Differential Temperature Controller For Dryer and Solar Heater


  • Model: TD220


Product Description:

This differential temperature controller can be used in situations where people want to achieve or maintain a fixed temperature difference between two different locations or chambers. Typical applications are: solar water heater control, drying oven temperature control, or basement anti-condensing temperature control.

It has two sensor inputs. The temperature difference between the two sensors (DT) is used for output control. The controller has two independent outputs also. One of the output is to controller a cooling device so that DT is limited to a specified range. The other output is for a heating device so that DT is maintained to be not less than a specified range.
This controller is a plug and play controller. No wiring is needed for the heater or cooler.  Both the heating and cooling control modes are simple on/off control, similar to a mechanical thermostat but with much higher precision due to adjustable hysteresis band, precise sensor and digital read out.  Anti-short function is provided for cooling to protect the compressor from being turned on with high pressure Freon.
Different operation temperature ranges of the two outputs can be set separately. Once the cooling range is set, the controller program will automatically limit the heating range to prevent both heating and cooling from being turned on at the same time.
Two digital silicon band gap sensors are used. The advantage is being much more reliable in moisture environment than thermistor sensor. They can be immersed over extended period of time. They also has a more uniform accuracy over an entire specified temperature range.

Temperature Control Range
  -50 ~ 105°C, -58 ~ 221°F
Temperature Resolution
0.1°C (between -9.9 ~ 99°C)
1°C (between -50 ~ 10°C, 100 ~ 120°C)
0.1°F (between -9.9 ~ 99.9°F )
1°F (between -58 ~ 10°F, 100 ~ 248°F)
Temperature Accuracy
0.5°C or 0.9°F
Temperature Control Mode
On/Off Control. Heating  and Cooling
Temperature Control Output
10A, 120 V or 240 V AC *
Audio Alarm
High and Low Limit
Sensor Type
Silicon Band Gap Sensor
Sensor Size
Diameter 0.25” OD (6.35 mm) x 1" (25 mm) long
Operating Temperature
-20 ~ 50°C (0°F ~ 120°F)
91 x 140 x 46 mm
Input Power 
85 ~242 V AC, 50 Hz / 60 Hz
Sensor Cable Length
Sensor 1: 6 ft (2 m)
Sensor 2: 12 ft (4m)
Power Cable Length
3 ft (1 m)
 1 Year



  • The controller can display temperature unit in Celsius or Fahrenheit.
  • Unlike the PID controller we sell, this on/off controller will not hold the temperature as tight if the system had very slow and delayed response. Some temperature overshoot is normal.
  • Either the heating or the cooling device is limited to 10 Amps. The output voltage is the same as the input voltage.  When the controller is plugged into 120V AC, the output will be 120VAC. If the controller is connected to 240 VAC, the output will be 240VAC also.
  • The input power plug is a US NEMA 5-15P plug. The output sock will accept US, Australia, or European continental plug (CEE7/7). Optional input & output travel plug adapters are offered. Please check here for more details.

Click here for the instruction manual.


Click here for its replacement sensor (free-hanging).
Click here for its replacement sensor (tri-clamp).


This product was added to our catalog on Tuesday 06 August, 2013.

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