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Safety Grounding
The safety grounding requirements are determined by the application and the connected
instruments. The Pointek CLS500 transmitter does not have any special requirements due
to the galvanic separation between the measurement section and the loop section.
Depending on the DCS characteristics, there are three possible grounding options:
•
If the DCS measures the current through the loop compared to a common zero Volt
point, do not ground the negative side of the current loop because measurement
inputs can be short-circuited.
•
If the DCS measures the current in the positive wire or connector, the negative side
of the current loop can be grounded.
•
If the DCS has galvanically separated inputs for each measurement channel the
grounding method can be chosen as required.
In hazardous applications a Stahl-type barrier is required, and it is typically mounted on a
DIN rail inside a customer-supplied enclosure located in the non-hazardous area.
Example 1
If no specific Ex conditions apply, Pointek CLS500 can be directly connected to the DCS.
The supply voltage, however, should remain within the limits set by the Pointek CLS500.
Connecting a Pointek CLS500 to a DCS does not influence that equipment. One of the
connection cables can be grounded if desired.
Type:
Ser.:
Date:
Rev.:
Tampering voids warranty
GND
COAX
7ML19985GG03
3,6 - 22 mA
13 < Vsupp < 32 Vdc.
Pointek CLS500 – INSTRUCTION MANUAL
DCS APPARATUS
Page 37
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