KROHNE OPTIBAR DP 7060 C EN - Manual (Page 30)

4
ELECTRICAL CONNECTIONS
30
OPTIBAR DP 7060 C
www.krohne.com 04/2014 - 4003292001 - MA OPTIBAR DP 7060 C R01 en
4.2.1 Requirements for signal cables provided by the customer
If the signal cable was not ordered, it is to be provided by the customer. The following
requirements regarding the electrical specifications of the signal cable must be observed:
Specifications for standard signal cables
• Test voltage: ≥ 500 VAC RMS (750 VDC)
• Temperature range: -40...+105°C / -40...+221°F
• Capacity: ≤ 200 pF/m / 61 pF/ft
• Inductance: ≤ 0.7 µH/m / 0.2 µH/ft
• Use cable with round cross section.
• A cable outer diameter of 5…9 mm / 0.2 … 0.35" ensures the seal effect of the cable gland. If
you are using cable with a different diameter or cross-section, exchange the seal or use a
suitable cable gland.
• We generally recommend the use of a shielded cable for HART ® multidrop mode.
4.2.2 Laying electrical cables correctly
1 Lay the cable in a loop just before the housing.
2 Tighten the screw connection of the cable entry securely.
3 Never mount the housing with the cable entries facing upwards.
4 Seal cable entries that are not needed with a plug.
Figure 4-1: Protect housing from dust and water
.book Page 30 Friday, May 2, 2014 10:25 AM