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Products / Commercial & Industrial Heating / Controllers

2 Independent channels

Electronic temperature controller for two-channel temperature maintenance

  • 2 independent control channels
  • High temperature measurement accuracy
  • High interference immunity of measurement channels
  • External sensors can be placed at max. distance of 100 m
  • Simultaneous display of temperatures for 2 channels
  • Simultaneous display of heating state for 2 channels
  • Thermal control capability within the temperature range from -60 °C to +500 °C
  • Equipped with built-in matrix display
  • Easy adjustment of controlled temperatures
  • DIN-rail mounting


Connection diagram


PT-420 electronic controller is designed for temperature measurement and pre-set temperature maintenance control. Its application range includes industrial electric heating of pipelines, vessels, various volume capacities, etc. Also domestic application of the controller is possible for temperature maintenance in electric heating systems. The device ensures a possibility of temperature measurement by means of measuring sensors of thermal resistance type.

Principle of operation

The controller realizes two-position (on-off) relay control method. The upper and the lower limits of the temperature maintenance range should be set at the device installation.


The controller features high temperature measurement accuracy together with high interface immunity of the temperature measurement channels. Thanks to the above, the device may me conveniently used when the sensors are placed within a distance of up to 100 m, up to 8 different sensor types may be used.


The controllers of this type are widely used for monitoring and maintenance of the preset temperature value of process pipelines and vessels.

PT-420 devices are also very easy to use in freezing chambers where ground heating under the chamber floor prevents the ground from freezing, preventing floor lifting. Two control channels allow to control several chambers from one device.

Convenience of use

The built-in display facilitates the device checkup and adjustment. Four control buttons located on the front panel provide user friendly interface.


The controller’s construction provides its installation in a control cabinet. The device is designed for DIN-rail mounting (4 modules).


1100% of the devices pass factory tests. The preset parameters can be stored in the device non-volatile memory.


Temperature control rage from -200 °C to +1100 °C*
Temperature measurement accuracy 0,5 %
Temperature indication accuracy 0,1°C
Measurement channels number 2 channels
Output relay channels 2 channels
Analog output DC voltage: 0...10 V
Types of temperature sensors used** The sensors are defined by the parameter W100***. Type 0 - Pt100, | W100 = 1,3850 (-200 °C … +850 °C);
Type 1 - Cu100, | W100 = 1,4260 (-50 °C … +200 °C);
Type 2 - Cu100, | W100 = 1,4280 (-200 °C … +200 °C);
Type 3 - Cu50, | W100 = 1,4260 (-50 °C … +200 °C);
Type 4 - Cu50, | W100 = 1,4280 (-200 °C … +200 °C);
Type 5 - Pt50, | W100 = 1,3850 (-200 °C … +850 °C);
Type 6 - Pt100, | W100 = 1,3910 (-200 °C … +1100 °C);
Type 7 - Pt50, | W100 = 1,3910 (-200 °C … +1100 °C);
Maximum relay current 16 A, 230 VAC
Operating temperature from +5 °C to +40 °C
Enclosure protection grade IP20
Power supply 230 VAC -15%/+10%, 50–60 Hz
Consuming power not mote than 5 W
Mounting option in control cabinet DIN-rail, 4 modules
Overall dimensions 70x90x66 mm
Weight: 300 g

* Depends on the type of the temperature sensor used.
** Not included in the delivery kit, should be ordered separately.
*** W100 – ratio of sensor’s resistance at 100 °C to its resistance at 0 °C.


Warranty period of operation – 1 year after the date of sale.

Ordering information

Electronic temperature controller PT-420.
Temperature sensor (resistance thermometer, 1 pcs for each measurement channel).
The sensor type to be clarified at ordering.