How To Use Your Ethylene Generator

Ethylene Generator Operating Instructions

We consistently hear from our customers about how safe and easy-to-use our products are, but that’s not to say there aren’t a few questions, too. Check out our operating instructions and tutorials for setting up and using your new generator from Catalytic Generators, LLC.

Easy-Ripe-2019 Easy-Ripe® Generator, 120V Model 
— English
— Spanish / Español
New Easy-Ripe NEW Easy-Ripe® Generator, 230V Model   |  Model with 8 Ethylene Conversion Settings:
— English
Arabic / العربية
Dutch / Nederlands
French / Français
German / Deutsch
Spanish / Español
New Easy-Ripe Side Model with 4 Ethylene Conversion Settings:
— English – 4 Position Ethylene Output
— Arabic / العربية
Dutch / Nederlands
French / Français
German / Deutsch
Spanish / Español
citrus-2016 CITRUS Generator, 120V Model
— English

CITRUS Generator, 230V Model
— English

Auto-Ripe Auto-Ripe® Generator, 120V Model:

Auto-Ripe® Generator, 230V Model:

Sure-Ripe web2
Sure-Ripe® Generator, 120 & 230V Models:

Tobacco Curing Generators

We have a special page for that!

Below are some questions we have received about the proper setup and use of our ethylene generators. If you have a question that we can help with, please contact us.

How is the generator so effective at creating ethylene and helping to ripen fruit uniformly?
Our process of ethylene production is controlled by a mini-computer inside of each ethylene generator.  It is intelligently engineered to regulate the conversion of Ethy-Gen® II and allows calculated and small amounts to enter the heated catalyst chamber.  This precise control permits the ethylene generator to continuously emit ethylene…the “trickle” method as the ripening industry refers to it, for better, uniform fruit ripening.  The result is a machine that is reliable, robust and safe while creating enough ethylene to ripen tons of fruit.

What ethylene generator setting should I use?
This entirely depends on four factors:

  • the parts per million level required (100-150 for most fruits, less than 10 for citrus degreening)
  • the size of the room
  • how “airtight” the room is
  • the number of air exchanges per time period.

Refer to the conversion setting details in the operating instructions above for the specific generator that you are using.

We have found our conversion settings to be applicable for most rooms and provide sufficient ethylene (150 – 300 ppm) to initiate the ripening process in bananas, tomatoes and other fruits (except citrus, which requires less than 10 ppm; for this, use our Citrus Generator). However, some ripeners prefer to take ethylene readings with an Air Sampling Kit and select the setting that produces the ethylene level desired. As always, please contact us if we can be of service.

Also please note that our conversion settings are based on two liters in the reservoir. The first liter will be converted slightly faster than the second one. So if you are using setting #3 and pouring in just one liter, usually this will take slightly longer than 24 hours. However, if you are using setting #4 and pouring in two liters, the first liter will be used in slightly less than 12 hours and the second one in slightly more, and the total time to convert the two liters (on setting #4) will be approximately 24 hours.

Note that for rooms larger than 12,000 ft3 (340 m3), additional generators can be used, if needed, to achieve the proper ethylene level. It may be possible to use just one generator for a room that is larger than 12,000 ft3; it depends upon how tight the room is. We have some customers that are able to use just one generator in rooms that are larger than 20,000 ft3 (566 m3) and achieve 150 ppm of ethylene.

It is perfectly fine to use just one liter in the generator.  Many customers with a one-load banana room will use setting #3 and pour in just one quart.

Questions on how to use our equipment to cure tobacco?
Click here!

Can I use more than 150 ppm of ethylene to speed up the ripening?
It serves no purpose because the additional ethylene has no effect. Any ethylene exposure over 150 ppm does not hurt the fruit* but the extra ethylene provides no benefit. Once the proper ethylene level is attained, the only thing that will speed up the ripening process is a higher temperature. Sometimes fruit that has been ripened at too high of a pulp temperature is referred to as “overgassed.” Often the cause of poor quality associated with this misnomer is not excessive ethylene but extreme pulp temperature at some period in the postharvest life of the fruit, or poor fruit quality, such as old, stale fruit.

