Thermostat Module 220V AC Expand

Thermostat Module 12DC



W1209 Digital Temperature Control / Thermostat Switch with waterproof sensor probe

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WS1209 Digital Temperature Control Switch is a programmable thermostat. The same module can be used in both  controlling / maintaining Cold and Hot temperatures. Parameter 0 can be set to either Hot or Cold Control setting. The relay module is based on a microcontroller (MCU) and has 7 user configurable parameters accessible using 3 push buttons.


  • Precise Temperature Control upto 0.1C
  • Fast Acting Control of 0.5 seconds response time
  • With Water proof sensor
  • LED Display for Temperature, settings and warning
  • LED Relay Status Indicator
  • Output Relay can be used with both AC and DC circuits


  • Indoor Room Temperature Control
  • Aquarium temperature controller
  • Temperature controller for Controlled Temperature sheds
  • Food and Beverage temperature controller
  • Temperature controller for Health Care applications

Technical Specifications

  • Temperature Range :-50-110 ℃
  • Dimensions: 48.5 * 40mm
  • Temperature Control Mode: ON / OFF
  • Resolution: When temperature is 0.1℃, the resolution is -9.9~99.9, other temperature segment is 1℃
  • Control Accuracy: 0.1 ℃
  • Hysteresis Accuracy: 0.1℃
  • Refresh Rate: 0.5S
  • High Temperature Protection: 0-110℃
  • Supply Voltage: DC 12V
  • Static Current: ≤ 35MA, attract current ≤ 65MA
  • Operating Voltage: DC 12V
  • Output Relay Specifications:
    • Max Current: 20A @ 110VAC, 10A @ 220VAC or 20A @ 14VDC
    • Operating Voltage: 115VAC, 220VAC, 50VDC
  • Measurement Input: NTC (10K 0.5%) Waterproof Sensor
  • Environmental Requirements: -10 ~ 60 ℃ ,Humidity 20% -85%

Parameter List

Parameter Settings
Long press SET will take the system in parameter settings menu
SN Code Description Range Default Value
1 P0 Heating / Cooling C/H C
2 P1 Hysteresis 0.15 – 15C 2C
3 P2 Upper Limit +110C +110C
4 P3 Lower Limit -50C -50C
5 P4 Correction -7C to +7C 0C
6 P5 Delay Start time 0-10 min 0 min
7 P6 High Temp Alarm 0-110C OFF
Long press + – will reset to default values

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