W1209 12V Digital Temperature Controller Module With Display and NTC Temperature Sensor Standard Quality

Overview

• This digital temperature controller module features a waterproof NTC temperature sensor and is designed to control electrical devices based on the temperature it detects. It’s a cost-effective and highly functional solution, ideal for a wide range of applications.
• Powered by a 12V source, the module is equipped with a 7-segment display that shows the current temperature in °C. It also includes three buttons that allow you to easily set your desired temperature range and other parameters.
• No programming skills are required, as it comes with a built-in microcontroller. The onboard relay can switch up to 240V AC at 5A or 14V DC at 10A, making it suitable for controlling various electrical devices. The relay’s status is indicated by an LED light.
• The NTC thermistor sensor provides highly accurate temperature measurements with a precision of 0.1°C, and being waterproof, it ensures reliable operation in different environments.

Display & Settings

Displaying the Current Temperature

• By default, the thermostat shows the current temperature in °C.

• When in any other mode, making no input for ~5 seconds will return it to this display.

Setting the Trigger Temperature

1. Press the SET button → display flashes.

2. Use + / – to adjust trigger temperature (0.1°C increments).

3. Wait ~2 seconds → value is stored → display returns to current temperature.

Setting Parameters

• Long press SET (≥5s) → display shows P0.

• Use + / – to cycle through parameters (P0 – P6).

• Press SET to edit a parameter.

• Adjust with + / –, then press SET to confirm.

• No input for ~5s → returns to default temperature display.

Parameter Settings

P0 – Cooling or Heating

• C (default): Relay energizes when temperature is reached (use for cooling/AC).

• H: Relay de-energizes when temperature is reached (use for heating).

P1 – Hysteresis

• Sets how much temperature must change before relay switches.

• Example: If trigger = 25°C, hysteresis = 2°C → relay off below 23°C.

• Prevents rapid switching.

P2 – Upper Limit

• Limits maximum trigger temperature (default = 110°C).

P3 – Lower Limit

• Limits minimum trigger temperature (default = -39°C).

P4 – Temperature Offset Correction

• Adjusts reading if probe has offset (e.g., long cable).

P5 – Trigger Delay

• Delays relay switching after reaching trigger.

• Range: 0–10 mins (in 1-min steps).

P6 – High Temperature Alarm

• Sets alarm cutoff temperature.

• Relay turns OFF at set value → display shows “—”.

• Relay won’t re-energize until below alarm threshold.

• Default = OFF.

Settings Chart

Applications

• To measure and display temperature.

• To turn any application ON/OFF based on temperature (AC or DC).

• Example Projects:

  • Fire Alarm System

  • Auto Cut-Off Electric Water Heater

Features

Power Consumption

• Static Current: ≤35mA

• Current: ≤65mA

Environmental Requirements

• Operating Temperature: -10 ~ 60°C

• Humidity: 20–85%