Pollution Protection Systems Mumbai Pvt. Ltd. Manufactures Continuous Gas Monitoring System. Pollution Protection Systems Mumbai Pvt. Ltd. Has been awarded with ISO 9001:2000 certifications. Continuous Gas Monitoring System comes with power supply card, control card, facility card, mother board, 19" DIN standard rack, control panel, gas sensor, explosion proof sensor housing, flame proof junction box, 4 - 20 ma transmitter, flame proof cable glands etc.