Description

W1209 12V -55°C to +120°C Digital Thermostat Temperature Control Switch Sensor Module

The W1209 is a low cost yet highly functional thermostat controller. This module intelligently controls power to most types of electrical devices based on the temperature sensed by the included high accuracy NTC remote temperature sensor.

The cooler, heater or fan is connected to a power supply through the relay contacts K0 and K1, and the temperature on/off setpoints are programmed into the W1209 using the onboard Set, Increase and Decrease buttons and display. The relay contacts are then open and closed, acting as a power switch for the cooler/heater, based on the temperature measured by the NTC temperature sensor (included with the module) and the setpoints programmed into the W1209 controller.

Although this module has an embedded microcontroller, no programming knowledge is required. 3 tactile switches allow for configuring various parameters including on & off trigger temperatures. The on-board relay can switch up to a maximum of 125V AC or 14V DC at 20A. The current temperature is displayed in degrees Celsius via its 3 digit seven segment display and the current relay state by an on board LED.

Specifications:

• Temperature Control Range: -55 °C to +120 °C
• Resolution at -9.9 to 99.9: 0.1 °C
• Resolution at all other temperatures: 1 °C
• Measurement Accuracy: 0.1 °C
• Control Accuracy: 0.1 °C
• Refresh Rate: 0.5 Seconds
• Input Power (DC): 12V
• Measuring Input: NTC (10K 0.5%)
• Waterproof Sensor: 0.5M cable
• Output: 1 Channel Relay Output, Capacity: 20A
• Power Consumption:
  • Static Current: <=35mA
  • Operating Current: <=65mA
• Environmental Requirements:
  • Temperature: -10 ~ 60 °C
  • Humidity: 20-85%
• Dimensions: 48mm x 40mm x 14mm (1.9″ x 1.6″ x 0.6″) (LxWxH)

 

Settings Table
Press The “SET” Key To Enter The Main Menu
Code	Code Description	Setting Range	The Factory Setting
P0	Cooling / Heating	C / H	C
P1	Hysteresis setting	0.1 – 15	2
P2	Maximum set cap	24	120
P3	Minimum set limit	14	-55
P4	Temperature correction	-7.0 ~ 7.0 °C	0
P5	Delayed start time	0 – 10 minute	0
P6	High temperature alarm	0 – 110 °C	OFF
Off state to press “+ -” to power, can restore to the factory settings

How to Wire and Use the W1209 Thermostat:

 

Powering the Module:

• Connect a 12V DC power supply to the module using the + and – terminals.

Connecting the Load:

• Attach your device (fan, heater, etc.) to the relay terminals labelled K0 and K1.
• Ensure the power source for the load is connected in line with the relay, allowing it to act as a switch.

Operation:

• The module will control the power to your device based on the temperature settings you program using the onboard buttons.
• This setup ensures that your device operates at the desired temperature, efficiently managed by the W1209 thermostat.