Tunze

Tunze Osmolator Universal 3155 Auto Top Off ATO

$199.99  

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The TUNZE Osmolator 3155 is an automatic top off (ATO) system for marine and reef aquariums. The Osmolator – short for Osmotic Regulator – automatically adds freshwater to compensate for evaporation in your saltwater aquarium.

The high-tech German designed Osmolator uses a precision optical sensor to measure the water level. Water continuously evaporates from the aquarium, leaving the salts behind. This causes the salinity to increase. When you manually pour in water the salinity is suddenly decreased. This “salinity rollercoaster” stresses the fish and invertebrates by causing extreme fluctuations in osmotic pressure.

The Osmolator puts an end to this by continuously sensing the rate of evaporation (water level) and adding back the right amount of freshwater. This brings osmotic stability to the aquarium and keeps your sump and aquarium water at the right level.

Here’s what we really like about the Osmolator:

  • TUNZE invented the ATO and has been perfecting it for 30 years
  • Precision optical water sensor detects the slightest change in water level
  • Easy to install and adjust using the Magnetic Sensor Mount
  • Status lights display functions and sounds a warning in case of trouble
  • Built-in safety features prevent overfilling of the aquarium and shuts the system down
  • Comes ready to install – all you need is a reservoir or bucket

The Osmolator can be used on any aquarium, even freshwater tanks. It works when installed inside the aquarium on tanks without a sump. If you have a sump the sensor must be installed there since that is where the water level changes as it evaporates.

Features:

  • Complete kit with power supply, metering pump, hose and sensor mounting system.
  • The water level sensor has no moving parts to wear out and is not affected by suspended dirt, light or magnetic fields.
  • Optical sensor ignores gentle water movements caused by wave makers and circulation pumps.
  • An independent safety sensor with a separate power supply circuit and relay ensures reliable overflow protection.
  • A microprocessor monitors the water level in the reservoir and prevents the pump from running dry.
  • All functions are clearly displayed by colored LEDs and warning signals.
  • The Osmolator uses ultra-low voltage for complete safety.

For smaller aquariums, check out the Tunze Nano Osmolator 3152. If you need a container to hold your top off water, the Tunze Osmolator Storage Container 5002.25 is an ideal choice.

Specifications:

  • Metering pump flow rate based on pumping height: 3 feet:13.7gph, 5 feet:12.4gph, 6.5 feet: 7gph, Maximum pumping height: 7.22 feet
  • Magnetic Mount System: Maximum glass thickness ½ inch
  • For indoor use only
  • 2-year warranty

Product Manuals & Documentation

Tunze Osmolator Universal 3155 Auto Top Off ATO

Owner's Manual available for download in Adobe PDF file format

Manufacturer Info

Tunze
For forty-five years the name TUNZE® has been synonymous with aquariums. Many products and components which we have developed in the course of time are now standard features of aquarium technology today. This confidence in TUNZE is no coincidence. The company has remained true to its philosophy right from the beginning, researching water biotopes all over the world to develop components which enable natural water conditions in the closed environment of an aquarium. In the implementation of know-how, effectiveness and efficiency, TUNZE® takes the lead in environmental compatibility. Their motto is: quality and reliability. These values are upheld with well thought-out and precise tool making by highly qualified experts. The brand names of TUNZE® and Turbelle® meet the expectations of the seal of quality; Made in Germany. Many of the products shown in this catalogue are protected by national and international patents.


Warranty

Manufacturer`s Warranty: 2 years from date of purchase.

Ask a Question Earn 15 Points when you answer a question
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9 Questions
Displaying questions 1-9
 
Q
What are the dimensions of the magnetic sensor holder?
Asked : Mar 10, 2019
By : Francisco
 
 
 
Q
I have the tunze 5017 ATO the control board went in my sump . Can I get just the control box if so how much?
Asked : Feb 17, 2018
By : Phil Corless, Abbotsford bc
 
 
 
 
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Overall, others give this:

  • 4.5

128 Reviewers (94%) would recommend this

Overall Rating:

download image
5  Star
 92
4  Star
 24
3  Star
 6
2  Star
 2
1  Star
 4
 
5
5.0
Life is Easier
reviewerbadge
PROS
Easy assembly
CONS
None so far
REVIEW
This product has made my life so much easier. I was manually topping off my water each day. Now, with the Tunze ato system It's one less thing to worry about.
  • 1
Was this review helpful: Yes(0)No(0)
 
 
 
4
4.0
The tunze 3155
reviewerbadge
PROS
Very quite and accurate
CONS
None so far
REVIEW
My osmolater seen to be working fine hook for 4 days so far so good. Easy to assembly as well
  • 1
Was this review helpful: Yes(0)No(0)
 
 
 
5
5.0
Best ATO on the market
reviewerbadge
PROS
Very reliable,
CONS
None
REVIEW
I don’t understand how anyone could live without this, I highly recommend to everyone though to slow the rate by adjusting the knob inside the water level controller
  • 1
Was this review helpful: Yes(0)No(0)
 
 
 
4
4.0
Works perfectly so far!
reviewerbadge
PROS
Optical with manual backup (peace of mind).
CONS
Noisy pump.
REVIEW
I'm new to the reef community and I read that Tunze is one of the best so I went with this ATO. It's great so far. I love the optical sensor with the manual backup for peace of mind not to overflow my tank. The water level meter is also very cool. The only thing I dislike is how loud the pump is.
  • 1
Was this review helpful: Yes(0)No(0)
 
 
 
5
5.0
Great ato
reviewerbadge
PROS
Reliable and great quality
CONS
A little on the expensive side and needs to really be turned since the pump is powerful
REVIEW
Never had a problem besides one breaking. I did buy it used so who knows how long that was really used for. Otherwise my current one has been running for a year and work great.
  • 1
Was this review helpful: Yes(0)No(0)
 
 
 
5
5.0
Great ATO

reviewerbadge
REVIEW
I've been using this ATO for some time now and it hasn't give me a single problem. it works like the first day.
  • 1
Was this review helpful: Yes(0)No(0)
 
 
 
5
5.0
Highly Recommend
reviewerbadge
PROS
Redundancy, Reliability, Adjustability
CONS
Pump Runs When First Plugged In
REVIEW
If you are considering it, just buy it. You won't be disappointed. The only complaint I have is that it runs pump for about 10-30 seconds when you plug it in so when you do maintenance, you either have to disconnect one wire to the pump, or plan for that extra freshwater being added. I love that I c...Read More
  • 1
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Sort by:
 

Overall, others give this:

  • 4.5

128 Reviewers (94%) would recommend this

Overall Rating:

download image
5  Star
 92
4  Star
 24
3  Star
 6
2  Star
 2
1  Star
 4
 

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