KROHNE OPTIBAR P 2010 C Ex EN - Manual (Page 9)

ELECTRICAL CONNECTIONS
4
9
OPTIBAR P 1010/2010 C
www.krohne.com 01/2014 - 4002866801 - AD OPTIBAR PX010 Ex R01en
4.1 General notes
Overvoltage protection
If the pressure transducer is being used as category 1 G equipment, a suitable overvoltage
protection device must be installed upstream (see Industrial Safety Regulations [BetrSichV]
formerly Technical Regulations for Flammable Liquids [TRbF100] and EN 60079-14).
Circuits
The circuits are designed in protection type "intrinsically safe".
The connecting cables should be selected according to the applicable installation standards (e.g.
EN 60079-14) and the maximum operating temperature. Ensure that no residual current can
form between separate intrinsically safe signal circuits.
• The connecting cables must be fixed and laid so they are sufficiently protected against
damage.
• Devices with plugs are to be mounted in that way that protection degree IP20 is maintained.
• All cores that are not used must be securely connected to the ground potential of the
hazardous area or carefully insulated against each other and against ground (test voltage ≥
500 V
eff
).
• Lay cables so as to ensure that there is sufficient distance between surfaces of the
measuring unit and the connecting cable.
• Supplied blind plugs / cable entries guarantee protection against foreign bodies and water
(protection category) IP66 / 67 according to EN 60529 in the temperature range
T
amb
= -40...+100°C / -40...+212°F.
• The outer diameter of the connecting cable must be within the sealing range of the cable
entry (8...13 mm / 0.31...0.51").
• Unused cable entries are to be closed (>IP66 / 67).
Ensure that all seals are tight.
4.2 Power supply
The pressure transmitter does not require a separate power supply. The required supply for the
built-in electronics is provided via the 4...20 mA current output.
4.3 Inputs/outputs
The terminal assignment of the built-in electrical equipment is described in the standard
documentation. The pressure transmitter signal circuits may only be connected to certified
intrinsically safe slave units or circuits. For more information refer to chapter "Electrical data".
4.4 Grounding and equipotential bonding
If the device is not sufficiently electrostatically grounded via the process cables, an additional
ground connection must be established using the ground terminal.
Any existing cable shields should be connected to ground according to applicable installation
regulations (EN 60079-14). A terminal connection in the terminal compartment permits a short
way grounding of the cable shields.