I have bought mpxv7002dp and have no problem with it regarding the hardware and software. After days of usage, the sensor is occupied with dust particles and I cannot use it. Regarding the maintenance of the sensor, can i add a filter to avoid dust particles, so that once the dust particles are occupied on the filter itselft and i can clean and reuse it without affecting the sensor. What kind of filter will be effective and should not disturb the input pressure. Kindly clarify.