SED-YGY-A — Handheld ATP Fluorescence Detector

The swab head contains a stabilized luciferase + luciferin enzyme-reaction reagent. The user samples a surface (cotton tip, 10x10 cm wipe at 45 degrees) or water (water-sampler swab), then snaps the upper-capsule valve to release the bacterial-lysis solution onto the cotton tip. Lysis frees ATP from microbial cells; the ATP combines with the luciferase reagent to emit photons. The swab is inserted into the instrument's optical chamber where an imported high-sensitivity photoelectric (PMT/SiPM) sensor counts the emitted photons over the 15 s detection window. The signal is converted to relative light units (RLU; 0-999999, sensitivity 1 RLU) and compared against user-set upper/lower limits. A built-in self-calibration light source verifies optical performance at power-on (30 s self-test).