Liquid Level Sensor Horizontal Type

Water Liquid Level Sensor Horizontal Type

Float Mechanical Switch Boiler Container Storage Tank Pool Aquarium Pump Hydroponic Plastic 10W NC

     The horizontal type liquid level sensor is a float switch that is mounted on the side wall of containers filled with liquid, such as tanks, storage tanks and boilers, and detects the liquid level. As the liquid rises and falls, the magnetic moving float turns on its hinge and opens or closes the reed switch in the body. The sensor gives a dry contact output; it is used to switch on or off devices such as a pump, indicator, alarm and similar. This way you can see whether your tank is full or empty.

     Depending on the direction in which it is installed, the sensor works as normally open (NO) or normally closed (NC); when the body is mounted upside down the contact logic changes. In the horizontal position parallel to the sensor body it is NC, that is, short circuit. It is used horizontally in containers, boilers, storage tanks, rooms and similar places holding liquids; it can be placed above the liquid or inside the liquid. Depending on the mounting direction, water present or water absent detection is achieved. Connection types and the working principle can be seen in picture number 8.

     The switches in this type of sensor can only drive low power loads. In applications where high current will flow, the sensor must not be used directly; after the sensor a component such as a relay or contactor must be used in between. If the sensor switch is short circuited, the product has failed due to high current; it cannot be repaired. Thanks to its M16 threaded body, nut and gasket it is mounted leak-proof on a plastic or metal tank wall with a 16mm hole.


Features:

• Product type: Horizontal type (side mount) float liquid level sensor
• Switch type: Reed switch, operated by a magnetic float
• Contact: Single contact, NO or NC depending on the mounting direction; NC (short circuit) in the horizontal position parallel to the sensor body
• Switching power: Max 10W (voltage x current; max about 0.4A at 24V, max 0.1A at 100V)
• Maximum switching voltage: 100V DC
• Maximum switching current: 0.5A
• Breakdown voltage (contact open): 220V DC
• Output: Dry contact, 2-wire cable (non-polarized)
• Operating temperature: -10°C - 80°C
• Mounting: M16 threaded body, 16mm mounting hole, with nut and gasket
• Mounting direction: Horizontal on the tank side wall; mounting upside down changes the NO / NC logic
• Compatible systems: Arduino, ESP32, PLC digital input, low voltage (e.g. 12V or 24V DC) relay coil
• Usable with: Water and liquid filled tanks, storage tanks and containers
• Material: Plastic
• Color: Black
• Cable length: 40cm
• Body length: 60mm
• Total sensor length: 85mm
• Weight: 25gr

Usage information:

• Drill a 16mm hole in the tank wall, insert the sensor from the inside with its gasket and fix it by tightening the nut from the outside. Check that the float can move up and down freely.
• When using with a control board or PLC digital input, connect one end of the 2-wire cable to the input and the other end to GND; the input must have a pull-up resistor. The cable is non-polarized, so the ends can be swapped; when the contact closes the input is pulled to GND level.
• If a pump, solenoid valve or 220V device is to be driven, connect the sensor to the coil circuit of a low voltage (e.g. 12V or 24V DC) relay; run the load through the relay or contactor contact. A 220V contactor coil must not be driven directly by the sensor (100V DC and 10W limit).

Application areas:

•  Water tank and storage tank level control
•  Boiler water level detection (liquid up to 80°C)
•  Aquarium automatic top-off
•  Hydroponic and greenhouse nutrient tanks
•  Irrigation system tank control
•  Pump dry run protection and automatic filling
•  Pool and pond level control
•  Coffee machine, humidifier and water dispenser reservoirs
•  Overflow and leakage alarm
•  Training and hobby projects with Arduino and ESP32
   

Points to consider:

•  The sensor contact is rated at max 10W, 0.5A and 100V DC; all three limits apply together (voltage x current does not exceed 10W). Do not connect high current or inductive loads such as pumps and motors directly; always put a relay or contactor in between.
•  A relay coil is an inductive load: connect a reverse parallel diode (e.g. 1N4007) across a DC relay coil; the voltage spike at switch off can weld the reed contact.
•  The liquid temperature must stay within -10°C - 80°C; check the temperature in hot water boilers.
•  If the sensor switch is short circuited, the product has failed due to high current; it cannot be repaired.
•  Check the NO / NC logic with a multimeter before mounting; the mounting direction of the sensor changes the contact logic.
•  There must be no tank wall, pipe or other part in the float's movement area; if the float cannot move freely the level is not detected.

Package contents:

•  1 Piece Liquid Level Sensor Horizontal Type
•  1 Piece nut and gasket ( Assembled )