Aerospatiale Nord 262: Digital Thermometers

Non-contact infrared thermometers are useful for initial temperature checks of various aircraft components like engine parts, bearings, or hydraulic lines, allowing for quick scans without disassembly. They are also ideal for checking temperatures in hard-to-reach areas like engines, where direct contact could be unsafe or impractical.

Yes, non-contact thermometers are generally safe to use around aircraft electronics since they don't involve direct contact or introduce electromagnetic interference. They allow technicians to monitor temperatures without touching sensitive equipment.

Contact thermometers, such as K-type thermocouples, are preferred when more precise readings are required, especially for internal aircraft components. They are useful when the surface material or environment makes non-contact measurements less reliable.

Pocket digital thermometers are portable, easy-to-use tools for quick, on-the-go temperature measurements of various aircraft components. Their compact design makes them convenient for routine checks and spot inspections during maintenance procedures.

Distance-to-spot ratio (D:S ratio) refers to the relationship between the distance from the thermometer to the target and the size of the area being measured. It essentially determines the accuracy of the temperature reading by ensuring that the target is fully within the thermometer’s field of view.

A higher D:S ratio means the thermometer can measure smaller areas from a greater distance. This is ideal for measuring small objects or areas that are difficult to reach.

A lower D:S ratio means the thermometer needs to be closer to the target to measure a smaller area. This is useful for measuring larger areas or objects from a shorter distance.

When choosing a non-contact (IR) thermometer, consider the D:S ratio based on your specific application and the size and distance of the objects you’ll be measuring.

Emissivity, a material’s ability to emit or absorb infrared radiation, is a crucial factor to consider when using an IR thermometer.

A perfect black body has an emissivity of 1.0, meaning it absorbs and emits all infrared radiation. A perfectly reflective surface has an emissivity of 0.0, meaning it reflects all infrared radiation.

IR thermometers measure the infrared radiation emitted by an object. If the emissivity of the object is unknown or incorrect, the temperature measurement will be inaccurate.

Many IR thermometers, such as those made by TPI, have adjustable emissivity settings. By calibrating the thermometer to the correct emissivity of the target, you can ensure accurate temperature measurements.