Installation
Issue 5 - June 2005 Page 26 of 64 Pages
Polytron SE Ex (Pellistor) measuring head
NOTE
Use cable with braided copper screen.
CAUTION!
Do not connect the sensor/measuring head when the controller is
powered: this will damage the sensor.
Maximum cable resistance
The maximum allowed cable resistance is 7 ohms per core with the Dräger SE Ex
sensor. This limits the cable length according to the cross-sectional area of the cable:
Cable x-section Maximum length
1.0 mm
2
300 m
1.5 mm
2
500 m
2.5 mm
2
850 m
4.0 mm
2
1200 m
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