Table of Contents
Advertisement
3 Specifications
The calculation of the FSN from the directly measured filter
blacking PB is carried out in three steps:
1 With the measured paper blackening (at reference pressure and
temperature), the effective filter loading (FL
2
3 The FSN is determined according to the calculated reference
filter loading.
The reference conditions (pressure, temperature) for calculating the
volume are 1000 mbar and 25 °C. This means that, irrespective of
where and under what conditions a measurement is carried out, the
measurement results remain comparable.
3.5.3.
Bosch number [Bosch]
The main difference between the Bosch number and the FSN is its
dependency on the current ambient pressure and the current
ambient temperature.
The Bosch number is calculated in the testo 338 as follows:
1 With the measured paper blackening (at reference pressure and
temperature), the effective filter loading (FL
2 The filter loading at the reference length (FLref) is determined
by the relationship between the actual length and the reference
length under operating conditions.
3 The Bosch number is determined according to the calculated
reference filter loading (under current ambient conditions).
14
The filter loading at the reference length (FL
by the relationship between the actual length and the
reference length of the flue gas column.
Filter smoke number/paper blackening
) is calculated.
eff
) is determined
ref
) is calculated.
eff
Advertisement
Table of Contents
