In greenhouse farming the CO2 for CO2 fertilisation is increasingly often delivered by several sources, such as burner/boiler, WKK, OCAP and pure CO2. Often only one CO2 set is supplied from one of the CO2 sources. For this the inlet of the CO2 set is connected to a nozzle with a selection valve (source valve) for each source.

These nozzles are produced on request and can be delivered completely with source valves and source valve control.

Source valve control:
Good source valve control in conformity with the regulations is necessary. According to the regulations, uncontrolled flow of flue gases to the boiler room or greenhouse must be prevented in order to avoid undesired and unsafe situations. For this servomotor-operated source valves have been provided with limit switches. The Thermeta Service BV source valve control in a separate model or built into the burner panel has been constructed such, that it complies with these principles and will switch off the CO2 set or the burner dependent on the situation. Alarm is given through failure lamps on the panel (and/or external).

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