XH W1209 12V Digital Temperature Controller Module

XH W1209 12V Digital Temperature Controller Module is a highly functional and affordable thermostat module built around an integrated microcontroller and an onboard relay. Consequently, this module provides precise temperature monitoring and control over a wide −50°C to +110°C range. Users can effortlessly set both the desired trigger temperature and the necessary hysteresis (difference) for switching external devices like heaters or coolers. Furthermore, the module’s direct 12V DC power requirement makes it an excellent choice for integration into automotive, solar-powered, and low-voltage embedded systems. Therefore, you should select the XH W1209 when you require reliable, digital thermal management at a minimal cost.

Key Features:

• High Precision Sensor: The module utilizes a waterproof NTC (Negative Temperature Coefficient) 10k thermistor probe, which offers accurate temperature measurements.
• Wide Control Range: It accurately monitors and controls temperatures across a broad spectrum, specifically from −50°C to +110°C.
• Programmable Hysteresis: Users easily configure the temperature difference required to turn the relay OFF after it turns ON, preventing rapid cycling.
• Onboard Relay: The integrated 10A single-pole, double-throw (SPDT) relay drives significant power loads, managing appliances up to 10A at 250 V_AC.
• Digital Display: A clear, three-digit LED display provides real-time temperature feedback and status indication to the user.

Technical Specifications:

• Control Range: −50°C to +110°C
• Resolution: 0.1°C (in the −9.9°C to +99.9°C range)
• Measurement Accuracy: ±0.1°C
• Input Voltage: DC 12 V
• Max Relay Current: 10 A @ 250 V_AC or 10 A @ 30 V_DC
• Quiescent Current: ≤ 35 mA
• Sensor Type: NTC (10k 0.5%) waterproof probe (Cable Length ≈ 1 meter)

Mechanical Specifications:

• Display: Three-digit 0.56-inch LED segment display
• Control Buttons: Three push buttons for setting parameters (SET, +, −)
• Mounting: Includes four Ø3 mm mounting holes for secure installation
• Relay Type: SPDT (Single Pole Double Throw) electro-mechanical relay

Dimensions:

• Module Dimensions (L x W): ≈ 48.5 mm x 40 mm
• Mounting Hole Pitch: ≈ 42 mm x 37 mm
• Weight: ≈ 35 g (Lightweight for flexible mounting options)

Pinout and Wiring:

• Poles + / P−: Connect the 12V DC power supply to these terminals (ensure correct polarity).
• Sensor Input: The two-pin JST connector connects the included NTC thermal probe to the board.
• Relay Output (K0/K1): K0 is the Normally Open (NO) contact; K1 is the Common (COM) contact. When the trigger condition is met, the relay switches K0/K1 closed.
• Wiring Note: Always connect your load (heater or cooler) in series with the AC or DC power source and the K0/K1 terminals. Avoid running high-current loads directly through the K0/K1 contacts without verifying compliance with the 10A limit.

Datasheet Reference:

• Download XH W1209 Temperature Controller Datasheet / Manual

Commonly Used in:

• Incubators and Terrariums: Maintains precise thermal conditions for biological environments.
• Brewing and Fermentation: Controls the temperature of wort or mash for optimal yeast activity and flavor profiles.
• DIY Heaters/Coolers: Provides a robust thermostat for small custom heating or refrigeration units.

Applications:

• Climate Control Systems: Manages internal temperatures in electronics enclosures or storage areas.
• Thermal Monitoring: Offers a simple, standalone device for monitoring critical points in industrial machinery or processes.
• Automotive Projects: Controls 12V fans or heating elements based on engine bay or cabin temperature.

Equivalent Models:

• W1209WK: A functional equivalent often featuring minor firmware or button layout differences but sharing the same core chip and relay specification.
• STC-1000: While slightly more complex and usually mains-powered, the STC-1000 serves a similar dual heating/cooling temperature control purpose.
• XH-W3001: Another popular budget temperature controller series that operates on higher voltage (220V or 110V AC) but performs the same core function.

Package Includes:

• 1 x XH W1209 12V Digital Temperature Controller Module
• 1 x NTC Waterproof Temperature Sensor Probe (1 meter)