For the answer to this question, we refer you to the following documents:
Our CA installations are static installations, our “ship it fresh” solution has been specially developed to keep products in optimal condition during transport.
For CA storage it is very important that the cold store is built gas-tight because the oxygen content and CO2 concentrations are adjusted in relation to the standard atmosphere.
For example, in most cases the oxygen will be reduced extremely from 21% to <2%. If the cold store is not gas-tight, this concentration cannot be maintained.
That is why CA cells are built in a special way, including a gastight coating and a gastight door (FFT-Projects). A “standard” cold store cannot therefore simply be used for CA storage. It is, however, possible to install our palliflex systeem in a “standard” cold store because the palliflex units are gas-tight by themselves. The palliflex system is often used for the storage of soft fruit such as blueberries, red currants and cherries.
After a measurement, or at a set time, the scrubber will start, to maintain the set CO2 level in the cold store.
If the scrubber does not function, or does not function properly, the CO2 levels can rise.
The O2 in a cold store should remain stable during the storage season. Factors like gastightness of the cold stores, the weather (pressure differences), settings of the cooling, aeration, adsorber, etc all play a role. The cold store should be gas tight, so the production of CO2 is equal to the uptake of O2 . If there is a leak (door, floor, air buffer or valve), O2 can enter the cold store.
In the beginning of the storage season, the O2 can be lowered with a VPSA. The VPSA has to have the right settings, and must be connected to the right cold store. It is also possible that the cold store is not (yet) closed well enough. If the O2 was already at a low level and rises rapidly, there usually is a different problem.
The CO2 adsorber contains a sensor of paddle that measures the air flow. If the flow is different than usual, the sensor will trigger an alarm. If the sensor light turns red while the CO2 adsorber is active, the alarm is triggered.
Check the CO2 adsorber valves and the cold store valves. If one valve doesn't open, the pressure difference will cause the alarm.