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MC • Edition 2022.08 • No
. 279 663 R
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. -0
11 … 76
6.4 Accuracy class / closing pressure class
AC and SG data according to EN 334 do not constitute
a declaration with respect to the modulation range. For
field use it is important to know the minimum and maxi
-
mum flow rates. Therefore, the accuracy characteristics
'accuracy class and shut-off pressure class' were deter
-
mined which can be guaranteed for a flow rate of 1:10.
The AC values of the above table refer to the maximum
possible percentage deviation of the output pressure
from the adjusted set-point, in which Q
max
/ Q
min
≤ 10
is observed.
p
d
Q
min, pu1
Q
p
u1
Q
min, pu2
Q
max, pu1
Q
max, pu2
p
u2
p
ds
p
ds
x (1-AC/100)
p
ds
x (1+SG/100)
p
ds
x (1+AC/100)
Abbrevia-
tion
Description
AC
Accuracy class
p
d
Outlet pressure
p
u1/2
Inlet pressure
p
ds
Set nominal value of the outlet pressure
SG
Lock-up pressure class
Q
min / pu1/2
AC minimum flow volume at a specific inlet pressure p
u
(lower limit of the volume flow at which the stable
operating conditions for a given nominal value within the given operating temperature range).
Q
max / pu1/2
AC maximum flow volume at a specific inlet pressure p
u
(upper limit of the volume flow at which a given ac
-
curacy class for a given nominal value within the given operating temperature range).
Содержание FRM-NOC 100025 HD
Страница 17: ...MC Edition 2022 08 No 279 663 Rev 0 17 76 A B C D E A B C D E F Type UHD F Type HD...
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