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BF-DKT4 Adjustable water-level controller

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Functions overview

BF-DKT4 can be widely used in various applications requiring water level control, such as water level display and control of roof-mounted water tanks in hotels and dormitory buildings, and water level display and control of water towers.

The controller, equipped with BESFUL AT35-7-U6 water level sensor for water tank level measurement, can be used to control the water feeding operation for water tanks by setting up 4 water levels. It allows users not only to define the full water level and refilling water level according to their individual needs to control water feeding in case of water-shortage, but also to start output manually at any time, while providing protection against dry heating in case of water-shortage.

The current water level is visualized by 3-digit digital water content percentage display and five-segment water column.

Thanks to the wide range of rated power supply, the controller is able to ensure stable, reliable and durable operation by adapting to AC80V240V power supply.


Installation and Features


Main Features

  • One-set AT35-7-U6 water level sensor input

  • Once-channel NO contact water feeding control output, two-channel ant-dry heating contact output

  • Water level display

  • Auto water feeding

  • Manual water feeding

  • Adjustable refilling water level

  • Adjustable full water leve

  • Protect against dry heating in case of water-shortage

  • Memory protection after power failure

Specifications and Technical Data

Packing List of Product

1. Main unit

2. 1 x AT35-7-U6 water level sensing wire kit (7 wires)

3. Waterproof cover for water level pinboard

4. M40 water level pinboard

5. User instructions

6. Mounting bracket

Overall Dimensions (mm)

L 91 × W 40 × H 52

Installation and Dimensions (mm)

The controller can be installed on a standard DIN guide rail or permanently mounted with two fixing holes (hole pitch = 84 mm).


Net weight: 0.357 Kg  

Gross weight: 0.517 Kg

Power Supply and Consumption Power

AC (80240)V, 2W

Operating Conditions

-10℃ ~ 50℃

Display Mode

LED digital display


Push-type membrane keys


One-set AT35-7 water level sensing wire input, measuring range: 0%, 30%, 50%, 80%, 100%


1. One-channel relay NO contact output (controlling water feeding solenoid valve), two-channel relay NO contact output (controlling anti-dry heating in case of water-shortage).

2. Current capacity of each channel contact: 5 A (resistive load) and 1 A (inductive load)

Able to control a 1000W electric heater or a 200W motor or water pump. AC contactor required for capacity expansion in case of larger load.

Measurement Range

0%, 30%, 50%, 80%, 100%

Setting Range

Setting range of full water level: 30%, 50%, 80%, 100%

Setting range of refilling water level: 0%, 30%, 50%, 80%

Control Range

Water-shortage, 30%, 50%, 80%, 100%

Other Parameters

1. The signal wire of water level sensor can be extended by 100 m with ordinary wire for long-distance connection.

2. Memorize the set parameter for a long time after power failure

Power Supply and Input & Output Ports

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