Float level switch
The AT 120 level switch is a float level switch, specifically designed for automatic pump control in demanding and corrosive environments where the liquid is agitated. Indeed, thanks to its large differential angle, the AT 120 HR HY establishes a stable and smooth level contact, effectively protecting pump motors and electrical devices.
Its double Hypalon casing and specific shape guarantee a reliable solution for industrial and wastewater applications.
⚠️ Warning: due to its design, the AT 120 HRHY is not recommended for slow filling rates. In this case, opt for the SOBA HR HY level regulator, better suited to this type of application.
100% French design and manufacturing.
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Drainage or FillingThe AT 120 HR HY float level switch operates on the principle of tilt-based level detection.
The float is equipped with a three-conductor cable (COM, NO, NC), allowing the operating mode to be selected during wiring: Used in pair with another float of the same type, it allows regulating the minimum and maximum levels of a tank.
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In drainage mode, the float level switch triggers the pump start in the high position (overflow protection). An electric current passes through the float to the connected device (control relay, pumps, valves, alarms).
Once the tank is empty, the float level switch cuts the electrical circuit to protect the equipment (pumps) in the absence of water in the tank.
In filling mode, the electrical circuit inside the switch closes (NC) when the switch is in the low position. Thus, the pump starts to fill the tank.
Ballast positioningThe triggering of the float level switch (switching angle) may vary depending on liquid agitation, filling/drainage flow rate, but especially depending on the ballast positioning or fixing point. Indeed, the cable length between the counterweight and the float switch determines the amount of liquid that rises or lowers to cause the float switch to change state. You have the possibility to adjust the counterweight on the device cable to optimize its operation. |
You have the possibility to adjust the counterweight on the device cable, thus the greater the distance between the ballast and the float, the greater the level difference will be, consequently the greater the switching angle will be.
This allows the float to adapt to possible turbulence in the liquid but also allows the float to work in a wide range of densities.
Below are indicative values for the BIP STOP with minimum and maximum cable length to ensure proper operation:
Min. value Y = 10cm > X ≈ 30-35 CM
Max. value Y = 30cm > X ≈ 60-65 CM
To adjust the ballast on the cable, simply pull on the plastic or resin ballast to unclip it from the clamping ring or O-ring. Then, slide the clamping ring/O-ring to the desired location and replace the ballast on top, so that the weight is locked on the cable.
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Float fixingThe float level switch can be suspended via the cable sheath, using the FIXCAB cable fixing accessory, which allows proper fixing of the electrical cable at the desired height and allows precise adjustment at any time. Be careful when using clamps or other elements during fixing that can damage the cable and deteriorate the device by allowing water to enter inside the float level switch by capillarity.
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Electrical connectionIn outdoor or humid spaces, the electrical connection of the float level switch must be watertight and properly insulated in a hermetic box, thus preventing water or other contaminants from entering the cable. This helps prevent water infiltration that could compromise the safety of electrical connections as well as the float's lifespan. The electrical connection box must never be placed inside the tank. The cable and its capillary can be extended using a standard signal cable. We equip our floats with the cable length you desire to avoid connections that would harm their operation.
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Unlike flat sensors, the AT 120 HR HY float level switch offers omnidirectional detection. Its shape allows it to react to water movements regardless of its position in the liquid.
This ensures more reliable detection, especially in agitated environments or those subject to turbulence.
Thanks to its HR HY (High Resistance HYpalon) double jacket vulcanized under press, the AT 120 HR HY float level switch ensures level control in aggressive liquid mixtures with complete reliability. |
The shape of the AT 120 HR HY float level switch is specially designed to prevent impurity accumulation on its body, thus preserving its performance and longevity over time. No maintenance required.
Cable fixing accessory (FIXCAB) highly recommended for all suspended floats.
Ideal multifunction socket for pump control.
Adjustable ballast is essential for proper float operation.
Water level control relay with alarm.
To best define the float level switch suited to your needs, ATMI offers a wide range of level switches for liquids and solids in various applications.
