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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!)

Automatic controller unit for wood dryers MC-502R

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
  • ON/OFF type of control
  • Drying of all types of wood regardless of the starting moisture content
  • 20  drying regimes
  • 1 input for air temperature and EMC measurement
  • Wood moisture content measurement in 4 points
  • 5 relay outputs
  • Light indication of alarm
  • Communication standard RS-485
  • Can be connected to PC
Automatic control unit MC-502R is a device that automatically controls drying process in small conventional kilns. It can also be used in bigger conventional dryers as a cheeper option for automatic controllers MC-600 and MC-2000.

This device is based on older automatic control unit MC-500R which is modified to further improve drying process in conventional dryers. This regards above all on adding the relay output for fans direction reversion. Also, buttons for starting and stopping of the drying process are added. Device alone is now placed in plastic box suitable for wall mounting which makes installation process much easier. Further more, a newest concept of temperature, EMC and wood MC data aquisition is applied. MC-502R standard configuration includes measurement box DS-04 attached to measurement module MM-04 which transfers data to MC-502R. These boxes are interconnected using LIYCY 10x0.34 cable which is provided and delivered by "NIGOS" with the rest of equipment. This way, the nuber of cables used for installation is greatly reduced and the control unit itself can be placed on greater distance than before (up to 30 m).

Aditional advantage of this device is its low price, so it is ideal for low-cost dryers (NKS).

Pictures on the right show connection of MC-502R with MM-04 and DS-04 boxes, as well as enlarged picture of DS-04 box with fitted probes.
Automatic controller MC-502R connection

Connection box DS-04

MC-502R achieves optimum conditions for wood drying inside the chamber through air temperature and humidity control. MC-502R controls its relay outputs automatically, semi-automatically or user can do it manually based on data obtained from temperature and EMC probes (in 1 point) and wood MC probes (obtained from 4 points). In addition, control of drying process is adjusted according to user settings.

In automatic operation mode, MC-502R follows chosen drying schedule (regime). There are 20 invariable (built-in) schedules which are inserted in unit's memory by "NIGOS" during production and which can not be changed.

In semi-automatic operation mode user set the desired values for temperature and EMC based on personal experience and measured wood MC and automatic control unit MC-502R only maintain this values inside the chamber.

In manual operation mode, buttons and switches on the right side of device are used. Switches give the user an ability to choose manual control of heating valve, servo-controlled flaps and valve for spraying. Button is used for change (reversion) of fans direction. While in manual operation mode, MC-502R only displays measured values for T, EMC and MC, but it has no influence on the relay outputs and equipment inside the chamber. User himself must control temperature and humidity by pressing the appropriate buttons. 

After power failure, if it was started, drying will automatically continue when power is reconnected starting from measured wood MC.

Automatic control unit is delivered with following equipment included (standard configuration):
  • Automatic control unit MC-502R: 1 pcs
  • Measurement module MM-01: 1 pcs
  • Measurement box DS-04 with fitted temperature probes: 1 pcs
  • EMC paper holder which is fitted on DS-04 box: 1 pcs
  • EMC paper in quantity sufficient for 2 years drying: 1 set
  • Set of wood MC probes for different wood thickness: 1 set
  • Cables for boxes connection: 12m
  • Tephlone cables for wood MC measurement: 8m x 4 pcs

Warranty for automatic control unit MC-502R is 5 years.

Technical data of MC-502R are given in the following tables:
 Main characteristics
   Power suply  220 Vac; 50Hz; 4VA max
 Number of inputs  6
 Number of outputs  5
 Communication lines  1
 Displays  Two 2-digits and one 3-digits 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)  215 x 180 x 115
 Weight  1200g (control unit only)



 Number of inputs  1
 Range  -20 ÷ 110 °C; -200 ÷ 1100mV


 Number of inputs  1
 Range  2.0 ÷ 30 % EMC (UGL)

Wood MC

 Number of inputs  4
 Range  5 ÷ 160 %

Relay  Number of outputs  5
 Characteristics  3-pin; 8A / 250Vac, uninterrupted load 3A max
 Number of outputs and application  1 output for temperature control (heating valves)
 2 outputs for fans work and direction control (reversion)
 1 outputs for humidity control (servo-controlled drying flaps)
 1 output for spraying

 Digital  Communication standard  RS 485
 Protocol  S - NIGOS
 Connection speed toward PC  1200 ÷ 9600 bps

©2011 NIGOS-elektronik

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