hygger Aquarium Alarm Auto Top Off Kit with Two Pairs of Protection Sensors

• Small and compact design
• Sound alarm
• Auto refill and one-key drain water
• Led indicators alarm
• Easy to install and use



SAFETY: Light Flashs and Beeping Alarm

Connect the water pump cord Working State: Constant brightness when refilling water; Off when standby.
Display Abnormal: Beep and Blue light flashing
Stop Working: 1.The refill water pump in the reserve water tank is out of water; 2.The refilling pump’s electric wire loose; 3.The water pump is working abnormally.
Trouble Shooting: 1.Place the pump into the water then press the M button; 2.Plug the water pump into the monitor Blue light hole tightly; 3.Change the pump.
Connect the external optical
sensor cord
Working State: Green Light Off
Display Abnormal: Beep and Green light flashing
Stop Working: 1.Water shortage in reserve water tank; 2. External sensor’s electric wire loose; 3.The external sensor is working abnormally.
Trouble shooting: 1.Refill water into the reserve water tank, make sure the reserve water is higher than external sensor; 2.Plug the sensor into the monitor Green light hole tightly;
Connect the power adapter
Working State: Red Constant brightness
Display Abnormal: RED Light OFF
Trouble Shooting: 1.Make sure the power adaptor is plugged into the monitor Red light hole tightly; 2.Confirm that the power supply.
1. Display Abnormal: All lights flashing and Beep
2. Stop Working: 1. Calibration is not stable; 2. The water level in the tank is higher than the ATO.
3. Trouble Shooting: 1. Remove the external monitor and set it down horizontally. Let it re-calibrate precisely; 2. Wipe the monitor and the fish tank wall.
Connect the water pump
Working State: Constant brightness when draining water, Off when standby.
Display Abnormal: Beep and Yellow light flashing
Stop Working: 1. The fish tank where has drain pump is out of water; 2. The water pump’s electric wire loose; 3. The water pump is working abnormally.
Trouble shooting: 1. Place the pump into the water then press the M button; 2. Plug the drain water pump into the monitor Yellow light hole tightly; 3. Change the pump.


In order to make the product monitoring more accurate and avoid errors, please clean the fish tank wall where the monitor is placed and the two sides where the monitor is fixed on the fish tank wall during the first use. And it is recommended to clean regularly.Put the monitor into the tank and outside the tank respectively, move them horizontally until they are overlapped, and never overlap the inner and outer parts directly. Because the magnetic force in hygger product is very strong.Make sure that there are no obvious bubbles in the fish tank water near where the monitor is placed.
It will affect the judgment of the sensor and cause incorrect or non-refilling of water.
• When the water level line is near A (the first monitoring probe), the product will automatically refill water;
• When the water level reaches B (the second monitoring probe), the automatic refill will be suspended;
• Our product uses an ultra-wide prism, and point C will always be kept clean. When the point below B is covered with impurities for a long time, the monitoring fails and overflows, but C is not affected, and an alarm will sound.


Put the holder on the wall of the fish tank;
Tighten the screws to fix;
Align the clip with the protruding slide, and install the hose clip;Insert the hose;Install the last hose clamp.


If the external sensor is placed in a spare water tank with glass, please slide the installation horizontally. The thickness of the glass wall of the fish tank is recommended to be ≤0.15in.If you are using a bucket and the thickness is very thick, you can put all the external sensors in the bucket instead of placing them separately.The small black button is to prevent water from entering the hole, so please save it when not in use.• DC 12V 5W
• H.max:6.5FT
• Q.max:74 GPH
• Line length:70in

INSTALL CORRECTLY (Place the monitor horizontally)

NO: Three holes face upNO: Put verticallyNO: Put oblique



Model Power Input Voltage Output Voltage H.max Power Cord Flow Rate Max
HG-987 5W 110-120V/60Hz 220-240V/50Hz DC12V 6.5FT(2m) 6FT(1.8m) 74GPH(280L/H)



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Can I get a sample?
Yes, you can pay a little samples charges.

How to install the product?
We will give you an installation guide, and then you can install it by yourself easily.

How soon can I get a price quote?
For most projects, once we know the style and the size, we can provide you with a price quote within 24 hours.

Do you accept customization orders?
Yes, and MOQ 1000pcs.

What should I do before ordering?
Before ordering, we need to confirm the product details and price, and confirm the material you chose, and then you can start to order.

Do you provide design services?
Yes, we provide design services for the aquarium, including aquarium decoration design, aquarium life support system design and pool lighting design.

Can you accept small orders?
Yes, our Hygger brand product MOQ is 5 pcs. If OEM, MOQ 500-1000pcs.

About Payment Methods & Shipping
We will choose the best Payment Method and logistics according to your order. Please feel free to contact distributor@hyggeraquarium.com.


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