Electromagnetic Flowmeter
WaterMaster 4 Electrical Installation
28 IM/WM Issue 7
4.7 Power Supply Connections
4.7.1 AC Power Supply
Warning.
Electrical installation and earthing (grounding) must be in accordance with relevant national and
local standards.
Power must be connected via a suitable isolator and fused in accordance with relevant standards.
When changing fuses F1 or F2, isolate the power supply and wait 20 s before opening the
enclosure.
Replace fuses with the correct part, see Fig 4.17 (AC power) and 4.18, page 29 (DC power).
Fig. 4.17 AC Power Supply Connections
N/L2
L/L1
L/L1 N/L2 PE
Transmitter Label
External Earth Screw
AC power via a
suitable isolator
and fuse
*AC Fuse F1 250 mA Type T
(see table below for suppliers)
>4 mm
2
(<10 AWG) Copper Wire
Power Supply Indicator LED
**Can be used as a
Protective Earth (PE)
if required by
national standards
Brown
Blue
Green/Yellow
Internal Earth
Screws**
Fuse Supplier Fuse Part Number
ABB B20411
Bussmann BK/ETF 250 mA
Wickmann 19372 K250mA
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