Instructions for Use
– SCHMIDT
®
Flow Sensor SS 20.500
Page 26
For flow measurement the measuring ranges from zero flow to the
selectable end of the measuring range w
N,max
(see Table 6).
Voltage mode (U)
Current mode (I)
𝑤
𝑁
=
𝑤
𝑁,𝑚𝑎𝑥
10 𝑉
∙ 𝑈
𝑂𝑢𝑡,𝑤
𝑁
𝑤
𝑁
=
𝑤
𝑁,𝑚𝑎𝑥
16 𝑚𝐴
∙ (𝐼
𝑂𝑢𝑡,𝑤
𝑁
− 4 𝑚𝐴)
Table 6 Standard for representation of flow measurement
The measuring range of the medium temperature T
M
is specified be-
tween -40 and +85 °C (see Table 7).
Voltage mode (U)
Current mode (I)
𝑤
𝑁
= (
125
10 𝑉
∙ 𝑈
𝑂𝑢𝑡,𝑇
𝑀
− 40) °𝐶
𝑤
𝑁
= [
125
16 𝑚𝐴
∙ (𝐼
𝑂𝑢𝑡,𝑇
𝑀
− 4 𝑚𝐴) − 40] °𝐶
Table 7 Standard for representation of medium temperature measurement
Note regarding commissioning:
The temperature output normally provides approx. 5 V resp. 12 mA
because the typical prevailing room temperature of approx. 20 °C cor-
responds to about half of the measuring range.
U
Out
[V]
0
110
w
N
[%]
10
0
20
11
40
80
60
100
4
2
6
8
110
w
N
[%]
0
20
40
80
60
100
I
Out
[mA]
20
4
21,6
12
8
16
U
Out
[V]
0
90
-40
T
M
[°C]
10
4
2
20
11
40
+ 85
60
-20
6
8
I
Out
[mA]
0
90
-40
T
M
[°C]
20
4
8
20
22
40
+ 85
60
-20
12
12
16
2
