In smaller sized greenhouses, a manual system opened and closed by hand could possibly be installed. These work simplest when the screen material is backed by a rack drive for greenhouse china monitor system.
Start time – when each morning will the display 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 be activated either to open or close
Maximum/minimum temperature – what are the limits of temperature desired
Maximum/minimum humidity – What exactly are the limitations of humidity desired
Gap positions – this pieces the percent open 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 motion can be controlled in a few systems.
Time delay – below changeable weather conditions this avoids frequent opening and closing
Wind speed – To reduce heat loss, the screen can be closed early below high wind speed conditions
Snow detection – this may open the display screen and turn on heat when it starts to snow.
The typical system uses nylon monofilament or stainless steel cables to support the screen material. 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 techniques the leading edge of the screen material. Control is either with a manual switch or electronic controller.
Based on the above, the grower is required to enter the next parameters in to the controller:
A climate station is required to provide outdoor light level, temperature, humidity, wind and rain or snow conditions.