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

Start time – when in the morning will the display system start operation
Stop period – when in the afternoon will the display 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 limitations of temperature desired
Maximum/minimum humidity – What are the limits of humidity desired
Gap positions – this units the percent open or close placement under different conditions such as early on a winter morning to reduce thermal shock or during the summer to provide better shading. The gap measures and speed of motion can be controlled in some systems.
Time delay – under changeable weather conditions this avoids frequent opening and closing
Wind speed – To reduce warmth loss, the screen could be closed early under high wind speed conditions
Snow detection – this can open the display screen 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 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 leading edge of the screen material. Control is either with a manual switch 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.

A clock is incorporated to open and close an energy screen base on sunrise and sunset. It Motor Gearboxes For Greenhouse really is adjusted weekly to account for the lengthening or shortening of the daylength. A picture sensor is roofed to activate the system when the light level within the greenhouse gets to a preset level either too low through the winter or too high during the summertime. Temperature and humidity sensors may be included to provide control when preset levels are reached.