Endress+Hauser MMP20 SONO Mobil, Руководство по эксплуатации

Страница: 29 / 64

MMP20 SONO-DIS (option D)
Hauser Page 29
The following table clearly illustrates the influence of large gravel pieces when sampling:
Influence of
water content
of gravel
when
sampling
Formulation A
with a
relatively high
fines content and
low 16/32mm
gravel content
Formulation B
with gap-grading,
i.e. low 4/8mm gravel
content and high
16/32mm gravel
content
Kiln-dried sample
of
1.5 kg
+-2 large
gravel pieces
produce an
error of
+-9 liters/m
3
Approx. 5 pieces of
16/32mm gravel
Approx. 15 pieces of
16/32mm gravel
Kiln-dried sample
of
5.0 kg
+-2 large
gravel pieces
produce an
error of
+-3 liters/m
3
Approx. 16 pieces of
16/32mm gravel
Approx. 100 pieces of
16/32mm gravel
It is important to bear in mind that
a single piece of 16/32mm gravel weighs between
10 and 50g .
Assuming an average weight of 20g per piece of gravel, it suddenly becomes clear why the sampling
process is much more important than it initially appeared!