KROHNE OPTIBAR P 3050 C EN - Manual (Page 22)

4
ELECTRICAL CONNECTIONS
22
OPTIBAR P 3050 C
www.krohne.com 03/2012 - 4001953401 - MA OPTIBAR P3050C R02 en
4.4 Grounding the measuring device
• The pressure sensor must be properly grounded.
• When using an intrinsically safe or grounded feed unit, do not connect PE!
• Do not use the grounding cable to connect any other electrical devices to ground at the same
time.
• The pressure transmitter is connected to ground by means of a functional grounding
conductor.
• In hazardous areas, grounding is used at the same time for equipotential bonding.
A ground terminal is provided on the outside of the housing to accommodate wire widths of up to
1.5 mm
2 .
4.5 Description of the current output
The current output is a 2-wire 4...20 mA output.
Overload condition:
• Lower limit: 3.8 mA
• Upper limit: 20.5 mA
Alarm current:
• Low alarm current: 3.6 mA
• High alarm current: 21 mA
Standard setting: High alarm current
The transmitter works with voltages of 12...45 VDC, no load.
R
Load
[KΩ] = (U
B
[V] - 12 V) / alarm current max. [mA]
where U
B
= supply voltage and R
Load
= max. load resistance (load)
DANGER!
There should be no difference in potential between the pressure sensor and the housing or
protective earth of the transmitter!
Figure 4-5: Position of the ground terminal on the housing
1 Ground terminal
.book Page 22 Thursday, March 8, 2012 9:29 AM