Gravimetric analysis samples require filters to be weighed both before and after sampling to determine the amount of contaminate collected. Zefon pre-weighed cassettes eliminate the inconvenience of pre-weighing filters by providing the filter weight on each cassette prior to sampling.
Zefon begins the process of manufacturing pre-weighed cassettes by letting each filter equilibrate to the environmental conditions of 68° F and 50% relative humidity. Filters are then weighed using advanced microbalance equipment which records the weight. After reading the weight, filters are removed, placed into cassettes and sealed with a label bearing the weight and a unique serial number.
Features:
2 or 3 piece housing
Preloaded, ready to use
Each cassette labeled with serial number
Color coded to indicated filter type
5 Decimal weight accuracy (.00001g)
Use of Pure Homopolyer PVC filters provide excellent weight stability
PVC filters specially designed with no silica and low ash properties
Zefon 37mm Pre-Weighed Cassettes are available in the following configurations:
