SF6 high-precision infrared sensor module

1 Overview SF6 gas as insulating and arc extinguishing medium gas commonly used in electrical equipment, especially in high-voltage circuit breakers, transformers, transformers, capacitors, surge arresters, fuses, which are widely used. Leaks, equipment pressure reduction, reducing the insulating capacity; pollution and damage to the atmosphere, increasing the greenhouse effect; in the lower space to accumulate, leading to brain hypoxia staff, even rapid suffocation accidents; partial discharge, under the influence of factors such as high temperature, SF6 gas It will produce as SF4, SF2, SOF2 such toxic decomposition. SKA-520 is an infrared absorption detection principle using the NDIR gas sensor module to determine the concentration of the size of the absorption 10.5um according to SF6 gas. SKA-520 uses MEMS light source, optical cavity structure and a special dual-channel detectors, spatial reference double optical path compensation, the microprocessor signal acquisition, processing and output. SKA-520 has good selectivity, high sensitivity, non-oxygen-dependent, long life, low power consumption; built-in temperature sensor, temperature compensation can be performed; both UART, PWM, 485 or modbus (user selectable) output and analog voltage output; Alarm can be set up to facilitate customer applications. SKA-520 can be widely used in power industry SF6 gas leak detection, and other occasions SF6 gas concentration analysis. 2 Technical parameters 2.1 Operating Conditions Description Symbol Value Unit Storage Temperature Tstg -20 to 80 C Operating temperature TA -30 to +60 C Operating Humidity HA 0 to 90% RH Operating Pressure PA 0.8 to 1.2 ATM 2.2 Electrical Characteristics Description Symbol Minimum Typical Maximum Unit Supply Vs 9 10 11 V Maximum operating current Imax 30 mA source current Iavg 20 mA source frequency f 0.2 5 10 Hz Warm up time twarm 30 60 90 Sec 2.3 Performance Parameter Description Typical Units detection range (customizable) 1500 ppm Accuracy ± 20ppm ± 5% true value ppm T90 pumping 5 seconds Repeatability Zero <± 50 ppm 50% FS <± 5% measured value life of 10 years