Temperature Monitoring Systems

GrainWatch™ temperature monitoring is the most effective method to ensure that optimal conditions for commodity stored in silos or plain storage remain.

GrainWatch™ temperature monitoring systems may be used in storage of traditional cereals as well as energy raw materials like wood pellets. Considering the commercial value of the commodity, it is a long-lasting investment worth making. Storage is a vital link in the production chain. Temperature monitoring is also a formal requirement in some countries.

The measuring process starts with our patented sensor cables hung from the silo roof.  Together with switch-hub technology, these cables form a network with a single point of access.

Grain-Watch™ temperature cables (patent SE536675) are made from durable steel conduit cable. They come in two different diameters – GWSL 1100 or 2100 –  depending on the height of the silo and how much pressure they must sustain.

Temperature monitoring may also be conducted with our temperature spear GWTL-R for plain storage facilities. Regardless of type – cables or spears – internal cable sensors are calibrated for life, no further calibration or maintenance is needed – ever.

Temperature data is visualized locally on a PC or Hand Reader GW-200, or completely unrestricted on a smartphone or tablet using our mobile app GrainWatch Plus where also many other processes of the farm may be displayed.

System Advantages

  • Fully digital system with 1-wire digital sensor technology
  • Custom fit for any storage facility
  • Modular system – easily expandable
  • Calibration-free. For life.
  • Temperature cables in two sizes, 9.8 or 17.0 mm
  • 2- and 3-core cable connections between components
  • Stabile RS-485 bus PC/PLC
  • ATEX- and IECEx-certified
  • Readout via Hand Reader, PC, Mobile App or plainly Modbus RTU
  • Versatile. Many fields of use; grains, pellets etc

To ensure production quality and maximum safety for our clients, GrainWatch™ products and processes are certified according to ISO, ATEX, IECEx and GOST-R.

GrainWatch™ for Energy Raw Materials

A great deal of energy raw materials for fired heating systems today come in the form of pellets, preferably of wood. It is obvious that heat and fire is hazardous during the storage phase. GrainWatch™ probes placed inside the pellets silo will register any “hot spot” and alert the producer to take necessary action. Installation and visualization of data is identical to that of grain temperature monitoring.

GrainWatch™ for Cereals

Heat is an indicator for moisture; the moister the grain, the greater its capability to store and diffuse heat. The reference diagram shows how increased moisture and heat affect the time that grain can be stored safely. Increased kernel moisture content and high kernel temperatures drastically decrease storage time.

Detecting “hot spots” caused by grain respiration, moisture, insect infestation, mold or fungus is vital to protect the quality of the cereals. GrainWatch temperature cables or rollable temperature spears placed inside the silo will register these “hot spots” and alert the supervisor to take action to avoid loss of quality and commercial value, even spoilage.


The amount and length of the temperature cables to efficiently monitor the grain temperature, depend on the dimensions (diameter, eaves height, total height) of the silos. Many silo manufacturers provide brackets for temperature cables in fixed positions in their roof assembly. Other customers need an individual setup. We are happy to cater to both. Our project managers use our flexible dimensioning software to make sure you get optimal coverage.

Accurate grain temperature monitoring in big silo bins requires a multi-cable setup. A basic rule is that one GrainWatch™ cable monitors a radius of 3 meters.

Round bin, diameter in meters 6 8 10 12 14 16 18 20 25 30 35 40
Round bin, diameter in feet 20 25 32 40 45 52 60 65 80 100 120 135
Recommended number of temp. cables 1 3 4 5 6 7 8 11 17 22 30 34
Square bin, side length in meters 5 6 8 10 12 14 16 18 20
Square bin, side length in feet 16 20 25 32 40 45 52 60 65
Recommended number of temp. cables 1 2 4 5 9 9 12 16 16

GrainWatch temperature monitoring products guard the quality of cereals.

GrainWatch™ temperature monitoring guards the quality of cereals…

… as well as biomass pellets, e.g. of wood.