Ultimate ATO
Ultimate ATO
Model: UATO-400P
Ultimate in Protection, Ultimate in Precision & Ultimate in Versatility


  • World’s first 4-sensor ATO
    • One sensor for top-off detection
    • Two sensors dual-stage overfill alarm w/ QST Programming
    • One sensor for run-dry protection (also a first)
  • Versatile installation with accessories included
    • Efficient DC Pump – Standard
    • Socket switch for use with AC pumps (up to 10A)
    • Solenoid valve for use with RO/DI systems
  • Super precise water level control
  • Super easy installation; plug-and-play
  • No programming or adjustments required
  • Works in complete darkness

Why Choose Ultimate ATO ?

With 2 X dual-optical sensors, the Ultimate ATO is the first ATO to include 4 sensors. The 4 sensors allow us to design a dual-stage overfill alarm that is less intrusive as well as a run-dry protection feature that prevents your sump from running dry: which is also a first.

The Ultimate ATO’s versatility is also unmatched. An efficient DC pump is included for a standard installation. If you require a larger ATO pump for a remote sump installation, a Socket Switch is included that allows you to run a pump up to 10A (1000W). A solenoid valve is also included for aquariums that are topped off directly with an RO/DI system.

We designed the Ultimate ATO to offer you the ultimate protection with the ultimate convenience!


Installation Diagram:

Figure 1. Installation w/ Sensor Housing (Standard Installation)
Figure 2. Installation w/o Sensor Housing (Optional Installation)
Figure 3. AC Switch Installation(Using with AC pumps)
Figure 4. Solenoid Valve Installation Option 1: RO/DI System w/o Auto Shut Off
Figure 5. Solenoid Valve Installation Option 2: RO/DI System w/ Auto Shut Off
*Please avoid setting up the sensor in an area with micro bubbles or direct light.

Additional Images: