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          產品中心

          Products

          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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