Gun thermometers, also known as infrared thermometers or temperature guns, are increasingly used in various settings—from checking engine temperatures in workshops to monitoring body temperatures during health screenings. Their non-contact design allows users to measure temperatures from a distance, offering both convenience and hygiene. However, to help ensure more reliable readings and maintain user safety, proper use of a gun thermometer is important.
This guide outlines key steps and best practices for using a gun thermometer safely and accurately.
Understanding How Gun Thermometers Work
A gun thermometer measures surface temperature using infrared technology. It detects the infrared radiation (heat) emitted by an object and translates it into a temperature reading, which is displayed almost immediately on the screen.
Most models include a laser pointer to assist with aiming the thermometer precisely. It’s important to note that these devices are designed for surface readings and may not be suitable for measuring internal temperatures.
Step-by-Step Guide to Using a Gun Thermometer
1. Read the User Manual
Start by reading the manufacturer’s instructions. Different models may have different settings, optimal distance-to-spot ratios, and calibration options.
2. Ensure the Thermometer is Properly Calibrated
Some devices may need calibration before use. Consult the user manual for guidance on how to calibrate your gun thermometer, or seek assistance from a professional technician if necessary.
3. Aim at the Correct Target Area
Hold the thermometer at the recommended distance from the surface. This distance can vary depending on the model’s distance-to-spot (D:S) ratio. For example, a 12:1 D:S ratio suggests the device measures a 1-inch area at 12 inches away.
4. Avoid Measuring Reflective Surfaces
Highly reflective or shiny surfaces (like stainless steel or polished metal) can potentially distort infrared readings. If you need to measure such a surface, you might want to consider placing a piece of non-reflective tape or paint on it and measuring that area instead.
5. Hold Steady and Wait for the Reading
Once the device is aimed, press the trigger and hold it until the reading appears. Some devices have a hold function that can retain the reading after release.
6. Clean the Sensor Regularly
Dirt, dust, or oil on the sensor lens can affect accuracy. Clean the lens gently with a soft cloth and alcohol solution to help maintain optimal performance.
7. Store Properly When Not in Use
To protect the infrared sensor and battery, store the device in a dry, cool place, ideally in a protective case.
Safety Tips When Using a Gun Thermometer
- Never point the thermometer at a person’s eyes, especially if it uses a laser. Laser exposure can potentially harm eyesight.
- Use the thermometer only for its intended purposes. For example, do not attempt to measure internal body temperature or cook temperatures inside food with a surface thermometer.
- Avoid environments that exceed the device’s specified temperature range.
- Do not use the thermometer in explosive or flammable environments unless it is specifically rated for that use.
Common Mistakes to Avoid
- Measuring from the wrong distance: Being too close or too far from the target can distort readings.
- Using on inappropriate surfaces: Materials with low emissivity may lead to inaccurate results.
- Not allowing time for the device to acclimate: If the thermometer is moved from one extreme environment to another, allow it a few minutes to adjust.
When to Use a Gun Thermometer
- Checking HVAC vent temperatures
- Monitoring machine or motor performance
- Verifying surface temperatures in food service or manufacturing
- Conducting non-contact body temperature screening (with medical-grade models)
- Performing electrical diagnostics
Final Thoughts
Gun thermometers are versatile tools that can offer quick, safe, and relatively accurate surface temperature readings when used correctly. Whether for industrial maintenance or health checks, following best practices can help ensure reliable data and protect the integrity of the device.
By understanding the limitations and proper handling of your gun thermometer, you can make the most of this modern diagnostic tool while keeping safety and accuracy in mind.
