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  • Smoke vs Heat vs Co Testing: What's the Difference (and Why it Matters)
Smoke vs Heat vs Co Testing: What's the Difference (and Why it Matters)

Smoke vs Heat vs Co Testing: What's the Difference (and Why it Matters)

Posted in: Test Category

When it comes to fire safety, testing isn't just a box-ticking exercise; it's the difference between reliable protection and dangerous uncertainty. At Detectortesters, we know that each type of detector plays a specific role in early warning systems, and accurate testing is vital to ensure they perform exactly as designed.

Understanding the difference between smoke, heat, and carbon monoxide (CO) testing helps installers, facility managers and safety teams make informed choices about how they maintain their systems. Although these detectors share a common goal of saving lives and property, the way they detect danger, and therefore how they must be tested, differs significantly.

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Smoke Testing

Smoke detectors identify the presence of combustion particles in the air. Some use optical (photoelectric) sensors that detect light scattered by smoke, while others rely on ionisation chambers that react to changes in air conductivity. To test these devices correctly, a test aerosol or smoke stimulus must be introduced into the sensing chamber, replicating real smoke conditions without causing contamination or damage. Using purpose-designed tools such as smoke test aerosols and dispensers ensures consistent results and compliance with standards such as BS 5839.

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CO Testing

Carbon monoxide is a colourless, odourless gas that can be fatal even in small concentrations, so CO detectors are critical in homes, hotels and commercial buildings. Testing them involves introducing a measured dose of CO stimulus to the sensor to verify correct operation and alarm response. This should always be carried out using specialist test equipment to maintain both safety and accuracy.

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Heat Testing

Heat detectors respond to changes in temperature rather than smoke, making them ideal for kitchens, garages and other environments where dust or steam could trigger false alarms. There are two main types. Fixed temperature detectors, which activate once a set threshold is reached, and rate-of-rise detectors, which respond to rapid increases in temperature. Testing requires a controlled heat source, such as a portable tester that delivers the required temperature directly to the sensor. Regular heat testing confirms that each unit will activate when it matters most, ensuring a complete and reliable safety network.

Why It Matters

Routine smoke, heat and CO testing is the only way to be sure every detector will perform correctly in an emergency. Using manufacturer-approved testers prevents damage, reduces false alarms and supports compliance with safety regulations.

At Detectortesters, we design and supply professional-grade tools for all types of detector testing, helping our customers maintain safer, smarter buildings with confidence.

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