HT309 Water Level Controller (2 Levels) / Electronics Kit

Item ID : 184217105
HT309 Water Level Controller (2 Levels)  / Electronics Kit
Sale Price : RM 23.32
Price includes GST (6%)
Shipping (*Exclude GST) :
Peninsular :RM7Sabah, Labuan:RM10Sarawak:RM9
Option :
Ship To : Within Malaysia, ship by Courier Services, Self Collect
Item at : Johor Bahru / Johor
Views : 1907

HT309 Water Level Controller (2 Levels)  / Electronics Kit


The HT309 is a Water Level Controller with Relay Output which using a copper wire as a sensor to monitor the water level in a tank.  It comes with 2 Levels of LED Indicator which are: 

LED1 (Red Color) : Low Level 

LED2 (Green Color) : High Level



  • Input Voltage: 9V-12VDC
  • 2 Levels Controller (Low and High Level)
  • Reverse Polarity Protection
  • LED Indicator for Relay On
  • With Relay Output 


Assembly Instructions

  • Check off the components in the package against the component listing before assembly.
  • Start with the smallest components working up to the taller components, soldering any interconnection wires last.
  • Place and Solder the components into the board, make sure the components are in right position according to the overlay of PCB
  • Use the copper wire for Sensor 1 (High Level) and Sensor 2 (Low Level) connection, length of Sensor 1 must be shorter than Sensor 2.
  • Connect the pump or valve (purchase separately) to the com (common) and NC (normally closed) contact of Relay .


Test & Adjustment

  • After assembled, please check & ensure the value & polarity for all components were inserted into PCB correctly, wrong polarity connection of capacitors can caused explosion of failure.
  • Next, ensure all these leads are soldered, no solder bridges between adjacent pads and no dry joint.
  • Once confirmed, connect the power source to the circuit board.
  • If all goes well, this kit starts function as following:
  • Pressed a test/manual switch (SW1) to test the circuit without having to trigger the sensors. It also provides a convenient method to manually run the pump, which will run as long as (SW1) is depressed and turn off immediately when (SW1) is released.
  • When the water tank is empty (Low Level Detected), LED 1 (Red) lights up and turn on the water pump or valve.
  • When the water rises to Sensor 1 (Low Level Detected), LED 1 and water pump or valve are stay on.
  • When the water rises to Sensor 2 (High Level Detected), LED 1 goes off while LED 2 (Green) lights up and Relay will be energized to turn off the water pump or valve.
  • The water level will begin to drop if the water is pumped out.
  • When the water falls below Sensor 2 (Low Level Detected), LED 1 lights up & LED 2 stays on and keeps the water pump or valves off.
  • When the water falls below Sensor 1 (Low Level Detected), LED 1 stays on & LED 2 goes off and Relay will be de-energized to turn on the water pump or valve.
  • Repeat the cycle until user turned it off.  



  • Package includes schematic, printed circuit board and components except the pump or valve.
  • You need to have a soldering skill and basic knowledge of testing
  • For any inquiry or other technical problem, please contact us through or 07-3344473


Last Updated @ 11/30/2015 1:09:33 PM

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Q&A (6) - View All
bahing ask: (2016/4/11 07:28)  
hi admin how many day take time for delivery?
hitectrons reply: (2016/4/11 12:31)  
Hi, its depend on where you stay, usually it takes 1-2 working days.
bahing ask: (2016/4/11 07:26)  
Hi. How long take time for delevary?
hitectrons reply: (2016/4/11 12:31)  
Hi, its depend on where you stay, usually it takes 1-2 working days.
azijoe ask: (2015/8/4 11:15)  
Bos.. Sensor boleh detect minyak x. Tq
hitectrons reply: (2015/8/4 15:31)  
Hi, sorry, no.
akumpunlah ask: (2014/3/13 21:24)  
yes.water low = on relay, water high = off relay
hitectrons reply: (2014/3/14 15:20)  
In that case, you can use this kitset without any changes since the water pump is connected to NC of Relay in order to pump the water into tank, when the water reached high level detector, Relay will be energized to turn off the pump. When the water dropped to low level detector, relay will be de-energized and pump the water into tank again.
akumpunlah ask: (2014/3/13 12:49) control water pump.
hitectrons reply: (2014/3/13 13:10)  
Kindly advice whether your application is same as below:
1. When water is low, Water Pump will be activated.
2. When water is high, Water pump deactivated.
akumpunlah ask: (2014/3/13 00:49)  
hello seller, boleh ubah fungsi relay? high water = relay off, low water = relay on
hitectrons reply: (2014/3/13 09:22)  
What is your application? Use the relay to control water pump?
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HT309 Water Level Controller (2 Levels) / Electronics Kit
RM 23.32 Shipping fee (*Exclude GST):Peninsular: RM 7, Sabah/Labuan: RM 10, Sarawak: RM 9,
International: RM
Combine Shipping allowed

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