Description
The 12V Thermal Resistor Sensor Module with Thermostat Switch is a self-contained temperature control board that combines an NTC thermistor probe, a microcontroller, and an electromagnetic relay to automatically switch heating or cooling equipment based on a user-programmable temperature setpoint. Unlike simple sensor modules that only provide a HIGH/LOW signal, this module includes an LED display and pushbuttons for setting precise trigger temperatures, making it a complete thermostat solution for incubators, aquariums, 3D printer enclosures, and fermentation chambers .
The module operates from DC 12V and includes a waterproof NTC 10K probe (typically 0.5m cable) for accurate temperature measurement across -50°C to +110°C with 0.1°C resolution . The onboard 10A relay can directly switch loads such as heaters, fans, or solenoids. Users can configure the module for heating mode (H) or cooling mode (C) via the parameter menu, and adjust hysteresis (deadband) to prevent rapid relay cycling . The 3-digit LED display shows the current temperature and flashes during setpoint adjustment.
Critical limitations: This is a budget-tier module with variable quality control. User reviews report that some units fail or show inaccurate readings, and the relay rating (10A) should not be exceeded—use an external contactor for higher-power loads . The module is not waterproof (only the probe is), and the 12V supply must be stable; some users report unreliable operation below 9V .
Features
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Complete Thermostat Function: NTC probe + microcontroller + relay in one board; no external controller required .
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Programmable Setpoint and Hysteresis: Adjust trigger temperature and deadband via pushbuttons and LED display .
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Heating/Cooling Mode Selection: Parameter P0 switches between heating (H) and cooling (C) logic .
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Waterproof NTC Probe Included: 10K thermistor with 0.5m cable for liquid or air temperature sensing .
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10A Relay Output: Directly switches heaters, fans, and small appliances (verify load does not exceed rating) .
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Wide Temperature Range (-50 to 110°C): Suitable for freezers, incubators, and general thermal control .
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High-Temperature Alarm: Configurable alarm threshold (P6) to protect equipment .
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Delay Start Function: Parameter P5 delays relay activation (0–10 minutes) for compressor protection .
Technical Specifications
| Parameter | Specification (W1209-type thermostat) |
|---|---|
| Sensor Type | NTC 10K (0.5% tolerance), waterproof probe |
| Supply Voltage | DC 12V (operating range approx. 9–12V) |
| Temperature Range | -50°C to +110°C |
| Resolution | 0.1°C (-9.9 to 99.9°C); 1°C (other ranges) |
| Control Accuracy | 0.1°C |
| Refresh Rate | 0.5 seconds |
| Relay Rating | 10A (some listings state 20A; verify your unit) |
| Static Current | ≤35mA |
| Relay Active Current | ≤65mA |
| Probe Cable Length | Approx. 0.5m |
| PCB Dimensions | Approx. 48×40×14mm |
Reviews
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