Fan Controller

Simple in-store drying control

Thermo Humidistat Fan Controller
Portable Controller
Thermo Humidistat Fan Controller
Static Controller

Drying grain using ambient air can be quicker and more likely to succeed using a Thermo-Humidistat fan controller. Knowing the grain moisture and setting appropriate humidity and temperature limits on the controller ensures that ventilation fans only blow or suck air suitable for drying into the grain. Sensors monitor ambient relative humidity and temperature and automatically start the fans if conditions fall below the pre-set limits.

The Thermo-Humidistat Fan Controller displays ambient temperature and relative humidity using built-in sensors connected to the unit.

Measuring grain moisture and using pre-set humidity limits on the controller ensures that ventilation fans do not draw damp air into the grain and are only used to dry the grain. Remember that ambient air cannot be guaranteed to dry grain and the speed of drying will vary according to ambient conditions.

Our Thermo-Humidistat Fan Controller can be made as a static or a portable unit. The Portable Thermo-Humidistat Controller solves the problem of sharing ventilating fans between crop stores on the same site or different sites, with just one controller. The portable controller can be easily moved between stores when the fans are re-located.

Thermo Humidistat Fan Controller
Thermo Humidistat Fan Controller
Static Thermo-Humidistat Controller

Controls any quantity of single or 3 phase fans, including large tunnel drying fans and StoreVent building air extraction fans. An automatic fan starter is required for each fan being controlled.

Portable Thermo-Humidistat 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.

Thermo Humidistat Fan Controller

Full Details and Specifications

Includes ambient display, air temperature and RH sensors.

Product Codes: Static version: FC003, Portable version: FCBM/TH…specify fan quantity & type.

Options: 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): 15 x 22 x 11cm. Power supply: 240v to controller

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 – Thermo-Humidistat: Accuracy: +/-0.2°C at 25°C, range: -10-70°C; +/-5%RH over 0-100% RH;

Considering using one of our Automatic Fan Controllers?

More information:

Keep in touch?

Keep up to date about future news, events and products from Martin Lishman.