In smaller sized greenhouses, a manual program opened and closed by hand could be installed. These work simplest when the screen material is backed by a monitor system.
Start time – when each morning will the display screen system start operation
Stop time – when in the afternoon will the display system stop operation
Light level – in what light strength will the screen become activated Rack Drive For Greenhouse either to open or close
Maximum/minimum temperature – what exactly are the limits of temperature desired
Maximum/minimum humidity – What are the limits of humidity desired
Gap positions – this models the percent open or close placement under different circumstances such as early on a winter early morning to lessen thermal shock or through the summer to supply better shading. The gap methods and speed of movement can be controlled in a few systems.
Time delay – under changeable weather conditions this avoids frequent starting and closing
Wind speed – To reduce high temperature loss, the screen can be closed early below high wind speed conditions
Snow detection – this may open the display and turn on heat when it starts to snow.
The typical system uses nylon monofilament or stainless cables to support the screen materials. The screen material can either rest on top of the network of cables or be suspended by hooks from the cables. A gearmotor powers a drum or rack and pinion that moves the industry leading of the screen materials. Control is either with a manual switch or electronic controller.
Based on the over, the grower is required to enter the following parameters in to the controller:
A climate station is required to provide outdoor light level, temperature, humidity, wind and rain or snow conditions.