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Digital Electronic Thermostat Universal 12V W1209 with 20A Relay and Temperature Probe
The W1209 programmable digital thermostat allows precise temperature control in systems with a range between -50°C and +110°C. Powered by 12V DC, it uses an included NTC probe for temperature measurement and a double normally closed / normally open relay for control.
It is ideal for controlling solenoid valves, electric heaters, motors, compressors, fans, and other equipment. For higher currents, we recommend using an additional external contactor.
W1209 Digital Thermostat Technical Specifications:
| Parameter | Value |
|---|---|
| Temperature range | -50°C to +110°C |
| Compatible probes | NTC (included), PTC |
| Resolution | 0.1°C |
| Measurement accuracy | ±0.1°C |
| Hysteresis accuracy | 0.1°C |
| Refresh rate | 0.5 seconds |
| Current consumption | 35mA – 65mA |
| Digital display | 0.28 inch, 3 decimal digits |
| Power supply | 12V DC |
| Operating temperature | -10°C to 60°C, humidity 20% – 85% |
| Dimensions | 48.5 x 40 mm |
Programmable Parameters and Settings:
The thermostat allows the programming of several parameters to suit your application, such as heating/cooling mode, hysteresis, temperature limits, sensor calibration, delay, alarm, and more. Settings are made by pressing the SET button for 5 seconds.
P0: Heating/Cooling mode (C/H) – default setting CP1: Hysteresis (0.1 – 30) – default setting 2
P2: Upper temperature limit (max 110°C) – default 110
P3: Lower temperature limit (min -50°C) – default -50
P4: Sensor calibration (-7°C to +7°C) – default 0
P5: Delay between threshold and relay (0-600 sec) – default 0
P6: High temperature alarm (0-110°C) – default OFF
Factory reset is done by pressing both the “+” and “-” buttons simultaneously.
Important Warnings:
- Keep probe wires separate from live wires and power connections.
- Do not exceed the maximum relay current (20A). Use an external contactor for larger loads.
- Install the sensor with the bulb facing upwards, away from air currents or fans, for accurate measurement.
Application Examples:
Control of electric heaters, solenoid valves, refrigeration compressors, fans, surveillance and alarm systems, lighting, and other electrical equipment requiring precise temperature regulation.
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