Temperature Differential
Fan Controllers

The fastest and most energy-efficient way to cool grain

Temperature Differential Fan Control
Portable Controller
Temperature Differential Fan Control
Static Controller

Straight off the combine or the drier, it is essential to cool grain quickly with temperature differential fan control to avoid condensation, insect infestation and fungal problems. Temperature differential fan control is the fastest way to cool grain stored with low volume ventilation such as Pile-Dry Pedestals or FloorVent Pedestals. It helps to maintain high quality grain and ensure safe, long-term storage.

The temperature differential fan controller automatically switches fans on if the crop temperature is 5°C more than the air temperature. As the ambient air temperature decreases during the storage period it maintains a 5°C temperature difference between the grain and the air and progressively cools the grain.

The controller displays crop and ambient temperatures and includes sensors with extension cables to measure the air and crop temperatures and a frost setting override. It can be used in manual or automatic mode.

Martin Lishman Temperature Differential Fan Controller.
Temperature Differential Fan Control

Static Temperature Differential Controller

Controls any quantity of single or 3 phase fans, including Pile-Dry and FloorVent crop cooling fans and StoreVent building air extraction fans. An automatic fan starter is required for each fan being controlled

Portable Temperature Differential Controller

Controls automatically up to 5 single phase or 3 phase portable fans. It has built-in starters for each fan being controlled and can be repositioned when fans are moved between ducts and stores. It is supplied with all plugs and sockets to connect the fans to the controller and the controller to the power supply and just requires a suitable 32 Amp power supply, so extensive electrical installation work is avoided.

Temperature Differential Fan Control

Temperature Differential Control with Crop Temperature Monitoring

Crop monitoring can be added to both types of the Temperature Differential Controller using up to twelve 2m or 3m long crop temperature sensors and suitable length extension cables. Sensors are selected using a Multi-Sensor Switch connected to the controller. This assists store management decisions by showing where to locate ventilation fans. The highest reading sensor should be selected to switch the fans on automatically.

Full Details and Specifications

Includes ambient & crop temperature display, frost setting, auto/manual & on/off functions; 2m rigid crop temperature sensor with 20m extension cable, air temperature sensor with 10m extension cable.

Product Codes: Static version: FC049/A, Portable version: FCBM…specify fan quantity & type.

Options: 3m crop sensor (Product code: FC055), longer extension cables (FC046/length), automatic fan starters with and without time delay (code depends on fan type)


Static Automatic Controller – to control any quantity of single or 3 phase fans for wiring directly to a control panel or suitable automatic starters. Dimensions (control unit only):13 x 13 x 10cm

Portable Automatic Controller – board-mounted unit for up to four single or five 3 phase fans (depending on rating), with 32A power input socket & plug, fan connection plugs and sockets, built-in starter/overloads. Dimensions: 61 x 45 x 19cm. Weight: c.10Kg. Power supply: 240v or 415v as specified

Controller Performance: Accuracy: +/-1°C at 25°C, range: -50-99°C;

Considering using one of our Automatic Fan Controllers?

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