Technical Instructions
QVE1901U Flow Switch
Document Number 155-711
September 20, 2012
Page 4
Siemens Industry, Inc.
Line Size 3/4-inch to
8 inches
(20 mm to 200 mm)
Nut size 27
external thread
1/2-14 NPT
Welding adapter with
female 1/2-14
NPT,
adapter length 1’’
thread
3.15 - 0.79
(8
0) - (
2
0)
SEN0533R1
40
30
20
15
9
50
60
70
80
Figure 4.
Installation Notes
•
Observe all local regulations from the electrical utilities or waterworks as applicable.
Electrical
Connections
WARNING:
Danger of death due to electrical voltage!
Always disconnect power to the system before connecting wires of the main
cable.
CAUTION: Destruction or damage of reed contact!
Note the maximum contact loads stated on the type plate.
The maximum contact loads stated on the type plate (switching voltage,
switching current, and switching capacity) refer to pure ohmic loads and may
not be exceeded under any circumstances.
High voltage and current peaks can occur, particularly when switching
inductive or capacitive loads (for example, relay coil, capacitors). Even a brief
overload can destroy (welding the contacts) or damage (reduced lifespan)
the reed contact.
