Advice On Safety - KROHNE BM 70 A Installation And Operating Instructions Manual

4.1 Replacement of power fuse(s)
Location of fuses: see drawings below. Use only the specified types.
4.2 Changeover of operating voltage (AC Version only)
Through a different orientation of the voltage selector switch on the "line" board you can switch over
between 115 V AC (85-127V) and 230 V AC (170-254V). For this purpose, pull the plug next to the
fuse holders up and out (see drawing below), turn it 180° and plug it back into the holder. Also change
the two fuses F2 and F3 to suit the selected voltage.
Do not forget to alter the voltage information on the signal converter nameplate and in the terminal
compartment!
4.3 Changeover between 1 fuse (TN system) and 2 fuses (IT system) (AC-Version only)
Plug the blue wire on the "line" board into the desired position "TN" or "IT". Do not forget to alter the
information TN or IT on the signal converter nameplate ("field power").
5. Reassemble in reverse order, Points 3-1.
Important: Ensure that the screw thread of cover DE on the electronic compartment is well greased at
all times.
Power supply unit 115/230 V AC
Signal output 24V -5V +5V
light-emitting diodes for
voltage control
voltage
selector
fuse F2
230V
115V
fuse F3
L IT TN
isolated system (IT):
brown blue
grounded system (TN):
brown

9.4 Advice on safety

Insulation rating
The insulation of type BM 70 A/P level gauges is rated in conformity with VDE 0110/01.89, equivalent
to IEC 664, and takes into account the following ratings:
·
Overvoltage category for the power line circuit: III
·
Overvoltage category for the output circuit: II
·
Insulation contamination level: 2 (inside the device)
Disconnecting device, miniature fuse
Type BM 70 A/P level gauges do not feature any device for switching or disconnection.
Class of protection
The BM 70 A/P level gauge is designed for Safety Class 1 in conformity with VDE 0106 Part 1.
Installation and operating instructions BM 70 A/P
Power supply unit 24 V DCAC
230V: T 160mA
115V: T 315mA
blue
-5V
light-emitting diodes for
+5V
voltage control
24V
signal
output
Fuses
F3 F4
brown blue
Page: 64
T 1.25A
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