Thermal Imaging & Infrared Measurement

Thermal imagers and infrared thermometers help maintenance professionals compare surface temperatures without making contact with the target. They are widely used to investigate heat patterns around motors, bearings, electrical connections, switchgear, drive components, process equipment, pipework and workshop machinery. Industrial Shed’s range includes portable thermal imagers, smartphone-connected options and handheld infrared thermometers from Klein Tools, Accud, Kincrome, Aptella, Precision Specialty Tools, SP Tools and Sykes-Pickavant.

Thermal imaging versus infrared point measurement

A thermal imager presents a temperature map across an area, helping users locate a hot or cold pattern and compare nearby components. A handheld infrared thermometer returns a measurement from a defined target area and can suit routine checks when the target is accessible, the reading distance is controlled and the surface is understood. Neither type is automatically better: the appropriate instrument depends on what must be compared and how the result will be used.

Before choosing, check the stated temperature range, accuracy, distance-to-spot ratio, laser guidance, emissivity settings, image storage, display or smartphone compatibility, charging arrangement and supplied accessories. A tool-only product may require a compatible battery or platform component. For phone-connected imagers, check the supported device connection before purchase.

Take readings that can be compared

Temperature readings are affected by surface finish, reflections, target size, distance, airflow, load and emissivity. A shiny metal surface can behave very differently from a painted or oxidised surface. Establish a like-for-like comparison where possible: compare similar components under similar load and from a similar distance. Record the operating condition, location and observed difference so the result can be reviewed later.

A thermal anomaly is a signal to investigate—not an automatic diagnosis. Do not use a thermal image to prove a circuit is de-energised, to bypass isolation requirements or to make a safety decision outside the instrument’s stated purpose. Electrical testing and maintenance must still follow competent procedures.

Use thermal data within a maintenance workflow

Where an abnormal heat pattern appears, inspect the equipment condition and consider the operating context before planning the next step. Pair thermal checks with Borescopes & Inspection Cameras when internal visual access is required. For suitable electrical test equipment, explore Electrical Test & Measurement. For related cleaning, lubrication or assembly work, return to Industrial Maintenance & MRO.

Thermal Imaging & Infrared Measurement FAQs

Can an infrared thermometer measure temperature through glass?

No. The instrument reads the surface it sees rather than reliably measuring the temperature beyond ordinary glass. Check the target surface and the product guidance before relying on a reading.

What does distance-to-spot ratio mean?

It indicates how the measurement area increases as the instrument moves away from the target. Make sure the intended target fills the relevant measurement area at the working distance.

Can a thermal camera identify an electrical fault by itself?

No. It can reveal an unusual heat pattern that warrants investigation. A competent diagnosis still needs operating conditions, physical inspection, correct electrical testing and equipment-service requirements.

Are all infrared thermometers suitable for industrial equipment?

No. Check the temperature range, target size, distance-to-spot ratio, accuracy and environmental suitability against the job. A small close-range item and a large distant target require different capabilities.