| 摘要 |
A detector system and method for accurately determining the occurrence of operating condition selected from the group comprising filter capacity of a filter assembly located in a natural gas pipe network owned, leased or rented by the end user-customer, an over-pressurization condition or an under-pressurization condition occurring in such natural gas pipe network, comprising the steps of: (a) introducing the natural gas stream to a filter selected from a group that includes at least activated charcoal and impingement adsorbing and absorbing media whereby natural gas contaminants concentrated in the gas stream at sufficient levels to be a detection threat by aperiodic loading in a natural gas pipe network owned, leased or rented by the end user-customer, in which contaminants become clumped into packets due to dampening effects of the compressor-driven equipment and multiple customer outlet usage that add to aperiodic loading of the natural gas stream coupled with surprising longevity of in situ contaminants, are filtered from the gas stream and captured, (b) passing the natural gas stream to a detection circuitry operatively connected to such natural pipe gas network, (c) detecting occurrence of an operating condition selected from the group comprising full filter condition, under pressurization condition and over pressurization condition within the customer piping network relative to pre-determined set point levels, (d) activating indication means to warn of occurrence of the operating condition when a set point level related to the operating condition, are exceeded by a drive signal whereby inappropriate and unsafe operating conditions are avoided. The detection circuitry uses a piezoresistive sensor which measures differential pressures between separate samples entering the sensor to provide a pair of output signals. <IMAGE> |
