Compur 4120 operation manual Example of cable specifications, Sensor head connection procedure

Compur Statox 4120

Example of cable specifications:
Max. cable capacity:	l x CL = Co - Ci	= 107 nF
Max. cable inductivity:	l x LL = Lo - Li	= 6,6 mH
Diameter:	> 0,75 mm2

The Statox 4120 Systems will work reliably if the electrical resistance is : RL < 50 Ω. Most commonly the maximum length is limited by the cable capacity.

Example: Cable diameter is 1,0 mm2 (0,04 in), CL = 90 pF/m, LL = 0.7mH/km, RL / km = 19,5 Ω. The maximum cable length results to be

l = Co − Ci = 1189 m (3900 ft), the electrical resistance is

90 pF / m

RL = 2 x 1.189km (0,738 miles) x 19,5 Ω/km = 46,4Ω. So RL < 50Ω is OK.

Sensor head connection procedure:

Open sensor head, remove cable gland.

Connect signal cable to terminals X3/1 und X3/2, polarity does not matter. (DIN EN 60079-14 chapter 12 is applicable)

Fasten cable gland.

Connect battery pack: - Blue to terminal X4/1

-Orange to terminal X4/2

-Red to terminal X4/3

Connect signal cable to backplane of the rack. (See chapter 3.2)

pic.9: Sensor head pcb terminals

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