SED-70QTTC-H — Portable Pump-Suction Combustible Gas Detector
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SED-70QTTC-H portable pump-suction combustible gas detector with catalytic combustion sensing. Imported high-precision sensor. Measurement range 0–100%LEL; accuracy ±3%FS; resolution 0.1%LEL (low range) / 1%LEL (full ran
مبدأ العمل
Catalytic combustion principle: combustible gas drawn by the internal micro-pump passes over a heated platinum/palladium catalyst bead; the exothermic reaction changes bead resistance, which is measured by a Wheatstone bridge circuit to derive gas concentration. The pump suction force is adjustable across 10 levels(up to 1 L/min) to accommodate various sampling distances. Temperature and pressure compensation circuitry corrects readings for ambient conditions. Concentrations are displayed on LCD dot-matrix and logged; alarms trigger at user-set thresholds.
