®
Instruction manual
NivuSonic Clamp on
Page 16
4.3
Flow calculation
In case of using single-path or two-path installations in one level under the con-
dition
A
Q
m
⋅
=
υ
Given:
υ
m
average flow velocity
A
cross-sectional flow area
it is required to involve a velocity coefficient k in order to compensate the differ-
ence between measured velocity
g
υ
and average velocity
m
υ
within the cross-
sectional area.
g
m
k
υ
υ
=
Using the transit time of the signal it is possible to calculate flow subsequently as
described below:
−
⋅
Φ
⋅
⋅
⋅
=
⋅
⋅
=
−
−
−
−
1
2
2
1
2
1
2
1
1
1
cos
2
t
t
L
A
k
A
k
Q
g
υ
4.4
Device variations
NivuSonic CO transmitter and the respective flow velocity sensors are available
in different versions. The tables below provide an overview on various possibili-
ties.
Transmitters
The transmitters primarily vary in terms of power supply and data transmission
options. The current type of device is indicated by the article number, which can
be found on a weatherproof label on the bottom of the enclosure.
From this article key the type of device can be specified.
NIM-
M3W
Standard version with 5 relays, 4mA outputs, 4 mA inputs
Data Transmission
IN
Internet communication via Intranet
MA
Internet communication via internal analog modem
MI
Internet communication via internal ISDN modem
MG
Internet communication via GPRS
Power Supply
AC
100-240 V AC / 47-63 Hz
DC
24 V stabilised
Sensor connection
D
Direct connection of sensors
Number of Paths
1
Firmware
01
Standard firmware Clamp On
NIM-
M3W
D
1
01
1-2 paths, max. 2 paths
Fig. 4-4
NivuSonic CO transmitter type keys
Summary of Contents for NivuSonic Clamp On
Page 109: ...18 Declaration of Conformity...
Page 110: ......
