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SW-12

SW-12 water level sensor

SW series water level sensor is a component designed for checking water level. According to the water level, the product sends oscillation frequency to the appliance’s control board. It depends on the pressure, magnetic field, and electric signal to realize the function.

TEST CONDITIONS

1.Temperature 25℃±5

2.Humidity:  45%75%

3.Atmospheric pressure 86kPa106kPa




TECHNICAL REQUIREMENTS

TEST ITEM

TECHNICAL REQUIREMENTS

TEST METHOD

INSTRUMENT

Rated voltage

DC5V±0.2V   10mA

Measure

Digital multimeter

Appearance

No rust on metal surface, no crack or deformation on plastic surface, no exposed bottom, cracks, bubbles or shrink holes on internal coating. Markings should be clear. 

Visual

/

Rated temperature

10℃~+60

Measure

thermometer 


Dimension

Meet the requirements of the specified values in the drawings or technical specifications 

Measure

Vernier caliper/projector 

Curve

The frequency and its corresponding pressure relationship set under normal temperature and humidity should meet the requirements specified in the drawings or technical specifications 

Measure

Digital frequency meter

pressure gauge

Air tightness

Measured with a standard water pressure gauge, pressurized for 1 minute at a pressure of 7.6kPa, the pressure sensor should not leak

Test

Air tightness test deck

Electrical strength

Apply 1500V, 50Hz, or 1800V/s between the conductive part of the pressure sensor and the mounting hole, and there should be no breakdown or flashover.

Test

Withstand Voltage Tester

Insulation resistance

The insulation resistance between the conductive part and the exposed

Test

Insulation Resistance Tester

High temperature

After placing the product in a constant temperature test box at 70°C±2°C for 168h and placing it in room temperature and humidity for 0.5h, there should be no cracks in the plastic parts, and the water level change of each gear is less than 15mm 

Test

High and low temperature test chamber


Digital frequency meter
pressure gauge 


Low temperature

After placing the product in a constant temperature test box at -20°C±2°C for 168h, and placing it in room temperature and humidity for 0.5h, there should be no cracks in the plastic parts, and the water level change of each gear is less than 15mm


Test

High and low temperature test chamber


Digital frequency meter
pressure gauge 


Thermal shock

Place the pressure sensor at a high temperature of 80°C±2°C for 1h, a room temperature of 20°C±2°C for 30 minutes, a low temperature of -20°C±3°C for 1 hour, totally 20 cycles. After recovery for 0.5 hours, the plastic parts should be free of cracks. The water level change of each gear is less than 15mm


Test

High and low temperature test chamber


Digital frequency meter
pressure gauge



Nozzle strength

Apply a tensile force of 50N on the air nozzle of the pressure sensor, upright, left and right directions respectively, and there will be no rupture or deformation after 5S 

Test

Tension gauge 

High pressure

Slowly pressurize from 0 to 15kPa at a pressure change rate of no more than 500Pa/S. After a 1-minute test, the pressure sensor should not leak 

Test


Air tightness tester

Water resistance

After immersing the pressure sensor in a water tank with a water level of 10cm±1cm and a water temperature of 20℃±10℃ for 8 hours, the insulation resistance should be greater than 5MΩ after drying the water droplets.

Test

Water tank

Insulation Resistance Tester

Salty spray

Place the working sensor in the salt spray box. After 48 hours, the metal parts must not be corroded, and the water level change of each gear is less than 15mm


Test

Salt spray test chamber


Digital frequency meter
pressure gauge 


 Humidity

After placing the pressure sensor at a temperature of 40℃±2℃ and a relative humidity of 95% for 168 hours, the insulation resistance measured directly in the test chamber should be greater than 2MΩ. After 30 minutes, the water level change of each gear should be less than 15mm.

Test

Constant temperature and humidity test chamber


Digital frequency meter
pressure gauge
Insulation Resistance Tester 


Drop

Drop the pressure sensor from a height of 30cm in any direction on a wooden board with a thickness of 20mm or more, a total of 3 times, the water level change of each gear is less than 15mm 

Test

/

Durability

After acting 50,000 times at a speed of 20 times/min under rated voltage, the water level change of each gear is less than 15mm 

Test

Test deck

Hazardous substance compliance

For products that need to comply with hazardous substance restrictions, any parts on the product must meet the requirements 


Test


Fluorescence analyzer 

 Pulling force (applicable to pulsator )

Pull-off force of connecting pressure pipe and pressure sensor nozzle ≥60N

Test


Tension gauge

  

     

 

 

 

 Installation and Inspection

The air nozzle is placed downward (as shown in below picture), and the action water level of each gear meets the technical requirements.

Appearance and frequency/water level  







Frequency and water level correspondence

 

 

 

      

 

frequency kHz 

water level mm

initial

26.80±0.3

0

reset

25.31

149±15

water level 1

24.89

190±13

water level 2

24.47

232±10

water level 3

24.02

282±10

water level 4

23.45

340±7

water level 5 CTQ

23.01

390±7

high water level

22.50

460±15







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