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Wood dryers (drying kilns) catalogue (.PDF 4MB)
Wood dryers (drying kilns) catalogue (.PDF 4MB)

Catalogo Secadores de madera (.PDF 4MB)
ESP/ENG Catalogo secadores de madera / Wood dryers (drying kilns) catalogue (.PDF 4MB)

Katalog holztrockner Catalogue de sechoirs a bois (.PDF 4MB)
GER/FRA Katalog Holztrocknung / Catalogue de Séchoirs à bois (.PDF 5MB)

 Measurement & control equipment catalogue (.PDF 2.8MB)
Measurement & control equipment catalogue (.PDF 2.8MB)

Since 1990


 Automatic control unit used  for drying process control in small capacity conventional wood dryers (kilns)

This model is no longer produced!)

Wood dryers:
Conventional kilns
Dehumidifying dryers
Mini (Low-cost) kilns (NKS)
Heat pumps
Additional equipment
Power electric switch board

Catalogues and manuals:
Wood dryer catalogue (.pdf 3.7MB)
NIGOS dryers (.pdf 956KB)
User manuals
Measurement&controll equipment catalogue (.pdf 2.8MB)

Automatic controllers for wood drying:
MC-411R, MC-412, MC-900R, MC-502R,
MC-600, MC-2000
Automation of existent conventional kilns

Archive (obsolete products no longer produced):
 (MC-100RM, MC-500R, MC-100R, MC-1000)

Wood MC meters:
Portable moisture meter RVD-904
Nondestructive moisture meter DVD-240

Control unit for steaming chambers PD-02
ISPM-15 wood pallet sterilization unit MKS-05


  • Used in small capacity conventional wood dryers
  • Automatic, semiautomatic or manual control
  • PI type of control
  • Drying of all types of wood regardless of the starting moisture content
  • 12  drying regimes
  • 1 input for air temperature measurement
  • 1 input for EMC (UGL) measurement
  • Wood moisture content measurement in 4 points
  • 5 relay outputs

Automatic control unit MC-500R is a device that automatically controls drying process in small capacity conventional kilns mounted by "NIGOS - elektronik". Also, it can be used in conventional dryers as a cheaper substitution for more powerful MC-100.

MC-500R is based on MC-411R automatic control unit (which is intended for drying process control in dehumidifying kilns) with adequate modifications made in order to satisfy demands of drying in conventional kilns. Above all, it concerns introduction of PI type of control instead of ON/OFF type of control used at MC-411R. Also, this device has additional switches that provide manual control over part of the equipment. Additional advantage of this device is its low price, so it is mainly intended for use in low-cost mini kilns (NKS).

Optimal drying conditions are achieved through air temperature/humidity control. MC-500R controls the drying process automatically, semi-automatically or manually according to a device setup and data concerning air temperature, humidity and wood moisture content obtained from probes (1 measuring point for air temperature and humidity measurement and 4 points for wood moisture content measurement).

When in automatic control mode, MC - 500R follows the chosen drying regime and achieves optimal drying conditions in the kiln with automatic control of installed equipment (flow fans, flaps, sprinklers, etc.) through its relay outputs. There are 12 available drying regimes given to the user to chose from. In semiautomatic control mode, user can set desired setpoints for air temperature and humidity based on the personal experience, and the automatic control unit only maintain those values inside the kiln at the desired point.

Manual control mode is a specific function of this device. In that mode, switches and buttons on the right side of device are used. They provide user the ability to choose manual control mode for control of valves, flaps and sprinklers. In this mode, user can control equipment in the kiln manually (i.e., user can manually open or close the servo heating valve and the flaps, and turn on/off humidifying valve). In this mode, automatic control unit MC - 500R only displays the measured values for air temperature and humidity and wood moisture content, but its relay outputs are override by the appropriate switch, so MC-500R can not control the equipment in the kiln.

After a power failure has occurred, drying is automatically continued starting from the measured wood moisture content upon power supply reconnection.

Technical data of a MC - 500R automatic control unit are given in the following tables. 

 Main characteristics
   Power supply  220 Vac; 50Hz; 4VA max
 Number of inputs  6
 Number of outputs  5
 Displays  Two 2-digit and one 3-digit x 7 segment LED, red;
 One 1-digit x 7 segment LED, green
 Operating conditions  T: 0 ÷ 50 °C; RH: 5 ÷ 90%
 Storage  T: - 40 ÷ 85 °C; RH: 5 ÷ 90%
 Dimensions (WxHxD)(mm)  250 x 115 x 135
 Mounting hole (WxH)(mm)  252 x 117
 Weight  1000g


 Air temperature

 Number of inputs  1
 Range  0 ÷ 100 °C; 0 ÷ 1000mV

 Air humidity

 Number of inputs  1
 Range  3.4 ÷ 54 % EMC (UGL); - 250 ÷ 3000 mV (UGL)
 Wood moisture
 content inputs
 Number of inputs  4
 Range  5 ÷ 150 %

 Relay  Application        - opening of the valves (2-pin; 8A / 250 Vac)
       - closure of the valves (2-pin; 8A / 250 Vac)
     - opening of the flaps (2-pin;8A / 250 Vac)
     - closure of the flaps (2-pin;8A / 250 Vac)
    - humidifying (3-pin; 8A / 250 Vac)

 Digital  Communication standard  EIA 485
 Protocol  S - NIGOS

©2008 NIGOS-elektronik

18000 Nis • Srbija • Borislava Nikolica - Serjoze 12
Phone/fax. +381 18 / 211-212, 217-468 • E-mail: