A filter simulation system

摘要

A filter simulation system that includes a simulation filter 1 with a sensor 13 such that the volume of air passing through the filter can be determined. There is also a control means 16 with stored data relating to the nature of the toxic substance being simulated and the level/duration of protection the simulation filter provides against that toxic substance. In this way the filter simulation system can determine whether a correct simulation filter has been selected by a user and whether or not that filter has expired. In the event of expiry a simulation end of life service indicator (ELSI) 22 may be activated. In another aspect the device compares the volume of air detected by the sensor means by comparing the volume of air detected by the sensor means with stored data based on a predetermined threat situation. In another aspect, there is means to calculate the volumetric air flow rate passing through the filter for determining whether the simulation filter is being used.