How to Use STC 1000: Examples, Pinouts, and Specs

The STC 1000 is a versatile digital temperature controller manufactured by SMKN 1 CERME. It is widely used for regulating temperature in a variety of applications, including incubators, refrigeration systems, aquariums, and brewing setups. The device features a dual display for real-time temperature monitoring and setpoint configuration, offering precise control with adjustable parameters such as hysteresis, temperature calibration, and delay protection for compressors.

• Incubators for hatching eggs
• Refrigeration systems for food storage
• Aquariums to maintain water temperature
• Homebrewing for fermentation temperature control
• Greenhouses for climate regulation

The following table outlines the key technical details of the STC 1000:

The STC 1000 has a total of 8 terminals for wiring. The pin configuration is as follows:

1. Power Connection: Connect the live (L) and neutral (N) wires of the AC power supply to terminals 1 and 2, respectively.
2. Sensor Connection: Attach the included NTC temperature sensor to terminals 7 and 8. Ensure the sensor is placed in the environment where temperature regulation is required.
3. Relay Outputs:
   • Connect the cooling device (e.g., a compressor) to terminals 3 (NO) and 4 (COM).
   • Connect the heating device (e.g., a heater) to terminals 5 (NO) and 6 (COM).
4. Configuration:
   • Power on the device and use the front panel buttons to set the desired temperature, hysteresis, and delay time.
   • Refer to the user manual for detailed instructions on parameter adjustment.

• Ensure the total current of connected devices does not exceed the relay ratings (10A at 220V AC).
• Place the temperature sensor in a location free from direct heat or cold sources for accurate readings.
• Use proper insulation and secure connections to prevent electrical hazards.
• For refrigeration systems, configure an appropriate delay time to protect the compressor from frequent cycling.

The STC 1000 is typically a standalone device, but it can be monitored using an Arduino UNO by reading the temperature sensor. Below is an example code snippet for interfacing the NTC sensor with an Arduino:

// Example code for reading an NTC sensor with Arduino UNO
// Note: This assumes the NTC sensor is connected to an analog pin (e.g., A0).

const int sensorPin = A0;  // Analog pin connected to the NTC sensor
float resistance = 10000; // Resistance of the NTC sensor at 25°C (10kΩ)
float beta = 3950;        // Beta coefficient of the NTC sensor
float tempK, tempC;       // Variables for temperature in Kelvin and Celsius

void setup() {
  Serial.begin(9600); // Initialize serial communication
}

void loop() {
  int analogValue = analogRead(sensorPin); // Read the analog value
  float voltage = analogValue * (5.0 / 1023.0); // Convert to voltage
  float resistanceNTC = (5.0 - voltage) * resistance / voltage; // Calculate resistance
  
  // Calculate temperature in Kelvin using the Steinhart-Hart equation
  tempK = 1 / (1 / (25 + 273.15) + (1 / beta) * log(resistanceNTC / resistance));
  tempC = tempK - 273.15; // Convert Kelvin to Celsius
  
  Serial.print("Temperature: ");
  Serial.print(tempC);
  Serial.println(" °C");
  
  delay(1000); // Wait 1 second before the next reading
}

1. Display Shows "EE" or Error Code:

   • Cause: Sensor is disconnected or damaged.
   • Solution: Check the sensor wiring and ensure it is securely connected to terminals 7 and 8. Replace the sensor if necessary.

2. Temperature Readings Are Inaccurate:

   • Cause: Sensor placement is incorrect or calibration is needed.
   • Solution: Place the sensor in a stable environment away from direct heat or cold sources. Use the calibration function to adjust readings.

3. Relay Does Not Activate:

   • Cause: Incorrect wiring or parameter settings.
   • Solution: Verify the wiring of the heating and cooling devices. Check the setpoint and hysteresis values to ensure they are configured correctly.

4. Device Does Not Power On:

   • Cause: Faulty power supply or internal damage.
   • Solution: Check the AC power supply and connections to terminals 1 and 2. If the issue persists, consult a technician.

• Can I use the STC 1000 with DC-powered devices? No, the STC 1000 is designed for AC-powered devices only. Use a DC-AC relay module if DC devices need to be controlled.

• What is the maximum cable length for the NTC sensor? The sensor cable can typically be extended up to 10 meters, but ensure proper shielding to avoid interference.

• Can I use the STC 1000 for sub-zero temperature applications? Yes, the STC 1000 supports temperatures as low as -50°C, making it suitable for freezers and cold storage.

This concludes the documentation for the STC 1000. For further assistance, refer to the official user manual or contact the manufacturer.