Product Spotlight: VMUS-4

VMUS-4 Ozone Generator

With the VMUS-4 Corona Cell recently being added to our website, it is a great time to take a look at the specs and features of the VMUS-4 Ozone Generator.

The VMUS-4 is an ozone generator can produce ozone from dry air, or oxygen feed gas.  Either vacuum operation or pressure works fine for the ozone generator cell.  Air cooled operation allows for use in a multitude of applications without the dilemma of cooling water.  With the smaller size and secure ozone production, the VMUS-4 is a great value in ozone generators! The VMUS-4 is a wall mountable Ozone generator which produces up to 10 g/hr of ozone @ 4 l/min of oxygen at over 3% by weight. Higher ozone concentrations are possible at lower oxygen flow rates. At 1 LPM the VMUS-4 produces ozone at 5.3% by weight. For full details on ozone generator performance view our performance chart. This generator uses corona discharge technology. The corona cell in the VMUS-4 uses a true quartz dielectric in a stainless-steel shell. This technology offers maximum reliability and ability for future repairs if ever necessary. Every component on the VMUS-4 is replaceable or repairable for long-term operation in your facility. 

Key Features:

  • Produces Up to 10 g/hr ozone efficiently
  • Capable of also producing 4 g/hr ozone from dry air
  • Wall mountable
  • Flow meter is standard
  • Adjustable output Standard
  • Flow Switch Standard
  • Detachable power cord
  • Easy to install and operate
  • Powder coated Al. cabinet
  • Can operate under pressure or vacuum
  • Circuit protection equipped
  • Rebuildable ozone generator corona cell
  • 120 or 220 VAC power, 50/60 Hz capability standard

Different Options

4-20 mA input control – control output of ozone generator from 0-100% via a 4-20 mA input.  Additional information on this in the adjustable ozone output section below.

External ON/OFF control – turn ozone generator ON/OFF via dry contacts from remote location.  Useful for system integration where some automation is required.

Internal air pump – small air-pump can be built into the VMUS-4 to push air through the ozone generator.  This is useful when the VMUS-4 is used with an air dryer to produce ozone and a motive flow source is required.  Such as, a bubble diffuser at the bottom of a water tank.

Disable Flow Switch – option to disable the integrated flow switch.  Useful for low-flow applications, where ozone production at flows below 1 LPM are required.

Integrated Flow switch

The VMUS-4 uses an integrated flow switch for simple and reliable automation. This switch will turn the ozone generator ON when feed-gas flow rises above about 1.5 LPM, and turn the ozone generator OFF when feed-gas flow drops below about 1 LPM. This provides some simple automation for your ozone system. When used with a simple venturi injector the VMUS-4 will turn ON and OFF automatically based on suction from the venturi. When used with an oxygen generator the VMUS-4 will turn ON and OFF automatically when flow starts or stops from the oxygen generator. This feature eliminates the need for external wiring or flow/pressure switches.

When the ozone generator is turned OFF due to no flow, the No Flow light illuminates indicating this. When the flow is present this No Flow light will go out, and the blue Ozone light will illuminate, indicating ozone is now produced. This flow switch can be disabled by choosing the “Disable flow-switch” option when purchasing.  There is no cost difference on this option.

Adjustable Ozone Output

The VMUS-4 uses a digital adjustable ozone output shown in the image above. This will allow setting the ozone output from 0-100% using the rocker switch. Green status lights will show the current power setting of the ozone generator clearly and easily. The ozone output can also be adjusted while the ozone generator is in a No Flow status and not producing ozone.

Ozone output can also be adjusted via 4-20 mA input.  This allows adjustment of ozone output via a PLC or another device for automated operation.  When this option is chosen the keypad is overridden as long as the 4-20 mA is connected, if the connection is terminated the keypad is functional again.  Ozone output is displayed via the green LED indicators on the touchpad with the 4-20 mA input or the pushbuttons.

Circuit Protection

The VMUS-4 uses a sophisticated power inverter board that will protect the corona cell and/or transformer against failure. In the event, the corona cell does become contaminated with moisture, or dust the inverter will turn OFF ozone production immediately to protect against damage. Every 6 seconds this inverter will attempt to produce ozone and will restart automatically when conditions improve. While we hope our customers never flood, or contaminated the ozone generator corona cell, we know this is a possibility, this circuit protection will prevent potentially costly repairs.

