In smaller sized greenhouses, a manual program opened and closed yourself could possibly be installed. These work easiest when the screen materials is backed by a monitor system.

Start time – when in the morning will the screen system start operation
Stop period – when in the afternoon will the screen system stop operation
Light level – at what light intensity will the screen become activated either to open or close
Maximum/minimum temperature – what are the limits of temperature desired
Maximum/minimum humidity – What exactly are the limits of humidity desired
Gap positions – this models the percent open up or close position under different circumstances such as early on a winter early morning to reduce thermal shock or through the summer to provide better shading. The gap actions and speed of movement can be controlled in some systems.
Time delay – under changeable climate this avoids frequent opening and closing
Wind speed – To lessen temperature loss, the screen could be closed early below high wind speed conditions
Snow detection – this can open the display and turn on heat when it begins to snow.
The typical system uses nylon monofilament or stainless steel cables to support the screen materials. The screen material can possibly rest on top of the network of cables or end up being suspended by hooks from the cables. A gearmotor powers a drum or rack and pinion that movements the industry leading of the screen materials. Control is usually either with a manual change or electronic controller.

Based on the over, the grower must enter the next parameters into the controller:

A climate station is required to provide rack drive for greenhouse china outdoor light level, temperature, humidity, wind and rain or snow conditions.