Six-stage Viable Sampler and Sampling Probe for BFE Testing of Mask

A testing setup for bacterial filtration efficiency (BFE) of mask is developed. This setupincludes a novel sampling probe and a six-stage viable sampler (having cutoff-size of 7.1, 4.7, 3.0, 2.1, 1.1,0.65 micron at 28.3 litre/min flow rate) designs in accordance with the IS 9473:2002, IS 19289: 2014, EN14683:2019, and ASTM F2101-19 standards. The setup comprises of particle generation system, mixingand mask holding probe, six-stage sampler, differential pressure gauge, dryers, flow meter followed by airpump, etc. accommodated in laminar hood. This is the only six stage sampler system which can segregateparticles of 3.0 micron size as stated in relevant standards, the cutoff of other sampler is not 3.0 micron.

For mask testing and air monitoring purposes.

Indigenous, first in India, impactor based sampler, sharp cutoff sizes, setup is in accordance with standards for BFE testing.