Nivus NivuFlow 750, Инструкция по эксплуатации

Страница: 40 / 162

Instruction Manual
NivuFlow Mobile 750
page 40 NFM 750 - rev. 03 / 27.05.2020
25.2.2 Connection of Flow Velocity Sensors using the Adapter Box
By using an Adapter Box ( NFM0 ZAB2 VKK ) up to three flow velocity sensors (3-path-
measurement) as well as the level sensors mentioned in chap. “25.2.1 Connecting Sensors
directly to NivuFlow Mobile” can be connected to the NivuFlow Mobile 750.
In such a case, two of three v-sensors are connected to the Adapter Box (Fig. 25-4) and the
third sensor is connected directly to the NivuFlow Mobile 750 transmitter as shown in Fig.
25-1 through socket v1. An i-Series/NivuBar Plus level sensor is connected to the Multi I/O
socket as depicted in Fig. 25-3.
Fig. 25-4 Connecting two flow velocity sensors via the Adapter Box
25.3 Overvoltage Protection Measures
To protect NivuFlow Mobile effectively if operated from external power supply it is necessary
to protect the unit by using overvoltage protection equipment.
WARNING
Danger of explosion when operated with direct connection in Ex area
Operate the unit only out of Ex areas using direct mains connection (e.g. mains plug
adapter) or direct external power supply (e.g. solar power).
Never do so within Ex areas.
If used with mains plug adapter , NIVUS recommend the types EnerPro 220Tr / 20kA or
EnerPro 220Tr / 5kA (Fig. 25-5) in the mains side.
For direct external power supply using 12 V DC (e.g. solar power) the type DataPro 2x1
12V/12V-11
µ
H-Tr(N) for non-Ex (Fig. 25-6) is recommended.

See chapter “55 Accessories”.
Fig. 25-5 General overvoltage protection for AC power supply
Fig. 25-6 General overvoltage protection for DC power supply