According to DIN EN 149 and DIN EN 13247:7, a mask for FFP certification must have a defined separation efficiency for two different types of aerosol, NaCl and kerosene oil. For this purpose, the standard prescribes two different measuring devices or measuring methods. For the measurement with oil, the use of a scattered light photometer is required, this corresponds to the P_Ph_45° value. The measurement with salt requires the use of a flame photometer, the P_m value corresponds to the measured value of such a device. However, a flame photometer is an obsolete measurement technique. Since there is only one scattered light photometer in the PMFT 1000^® system, the flame photometer value is generated mathematically from the scattered light value. Other common standards regarding respirators (42Cfr84, Gb2626-2019) do not require the use of a flame photometer and only prescribe a scattered light photometer.