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Customer Testimonial
Broetje Farms Testimonial

Guardian Manufacturing customer, First Fruits / Broetje Orchards, is pleased with the overall operation, reliability and precise dosing capaiblities of Guardian's Ensure series of ozone generators. Watch Bob Franklin, Storage Manager for Broetje Orchads discuss, his experiences and overall opinion of Guardian's Ensure ozone systems.

"With organics, we are extremely limited to what we can do in the orchard and also in storage.  Unlike in conventional fruit where we can use fungicides and anti oxidants, we are not allowed to do that with organics. Ozone fits that area very nicely. We get better packouts," states Bob Franklin.

Click here to watch the video testimonial.

Ozone Applied
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Hardware Overview
  • Quiet Operation (23,000 Hz operation).
  • Efficient & Reliable Design Technology
  • Linear Control Turndown 100:1 Manual or PID Plug & Play Oxygen System (option)
  • Oxygen Monitoring Protection
  • UL508A Label - UL Listed Generator
  • PLC HMI or Smart Relay Interface
  • Multi Zone Function Option
  • Rugged Design
  • Guardian's RMT-Remote Monitoring via Internet/Intranet
HMI Ensure Touchscreen.
Produce Varieties Treated
  • Tomatoes
  • Table Grapes

Citrus Fruit

  • Oranges
  • Lemons

Stone Fruit

  • Peaches
  • Fruits & Vegetables

    • Cucumbers
    • Honeydew
    • Onions
    • Peppers
    • Pickles
    • Potatoes
    • Squash
    • Watermelon
    • Zucchini
    • Red Chilis
    • Pineapples
    Ozone for Cold Storage


    Ozone Treatment Benefits
    • Product “Insurance” – maintains superior product quality while decreasing shrink and increasing cold storage hold times
    • Air-borne and surface-borne microbial control
    • Ozone efficiently and economically generated, applied and controlled automatically on-site
    • Continuously treats and sanitizes cold air at point of introduction
    • Automatically maintains ozone setpoints for daytime / night time microbial and ethylene control
    • Rapid return on investment
    • USDA & FDA approved. National Organic Program (NOP) allowed.
    The installed base of Guardian ozone fumigation systems in cold storage facilities provide well documented product quality improvements, in addition to reduced reliance on caustic chemical use such as SO2.

    Guardian Ozone engineered cold storage systems, trade named Ensure-FS™, have been installed and validated in a wide variety of potato, onion, and other fruit & vegetable packing, cold storage, and distribution facilities repeatably demonstrating improved product storage, reduced spoilage and increased shelf life at retail shopping centers.

    Ensure-FS™ Ozone System Features
    • Independent day/night ozone setpoints per room
    • Duty mode / Sensor mode programmable
    • Independent seven day programmable control
    • Reliable and accurate UV Adsorption ozone monitoring
    • 24-hour ozone data logging to share with customers
    • Interlock control for ozone on/off production

    System Overview In-Depth

    Multiple Zones from One Machine
    Our system architecture has the capacity to deliver independent room dosing setpoints for 1-16 rooms. Each room is capable of day and night setpoints along with a 7 day independent operation mode for setting levels differently when employees are not present.

    Remote Monitoring Technology:
    Ensure-FS™ systems feature a touch Panel for accessing alarming features. A built-in Web Server displays static ozone levels. Alarm notification through e-mail/text message is available when the system is ordered with PLC and the Remote RMT package. With this optional feature installed, web based monitoring & control, alarming, and the ability to access historical process parameters. Click here to visit Remote Monitoring Pages.

    No System Warm Up Required
    Unlike older systems which may be running continuously to an ozone destruct unit, the Guardian design can startup and shut down instantly. With the oxygen system in standby mode, the generators are always ready to perform at peak efficiencies. All high voltage is safely contained completely within the Plasma Block® . This eliminates shock hazards and dirt build up which can cause dangerous flash over.

    Instant Ozone When Needed

    Due to the Micro Channel™ design of the Plasma Block®, generator, high concentration ozone is always ready to operate at peak performance. Should the system require 100% ozone, Guardian's architecture will start the Plasma Block® generator (on demand) and shut down the system when needed.


    Variable Ozone Output Option

    Should there be a requirement for varying the ozone output, Guardian's design can allow for a linear turn down to 1%. This is very unique in the industry and allows the operator to keep a very precise control on the systems organic loading requirements.


    No Glass Tubes

    Glass tubes in older systems require special handling and care and are expensive to replace. Operating at high voltages and lower frequency they require a specific warm up period and tend to be somewhat temperamental. Ask users of this older ozone generating technology about the maintenance aspect(s) of tube replacement and upkeep.


    No Wet Air Problems

    Wet air is a problem with any ozone generating system. To insure Guardian's Plasma Block® design is always ready to perform at full potential, only oxygen supply systems are incorporated into our Ensuredesign. Because of this, the dry oxygen feed gas enters the plasma chamber and eliminates the potential for creating nitric acid build-up in the cell.


    Easy Maintenance & Low Cost

    The Plasma Block® cells are maintenance free. Guardian's design allows for easy access to the hardware for immediate replacement of all components. Items are stocked and readily available. Should the Plasma Block® cells need replacement or refurbishment, they are easily removed in a matter of minutes. With Guardian's oxygen feed system, replacement of the ozone generator should not be a requirement. Cells can easily last for 10 years.


    Huge Energy Savings

    Micro Channel™ design results in high concentration ozone at 23,000 Hz/3200 volts. Precision machined aluminum block eliminates inefficient hot spots. Only a 2 psi drop with 10 LPM flow. Maximum cell pressure is over 100 PSI. As with any cell the most predictable performance occurs with positive pressure domain. Running at full load the cell only uses 250 watts for an air cooled unit. A Guardian system with two Plasma Block® cells and oxygen system will use about the same power as a microwave oven. ( ~ 1500 watts @ 120 volts) This should produce over 3 pounds or 1365 grams of ozone per day making it the most efficient system on the market. When you calculate the instant on/off feature the energy saving are tremendous. Water cooled cells are also available and supply ozone amounts up to three times more.


    Custom Programming

    Should there be a requirement for data logging, remote access or special features which need to be integrated into your process control; Guardian's engineers are up to the task. We are staffed with highly competent individuals from the aerospace and computer programming industries.


    Integrated to Your Process

    We have the knowledge and understanding to ask the correct questions related to you process. Interlock features to components, alarms, stack lights, text messaging allow for our ozone system to function as one with your equipment. This insures that if a problem should occur, the proper alarms are activated which allow the corrective measures to be taken. Should your requirements include the ability to access the system from anywhere in the world Guardian can accommodate you.