PRODUCT

Sensor ASM / Applications

Capacitance Level Sensor
The capacitance level sensor measures the level (height) of liquids or powders using capacitance. It consists of two electrodes inserted into the container, and the capacitance between these electrodes changes based on the level of liquid or powder inside the container.
There are two methods of using electrodes: using a bare electrode as an electrode and using a sheathed electrode coated with an insulator. The former is used in an insulating liquid or powder, utilizing the dielectric constant of the liquid or powder itself. The latter is used in a conductive liquid or powder, and the change in capacitance due to the level of the liquid or powder is typically measured as a change in the resonant frequency of an LC resonant circuit. Capacitive level sensors can be applied to many liquids or powders and have relatively high precision.
Characteristics Symbol Test Condition Min Typ Max Unit
Operating supply voltage VDD 3.5 3.3 5 V
Current consumption IDD VDD=3.3V 230 uA
VDD=5.0V 285
Output maximum sink IOUT TA=25°C 4.0 mA
Current
Internal reset VDD voltage VDD_RST TA=25°C 1.9 2.1 V
Sense input CS 10 100 pF
Capacitance range
[Note2]
Reference input CR 12 100
capacitance range
Sense input RS 200 1000 Ω
Resistance range
Minimum dedtectable ΔCS CS=10pF 0.2 pF
Capacitance variation
Output impedance ΔCS > 0.2pF 12 Ω
(open drain) ZO ΔCS < 0.2pF 30M
Maximum supply voltage TR_VDD 100 ms
Rising time

1-1. 1 Point level type capacitive sensor

The water level sensor applied to water purifiers is a structure that is installed as a set and fixed with a KEY.

Measured Distance 1mm~3mm
Precision ±0.5mm
Repeatability ±0.2mm
Voltage 3~5/DC
Using Temperature 0℃ to +70℃

1-2. 2 point level type capacitive sensor

This is a water level sensor designed to be applied to water purifiers, and it is structured to be fixed with a key after installation in the set. It can measure two stages (such as low water level and full water level) with a single sensor.

Measured Distance 1mm~3mm
Precision ±0.5mm
Repeatability ±0.2mm
Voltage 3~5/DC
Using Temperature 0℃ to +70℃

1-3. Level(bracket) type capacitive sensor

The level sensor applicable to bidet, designed to be installed as part of a set and securely fastened with screws.

Measured Distance 1mm~3mm
Precision ±0.5mm
Repeatability ±0.2mm
Voltage 3~5/DC
Using Temperature 0℃ to +70℃

1-4. Pin level type capacitive sensor

The sensor is designed to detect the capacitive sensing part using STS pins rather than injecting into the PCB, allowing assembly with screws.

Measured Distance 1mm~3mm
Precision ±0.5mm
Repeatability ±0.2mm
Voltage 3~5/DC
Using Temperature 0℃ to +70℃

1-4-1. Pin level type capacitive sensor

As a sensor for measuring the height of air conditioner condensate, it is capable of measuring both 2 points and 3 points. Typically, the short pin side is used for water overflow detection function, while the long pin side is used for condensate detection.

Measured Distance 1mm~3mm
Precision ±0.5mm
Repeatability ±0.2mm
Voltage 3~5/DC
Using Temperature 0℃ to +70℃

1-5. 2 point pin level type capacitive sensor

The sensor is designed to detect the capacitive sensing part using STS pins instead of injecting into the PCB and can be assembled with screws. It is designed to detect two levels and uses 3 pins to detect the level structure.

Measured Distance 1mm~3mm
Precision ±0.5mm
Repeatability ±0.2mm
Voltage 3~5/DC
Using Temperature 0℃ to +70℃

1-6. Seat sensor (body detection sensor) capacitive sensor

This sensor is specialized for human body detection rather than detecting the general water level. It is installed inside the bidet toilet seat to detect whether a person is sitting on it.

Supply Voltage 3~5V DC
Power Dissipation 100mW
Storage Temperature -20℃ to +85℃
Operating Temperature Range -10℃ to +75℃