How to Use thermoMETER: Examples, Pinouts, and Specs

The thermoMETER CT-SF15 by Micro Epsilon is a high-precision infrared temperature sensor designed for non-contact temperature measurement. This device is capable of accurately measuring surface temperatures without physical contact, making it ideal for applications where traditional contact-based thermometers are impractical or impossible to use. The thermoMETER is widely used in industrial, medical, and research environments due to its reliability and precision.

• Industrial Automation: Monitoring the temperature of machinery, conveyor belts, or production lines.
• Medical Applications: Measuring body temperature or surface temperatures in sterile environments.
• HVAC Systems: Ensuring proper heating, ventilation, and air conditioning performance.
• Food Processing: Monitoring cooking or storage temperatures to ensure food safety.
• Research and Development: Measuring temperature in experimental setups or prototypes.

The following table outlines the key technical specifications of the thermoMETER CT-SF15:

The thermoMETER CT-SF15 features a standard connector with the following pinout:

1. Power Supply: Connect the V+ pin to a DC power source (5-30 V) and the GND pin to ground.
2. Output Signal: Choose between the analog or digital output based on your application:
   • For analog output, connect the Analog Output pin to an ADC (Analog-to-Digital Converter) or a voltmeter.
   • For digital output, connect the Digital Output pin to a microcontroller or data acquisition system.
3. Emissivity Adjustment: If the surface emissivity differs from the default setting, adjust the emissivity input to match the target material. Refer to the material's emissivity table for accurate values.
4. Mounting: Secure the thermoMETER in a stable position, ensuring it has a clear line of sight to the target surface. Avoid obstructions or reflective surfaces that may interfere with measurements.

• Emissivity Settings: Ensure the emissivity setting matches the material being measured for accurate readings.
• Ambient Conditions: Avoid using the sensor in environments with excessive dust, smoke, or steam, as these can affect accuracy.
• Distance-to-Spot Ratio: Maintain the recommended distance-to-spot ratio to ensure the target area is fully within the sensor's field of view.
• Calibration: Periodically calibrate the sensor to maintain accuracy, especially in critical applications.

The thermoMETER CT-SF15 can be interfaced with an Arduino UNO using its analog output. Below is an example code snippet to read temperature data:

// Define the analog pin connected to the thermoMETER's Analog Output
const int thermoMeterPin = A0;

// Variable to store the analog reading
int analogValue = 0;

// Conversion factor (adjust based on the sensor's output range and scaling)
const float voltageToTempFactor = 100.0; // Example: 10 mV per degree Celsius

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

void loop() {
  // Read the analog value from the thermoMETER
  analogValue = analogRead(thermoMeterPin);

  // Convert the analog value to voltage (assuming 5V reference)
  float voltage = (analogValue / 1023.0) * 5.0;

  // Convert the voltage to temperature
  float temperature = voltage * voltageToTempFactor;

  // Print the temperature to the Serial Monitor
  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.println(" °C");

  // Wait for a short period before the next reading
  delay(500);
}

1. No Output Signal

   • Cause: Incorrect wiring or insufficient power supply.
   • Solution: Verify all connections and ensure the power supply is within the specified range (5-30 V DC).

2. Inaccurate Temperature Readings

   • Cause: Incorrect emissivity setting or environmental interference.
   • Solution: Adjust the emissivity setting to match the target material and ensure the sensor's line of sight is unobstructed.

3. Fluctuating Readings

   • Cause: Electrical noise or unstable power supply.
   • Solution: Use a stable power source and shield the sensor's cables from interference.

4. Sensor Overheating

   • Cause: Operating in an environment exceeding the sensor's temperature limits.
   • Solution: Ensure the ambient temperature is within the specified operating range (-20°C to 85°C).

Q: Can the thermoMETER measure the temperature of shiny or reflective surfaces?
A: Yes, but you must adjust the emissivity setting to account for the reflective properties of the surface. For highly reflective materials, consider using a surface treatment (e.g., matte paint or tape) to improve accuracy.

Q: How do I clean the sensor lens?
A: Use a soft, lint-free cloth and isopropyl alcohol to gently clean the lens. Avoid abrasive materials or harsh chemicals.

Q: Can the thermoMETER be used outdoors?
A: Yes, but ensure it is protected from direct exposure to rain, dust, or extreme environmental conditions. Use an appropriate housing if necessary.

Q: What is the response time of the sensor?
A: The thermoMETER CT-SF15 has a response time of 150 ms, making it suitable for dynamic applications.