A NEW BALANCE-TYPE ISOKINETIC SAMPLER WITH THIMBLE FILTER

Abstract

A new balance-type isokinetic sampler for measuring stack dust has been developed, incorporating a thimble filter with the nozzle. The nozzle diameter is enlarged at the tapping for the inside static pressure. Since the pressure loss in front of the nozzle is compensated by measuring the inside static pressure at the point where the velocity decreases, measurements can be carried out isokinetically without the need for any other compensation. The theoretical basis for the design of the nozzle is described and is compared with experimental data.
This method provides a way for automatic sampling based on gravimetric measurement of the stack dust.