermal management systems.

Rochester Sensors is globally recognized as a leading producer of capacitance type coolant level switches, offering a comprehensive selection of switches tailored to your specific needs. For example, liquid level switches are available with various electrical connections, thread options, and output configurations, ensuring compatibility with a wide array of applications.

The product range includes also a comprehensive selection of single and multi-point switches that set the industry standard using the reliable reed switch and magnet principle as well float switches.

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T/LL80

Liquid Level Float Switch

Electronic Liquid Level | Coolant Level |

The T/LL80 series are horizontally mounted switches for sensing water/coolant levels. Available with parallel or bulkhead type mountings these low cost switches are suitable for all radiator or coolant reservoir applications.

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Miniature Single Point Float Switch

Electronic Liquid Level | Coolant Level |

A range of miniature single level float switches used for high level or low level alarms often used in radiator and hydraulic oil applications.

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T/LL70

Multi Point Float Switch

Electronic Liquid Level | Electromechanical Liquid Level

A comprehensive range of multi-point switches using the reliable reed switch and magnet principle.

Choice of a number of switches, construction materials, reed switch rating and switching operation and electrical connections.

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HDLL70

Multi Point Heavy Duty Float Switch

Electronic Liquid Level | Electromechanical Liquid Level

HD/LL70 series is a heavy duty float level switch designed for use in environments where high switching currents and overall robustness are required.

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S275 & S276

Capacitance Level Switch with Source Output

Electronic Liquid Level |

Active switches designed to give an alarm signal if liquid falls below, or rises above, a preset level. Fitted with a Packard connector all models have a factory programmable time delay to reduce with a delay to eliminate false alarms due to turbulence.

Containing a factory programmable microprocessor, the switch provides source voltage output.

S275 switch for sensing water/coolant levels.
S276 for sensing diesel/oil levels

Datasheet S275

Datasheet S276

S281 & S282

Capacitance Level Switch with DIN Connector

Electronic Liquid Level |

An active device designed to give an alarm signal if coolant falls below, or rises above, a preset level. Fitted with a bayonet style DIN connector all models have a factory programmable time delay to reduce the risk of intermittent switching through liquid turbulence.

Containing a factory programmable microprocessor, the switch offers sink to ground or source voltage output.

S281 switch for sensing water/coolant levels.
S282 for sensing diesel/oil levels

Datasheet S281

Datasheet S282

S283 & S284

Capacitance Level Switch with Deutsch Connector

Electronic Liquid Level |

An active device designed to give an alarm signal if coolant falls below, or rises above, a preset level. Fitted with a 4 way Deutsch connector, all models have a factory programmable time delay to reduce the risk of intermittent switching through liquid turbulence and a wide selection of switching outputs.

S283 switch for sensing water/coolant levels.
S284 for sensing diesel/oil levels

Datasheet S283

Datasheet S294

S285 & S286

Capacitance Oil / Coolant Level Switch

Electronic Liquid Level |

An active device designed to give an alarm signal if liquid falls below, or rises above, a preset level. Fitted with a Packard connector all models have a factory programmable time delay to reduce the risk of intermittent switching through liquid turbulence.

Containing a factory programmable microprocessor, the switch offers sink to ground or source voltage outputs, or even both outputs on separate pins.

S285 switch for sensing water/coolant levels.
S286 for sensing diesel/oil levels

Datasheet S285

Datasheet 286

S287 & S288

Capacitance Liquid Level Switch – Flying Lead

Electronic Liquid Level |

An active device designed to give an alarm signal if liquid falls below, or rises above, a preset level. It can be specified with a delay to eliminate false alarms due to turbulence and the flying lead enables customers to specify a suitable connector of their choice.

Containing a factory programmable microprocessor, the switch offers sink to ground or source voltage outputs.

S287 switch for sensing water/coolant levels.
S288 for sensing diesel/oil levels

Datasheet S287

Datasheet S288

S291 & S292

Capacitance Type Coolant Switch with Complimentary (Flip/Flop) Voltage Output

Electronic Liquid Level |

Containing a factory programmable microprocessor, the switch provides a complimentary (flip/flop) voltage output on two pins.

S291 switch for sensing water/coolant levels.
S292 for sensing diesel/oil levels

Datasheet S291

Datasheet S292

S298

Capacitance Type Coolant Switch with Voltage Output

Electronic Liquid Level |

Containing a factory programmable microprocessor and an integral 3-pin Metripack 150 connector, this switch can be configured to provide most industry standard voltage outputs.
Its small footprint with limited intrusion into the tank means a reduced risk of damage and a wide range of customer specifiable options make it suitable for many applications.

Fitted with an integral 3-pin Packard metripack connector, all models have an inbuilt time delay to reduce the risk of intermittent switching through liquid turbulence and a wide selection of switching outputs.

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Side Entry Single Point Float Switch

Electronic Liquid Level |

A range of side entry single level float switches used for high level or low level alarms often used in radiator and hydraulic oil applications.

Most switches are mounted from the outside of the tank and can be rotaded trough 180 degree to give a choise of either open on rise or close on rise switching configuration. Optional changeover switching can be specified.

Some customization can be offered, for example should terminal tank fitting impede the operation of the switch or if a different connection method is required.

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Liquid Level Switches

T/LL80

Liquid Level Float Switch

Miniature Single Point Float Switch

T/LL70

Multi Point Float Switch

HDLL70

Multi Point Heavy Duty Float Switch

S275 & S276

Capacitance Level Switch with Source Output

S281 & S282

Capacitance Level Switch with DIN Connector

S283 & S284

Capacitance Level Switch with Deutsch Connector

S285 & S286

Capacitance Oil / Coolant Level Switch

S287 & S288

Capacitance Liquid Level Switch – Flying Lead

S291 & S292

Capacitance Type Coolant Switch with Complimentary (Flip/Flop) Voltage Output

S298

Capacitance Type Coolant Switch with Voltage Output

Side Entry Single Point Float Switch

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