3-20 | Thermox TM 2000 Oxygen Analyzer
EMC grounding, shielding, and noise protection
For EMC purposes, under no circumstances should you leave shields
disconnected at one end or both ends of the cable (sensor or control
unit or other device).
You must use twisted-pair cable in rigid metal conduit or use twisted-pair
cable with an overall braided shield. All cable shields or conduits connect-
ing to the control unit must be chassis-grounded.
EMC Grounding Method
•
Shield Ring Method
Connect all shields for that conduit entry (other than power) to a sup-
plied shield terminal ring (see Figure 3-18). This shield ring is a stain-
less steel ring with a metal tab. Place the shield ring under the conduit
nut. Crimp the shields from all cables for that conduit entry to a 1/4”
female quick disconnect, then push it onto the tab that sticks out of
the conduit shield ring. Keep shields as short as possible.
• Ground Stud Method
Connect all cable shields for that conduit entry to the grounding stud
closest to that conduit entry hole.
Ground Stud Method
Shield Ring Method
Figure 3-18.
Direct shield
grounding methods.
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