Dual Spectrum® Infrared PM-34CBEH sensors detect fuel explosions and fires in enclosed spaces of armored personnel carriers. They are operational in any lighting condition and are effective through oil, smoke, dirt and other obscurants. The sensors contain a third infrared detector that provides infrared signature information to the logic located in the control electronics. This provides discrimination capability which prevents false alarms from a Kinetic Energy (KE) or High Explosive Anti-Tank (HEAT) round penetration that does not result in an explosion or fire. The suppression system is triggered only when an explosion or fire occurs.

The sensors incorporate built-in test circuitry that monitors detectors, electronics, and window contamination. The sensors integrate radiometric heat detection circuitry that monitors the entire field of view for overheat conditions. Radiometric heat sensing remains operational even when thick layers of contamination are present.