Rebuild-able Corona Cell

The VMUS-4 corona cell is completely rebuildable. The Quarts dielectric can be removed from the stainless-steel shell and be cleaned, or replaced if necessary. We know that air dryers, oxygen concentrators, and check valves can fail. Therefore, we provide an easily rebuild-able corona cell so that these external failures do not have to be fatal to your ozone generator. The VMUS-4 Corona cell consists of very few components. The Stainless shell and quartz dielectric are the main components.  Each end is sealed with a Kynar end cap that has the fitting molded in (fewer leak points) with a Viton O-ring and Kynar sealing ring.  We stock and sell all replacement and repair parts for the VMUS-4 ozone generator.  Therefore, you can be confident that no matter what happens your ozone generator will be repairable.

Updated VMUS-4 Ozone Generator

The VMUS-4 Ozone Generator has been in production for well over 15 years now.  There have been updates to the VMUS-4 during that time, however, the updates that occurred in 2017 have been the most drastic and best improvements yet. 

As a recap, the VMUS-4 is a versatile ozone generator that can produce ozone efficiently from either oxygen or dry air while operating under a pressure or vacuum.  The VMUS-4 produces 10 g/hr ozone from oxygen or 4 g/hr ozone from dry air.  This is an ozone generator that can be implemented in a wide variety of ozone applications.

VMUS-4 OZone Generator
VMUS-4 Ozone Generator

The enclosure and basic function of the VMUS-4 has remained mostly unchanged since it’s inception.  However, in 2014 a revised transformer and inverter board were implemented, along with an improved 10-position switch and integrated flow-switch.  In 2017 even more, changes have taken place, below is a summary of updates and changes.

2014 updates:

  • Original oil-filled transformer replaced with open-coil style transformer for greater reliability
  • Driver board was replaced, new board has the transformer and flow-switch integrated on the board for a smaller design.  Greater number of transistors are used for greater reliability
  • 10-position switch become rocker switch style and was standard on all units, prior to this it was a knob and was an option
  • Flow-switch is not standard, and much more sensitive and reliable.

2017 updates:

  • Same transformer, and flow wich used on the driver board, however, updates to the driver board have been made to allow the unit to operate on 120 or 220 VAC power without making any changes to the unit.  There is now no cost to a 220 VAC unit.
  • The enclosure has changed for the first time, the enclosure is now slimmer than before.  While height and width have stayed the same, the enclosure is not as deep.
  • 10-position switch has again changed to a button style that is easy to change
  • ON/OFF switch is now a simple one-touch button
  • Lights on user interface are now LED
  • Cooling fans have changed from AC fans to DC operated fans, they are smaller and offer more airflow and more coverage of the corona cell for improved cooling

In summary, the VMUS-4 ozone generator is better than ever with the same great reliability (even better) and versatility our customers demand.

We have recently tested the updated VMUS-4 ozone generator performance on oxygen across a wide variety of flow rates, and each potential output setting.  This chart is shown below for your review.

Click on image for larger view

VMUS-4 ozone generator
VMUS-4 Ozone Generator Performance chart on oxygen feed-gas

We provide an ozone generator performance chart with every ozone generator we sell.  It is imperative you know exactly what the performance of your ozone generator should be prior to implementing it into your application.

If you have any questions on what ozone generator may be right for your application, please do not hesitate to call us.  We are more than willing to discuss your specific ozone application and help you find suitable ozone equipment for your needs.

Downloads:

K Series Brochure

VMUS-4 Ozone Generator Manual

VMUS-4 when used with VMD Air Dryer Manual

Ozone Generator Performance Defined

Every ozone generator is rated using certain metrics.  These are illustrated in a performance chart that should be available with every ozone generator.  Here is some important information about ozone generator performance, and how interpret this information.

Example of ozone generator performance chart
Example of ozone generator performance chart

An ozone generator performance chart may show various data in relationship to ozone production or concentration. Below are some definitions of this data and what you might look for.

Ozone Production:

Ozone production is commonly shown in g/hr, but also may be shown in mg/hr, lb/day or another unit of measure. The ozone production value must be shown in a mass over time value that indicates mass of ozone produced in a given period of time. This value is a calculated value based on ozone concentration and feed-gas flow rate.

