STC-1000 Digital Thermostat with Dual Relay — Precision Control for Brewing, Refrigeration, and Aquariums
When temperature control is critical, even a few degrees can make all the difference. Whether you are home-brewing, maintaining an aquarium, or protecting industrial refrigeration equipment, you need a reliable solution. Standard single-relay thermostats often fall short when you need to manage both heating and cooling from a single device. The STC-1000 provides the precision and versatility required for demanding environments.
Note: This product includes a 1m 10K NTC sensor. Power cables and plugs are not included. Please verify the electrical load compatibility of your equipment before installation.
Why choose this model? (Key Advantages):
- Independent Dual Relay — Manage both heating and cooling functions from one compact unit, eliminating the need for two separate thermostats.
- High Precision (±0.2°C, 0.1°C resolution) — Maintain exact temperatures, which is vital for controlled fermentation or maintaining the cold chain.
- Waterproof 10K NTC Sensor (1m included) — Safely submerge the sensor directly into wort, beer, water, or coolant without risk of damage.
- Configurable Compressor Delay (F3: 1–10 min) — Prevents rapid cycling, significantly extending the lifespan of your fridges and freezers.
- Offset Calibration (F4: ±10°C) — Easily adjust for sensor variance with a single parameter, ensuring perfect accuracy without replacing hardware.
- Fire-Retardant ABS Housing — Built to withstand technical environments where standard plastic units might fail.
- Energy Efficient — Consumes less than 3W, ensuring it runs 24/7 without impacting your electricity bill.
Performance and Technical Details
The STC-1000 operates on an ON/OFF control principle with configurable hysteresis (F2: 0.3–10°C). This ensures the relay doesn’t switch unnecessarily, reducing wear and tear while balancing the power consumption of your connected equipment.
The 4-digit LED display remains clearly visible even in dimly lit cellars or technical cabinets. Should the temperature exceed your set limits or the sensor disconnect, the integrated alarm and E1 error code will alert you immediately, helping you prevent spoiled batches or refrigeration failures.
| Parameter | Value / Detail |
|---|---|
| Measurement Range | -50 … 99°C |
| Control Range | -50 … 110°C |
| Accuracy | ±0.2°C |
| Display Resolution | 0.1°C |
| Control Type | 2 Independent Relays (Heating / Cooling) |
| Included Sensor | 10K NTC, 1m cable, waterproof |
| Power Supply | AC 110–220V, 50/60Hz |
| Power Consumption | < 3W |
| Housing Material | Fire-retardant ABS |
| Ambient Temperature | 0 … 60°C |
| Operating Humidity | 20–84% RH (non-condensing) |
| F1 – Set Point | -50 … 99.9°C |
| F2 – Hysteresis | 0.3 … 10°C |
| F3 – Compressor Delay | 1 … 10 minutes |
| F4 – Offset Calibration | -10 … +10°C |
Programming and Usage Instructions
- Connect the thermostat to an AC 110–220V power source and place the NTC sensor in the target area.
- Press and hold the SET button for 3 seconds to enter the function menu (F1–F4).
- Use the ▲ / ▼ buttons to navigate between parameters and adjust values.
- Set F1 (Set Point) to your desired temperature (e.g., 20°C for ale fermentation, 4°C for food refrigeration).
- Set F2 (Hysteresis) to 1–2°C for an ideal balance between precision and switching frequency.
- If controlling a compressor, set F3 to at least 3 minutes to protect against rapid restarts.
- If the sensor reading differs from a reference thermometer, use F4 (Calibration Offset) to adjust.
- Press SET to save each parameter. The controller will automatically return to the current temperature display.
Package Contents
- 1x STC-1000 Digital Temperature Controller
- 1x Waterproof 10K NTC Sensor (1m cable)
Frequently Asked Questions
Can the STC-1000 control heating and cooling simultaneously?
Not simultaneously, but alternatively. The two relays operate in either heating or cooling mode—they cannot be active at the same time. This prevents control conflicts and protects your equipment.
Can the NTC sensor be submerged in liquids like beer, wort, or water?
Yes. The 10K NTC sensor is waterproof and designed for direct immersion in water, beer, wine, wort, or liquid refrigerants. It is perfectly suited for aquariums, fermentation vessels, and liquid-based systems.
Does it work with the standard 230V mains voltage in Ireland, Luxembourg, and Malta?
Yes. The STC-1000 accepts AC 110–220V, making it fully compatible with the standard 230V power grid in Ireland, Luxembourg, and Malta. No adapter or transformer is required.
The display shows E1. What should I do?
The E1 code indicates a sensor error, usually meaning the NTC sensor is disconnected or has a poor contact. Check the wiring connections; if the error persists, the sensor may need to be replaced.
What is the maximum load for the relays? Can I connect a large compressor?
The relays are typically rated for 10A/220V—please check the label on your unit for the exact rating. For heavy-duty compressors or larger loads, use an external contactor controlled by the STC-1000 relay.
Is this suitable for home brewing?
Yes, the STC-1000 is a staple in DIY brewing projects. Simply connect the cooling relay to a modified fridge, set your desired temperature (e.g., 18–22°C for ales), and the controller will maintain a consistent fermentation profile from start to finish.
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