Please note that there are reports of bananas responding better to higher ethylene levels. While 100-150 ppm is the proven and accepted standard to initiate ripening and ethylene production in bananas, there are some companies that require their ripening personnel to use 300+ ppm, saying that today’s banana ripens quicker and more uniformly with this higher level. If you are having difficulty with bananas ripening properly, verifying current ethylene levels may resolve ripening issues. There are other factors that are likely the cause of poor ripening, like inadequate humidity and immature fruit; ethylene is not always the culprit. We do not advocate the use of more than 200 ppm; however, as mentioned, more ethylene* does not harm the fruit so we will help you achieve the ppm level that you want!

*Note: Citrus is an exception; it should not be exposed to more than 5 ppm and the precise ppm level required depends upon variety).

Is it OK to turn the ethylene generator off with Ethy-Gen® II Ripening Concentrate still in the reservoir?
Yes, but not for a long period of time. A small amount may evaporate if left in the generator, especially if the lid to the unit is left open. Also, in a very humid environment, water may be absorbed by the Ethy-Gen® II over an extended period of time, which will decrease the effectiveness. So, it is perfectly fine to turn the generator off when the ethylene application is complete and leave Ethy-Gen® II in the reservoir, but it should be used within a week or so.

Is it OK to leave an ethylene generator on with no Ethy-Gen® II in the reservoir?

Does it matter where in the room to place the ethylene generator?
The generator should be placed in an out of traffic area in the room, located in a manner where it will not be damaged by a forklift or pallet jack. It should be in an area that has convenient access and view. Since ethylene is lighter than air, placement directly in the airflow pattern is not necessary, as the ethylene will quickly be dispersed throughout the room by the slightest of air movement. If mounting the generator on the wall is more convenient, we can supply all of our generators with a wall mount plate and generator bracket.

If the light on top of the ethylene generator is green, does that mean that ethylene is being produced?
This light, called the Proper Operation Indicator Light, measures critical production processes of the catalyst chamber. When green, this indicates that conditions in the chamber are perfect for efficient ethylene production. So as long as Ethy-Gen® II is being delivered to the chamber, ethylene will be produced. The only things that will stop production when this light is green is a reservoir that has no Ethy-Gen® II in it, a line that has been disconnected from the CRS generator (on the Centralized Ripening System – CRS®), or other disruption in the flow of Ethy-Gen® II to the catalyst chamber.

What would make the light on top of the ethylene generator turn red, and what do I do when this happens?
When conditions in the catalyst chamber are not perfect for conversion of Ethy-Gen® II into ethylene, the firmware of the generator will turn off power to the chamber and stop the conversion of Ethy-Gen® II. This is designed to only allow for proper and efficient conversion so that Ethy-Gen® II is not wasted and expected ethylene levels result from the conversion. The reason for a red light may be a fluctuation in the electrical supply, so there is a chance that this may be cleared by performing a reset. Follow the directions on the reset button. If the condition persists, contact us and we will get the issue resolved.

Why does Catalytic Generators make sure that their generators comply with UL® and TÜV Product Service Standards?
These are independent, private organizations formed to help reduce injury, loss of life, and property damage. Their scientists investigate and test products to evaluate their electric, fire, and casualty hazards. We felt that, since our ethylene generators are electrical instruments, it would be in the best interest of our customers to ensure that our equipment is of top quality and workmanship; passing these stringent safety standards would be the best test. With these marks on our ethylene generators, our customers can rest on the fact that the equipment has been found to be reasonably free from a foreseeable risk of fire, electric shock, and related hazards. You can see their web sites here:

Both organizations are OSHA Nationally Recognized Testing Labs.

Any other questions?
Please contact us and we will be glad to help.