Online ozone output calculator HERE

Ozone Concentration:

Ozone concentration is a measurement that shows the ratio of ozone to feed-gas produced from the ozone generator. This is real-time measurement that is obtained via a high concentration UV Ozone Analyzer. Ozone concentration may be shown in % by weight, g/m3, or another unit of measure that illustrates a mass of ozone at a given moment.

Feed-gas:

The ozone generator feed-gas may be oxygen, or air. This information must be present to determine what gas was used, and what gas must be used to achieve the same results. Oxygen purity, or air dew-point values would be helpful information.

Flow-rate:

The flow-rate of gas must be given to show the required flow-rate to achieve the reported ozone concentration and calculated production. Ensure that measured flow is compensated for pressure as manual float type flowmeters readings need to be calculated for pressure. We have found some performance charts that were created using direct readings from manual flow meters without calculating for pressure, this gives a false low flow-rate, false high ozone concentration, and false high ozone production rate.

Feed-gas Pressure:

Feed-gas pressure would indicate the pressure of fed-gas on the ozone generator corona cell. Some ozone generators ozone production will rise or fall as gas pressure on the corona cell changes. Therefore you might see a performance chart show the relationship between ozone production and pressure.

Power Setting:

The power setting of the ozone generator could be shown to illustrate how ozone production varies with changes in the adjustable ozone output dial or remote signal. This could be shown in a % or specific indication of the dial.

Power Consumption:

Power consumption could be shown in relationship to ozone production to show the net result or change of power consumption based on the power setting value on the ozone production. This would illustrate energy consumed by the ozone generator for a specific ozone production rate. This information could be used to determine electrical efficiency of the ozone generator.

Additional information links:

White paper: Validation of Gas Flow Measurement During Ozone Generator Performance Testing

White Paper: Guideline for Measurement of Ozone Concentration in the Process Gas From an Ozone Generator

Importance of ozone generator performance charts

Ozone Generator Performance Chart Defined

Ozone generator performance must be measured and tested to quantify the production of ozone. For most applications ozone production is the number one factor in choosing an ozone generator for that application. Therefore, it is imperative a reliable performance chart be reviewed prior to the purchase of any device that may produce ozone.

Image below is given as an example of an ozone generator performance chart.

Understanding ozone generator performance chart
An ozone generator performance chart may show various data in relationship to ozone production or concentration. Below are some definitions of this data and what you might look for.

 

Ozone Production:

Ozone production is commonly shown in g/hr, but also may be shown in mg/hr, lb/day or another unit of measure. The ozone production value must be shown in a mass over time value that indicates mass of ozone produced in a given period of time. This value is a calculated value based on ozone concentration and feed-gas flow rate.

 

Ozone Concentration:

Ozone ozone concentration is a measurement that shows the ratio of ozone to feed-gas produced from the ozone generator. This is real-time measurement that is obtained via a high concentration UV Ozone Analyzer. Ozone concentration may be shown in % by weight, g/m3, or another unit of measure that illustrates a mass of ozone at a given moment.

 

Feed-gas:

The ozone generator feed-gas may be oxygen, or air. This information must be present to determine what gas was used, and what gas must be used to achieve the same results. Oxygen purity, or air dew-point values would be helpful information.

 

Flow-rate:

The flow-rate of gas must be given to show the required flow-rate to achieve the reported ozone concentration, and calculated production. Ensure that measured flow is compensated for pressure as manual float type flowmeters readings need to be calculated for pressure. We have found some performance charts that were created using direct readings from manual flow meters without calculating for pressure, this gives a false low flow-rate, false high ozone concentration, and false high ozone production rate.

 

Feed-gas Pressure:

Feed-gas pressure would indicate the pressure of fed-gas on the ozone generator corona cell. Some ozone generators ozone production will rise or fall as gas pressure on the corona cell changes. Therefore you might see a performance chart show the relationship between ozone production and pressure.

 

Power Setting:

The power setting of the ozone generator could be shown to illustrate how ozone production varies with changes in the adjustable ozone output dial, or remote signal. This could be shown in a % or specific indication of the dial.

Power Consumption:

Power consumption could be shown in relationship to ozone production to show the net result or change of power consumption based on the power setting value on the ozone production. This would illustrate energy consumed by the ozone generator for a specific ozone production rate. This information could be used to determine electrical efficiency of the ozone generator.

 

More Info: