In smaller sized greenhouses, a manual program opened and closed by hand could possibly be installed. These work easiest when the screen material is supported by a track system.
Start time – when each morning will the display system start operation
Stop time – when in the afternoon will the display screen system stop operation
Light level – at what light intensity will the screen rack drive for greenhouse china become activated either to open or close
Maximum/minimum temperature – what exactly are the limits of temperature desired
Maximum/minimum humidity – What are the limitations of humidity desired
Gap positions – this units the percent open up or close placement under different circumstances such as in early stages a winter morning to lessen thermal shock or during the summer to provide better shading. The gap techniques and speed of movement can be controlled in some systems.
Time delay – below changeable weather conditions this avoids frequent starting and closing
Wind speed – To reduce temperature loss, the screen can be closed early under high wind speed conditions
Snow detection – this can open the display screen and turn on the heat when it starts to snow.
The standard system uses nylon monofilament or stainless steel cables to aid the screen materials. The screen material can possibly rest along with the network of cables or be suspended by hooks from the cables. A gearmotor powers a drum or rack and pinion that techniques 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 following parameters into the controller:
A weather station is needed to provide outdoor light level, temperature, humidity, wind and rain or snow conditions.