In smaller greenhouses, a manual system opened and closed yourself could possibly be installed. These work simplest when the screen material is supported by a monitor system.
Start time – when in the morning will the display screen system start operation
Stop period – when in the afternoon will the display screen system stop operation
Light level – in what light strength will the screen be activated either to open up or close
Maximum/minimum temperature – what exactly are the limitations of temperature desired
Maximum/minimum humidity – What are the limits of humidity desired
Gap positions – this units the percent open up or close position under different conditions such as early on a winter morning to lessen thermal shock or through the summer to provide better shading. The gap steps and speed of movement can be controlled in a few systems.
Time delay – below changeable weather conditions this avoids frequent opening and closing
Wind speed – To lessen warmth loss, the screen can be closed early below 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 rack drive for greenhouse china materials. The screen material can possibly rest along with 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 leading edge of the screen material. Control is either with a manual switch or electronic controller.
Based on the above, the grower must 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.