ELECTRICAL CONNECTIONS
3
51
OPTIFLEX X200
www.krohne.com
09/2018 - 4006564001 - AD IECEX OPTIFLEX x200 R01 en
3.9 Ex ic nA equipment
3.9.1 How to connect the electrical cables
If you connect electrical wires to the terminals in the terminal compartment, use approved cable
glands (M20×1.5 or
½
NPT). The cable glands must have a test certificate that agrees with
IEC 60079-7 or IEC 60079-15. Obey the instructions given on the test certificates. Make sure that
the tightening capacity of the cable gland is applicable to the diameter of the electrical wire.
Make sure that the tightening capacity of the cable gland is applicable to the diameter of the
electrical wire.
Obey the instructions that follow:
•
Use the electrical connection procedure in the handbook.
•
The electrical wiring must agree with the applicable standards (e.g. IEC 60079-14).
•
Do not remove more than 6 mm / 0.2
¨
•
Put the electrical wires in position and safely attach them to prevent damage. The electrical
wires must also be a sufficient distance from hot surfaces.
•
Make sure that the device is connected to a PELV (protective extra-low voltage) circuit.
•
Make sure that unused electrical wires and shields are safely connected to the ground
potential of the hazardous area. If this is not possible, make sure that each of the unused
electrical wires are safely isolated (other electrical wires, ground etc.) and rated for a test
voltage
≥
1500 V
RMS
.
•
If it is necessary, make sure that the electrical wire insulation gives good protection from
corrosion.
Remote (Field) version
Remote (Field) version
Remote (Field) version
Remote (Field) version
The signal cable (between the converter electronics and the probe electronics) is supplied by the
manufacturer for IECEx applications. The signal cable cannot be changed by the user. For more
data, speak to the supplier.
DANGER!
If you must open the electronics block compartment to remove electronics blocks for servicing,
de-energize the device. It is not necessary to disconnect the wires from the terminal. If you must
open the terminal compartment to remove the terminal block for servicing, deenergize the
device first.
WARNING!
Use only Ex nA or Ex ec-approved cable glands and adaptors.
INFORMATION!
Cable glands are supplied on customer demand. If you supply the cable glands, this part must
have a degree of ingress protection IP
≥
54 (IEC 60529). We recommend that you use a part that
has a degree of ingress protection IP
≥
67. Make sure that the cable gland is sealed.
