TMT162 Wiring
Endress+Hauser 13
4.5 Degree of protection
The device conforms to the requirements to NEMA 4X (IP 67) ingress protection. In order to fulfil
an NEMA 4X (IP 67) degree of protection after installation or service, the following points must be
taken into consideration (also see Fig. 8):
• The housing seals must be clean and undamaged before they are replaced in the sealing rebate. If
they are found to be too dry, they should be cleaned or even replaced.
• All housing screws and covers must be tightened.
• The cables used for connection must be of the correct specified outside diameter (e.g. M20 x 1.5,
cable diameter from 0.315 to 0.47 in; 8 to 12 mm).
• Tighten cable gland or NPT fitting.
• Loop the cable or conduit before placing into the entry ("Water sack"). This means that any
moisture that may form cannot enter the gland. Install the device so that the cable or conduit
entries are not facing upwards.
• Entries not used are to be blanked off using the blanking plates provided.
• The protective cable gland must not be removed from the NPT fitting.
Fig. 8: Connection hints to retain NEMA 4X (IP 67) protection
4.6 Connection check
After the electrical installation of the device, always perform the following final checks:
Device condition and specification Hint
Are the device or the cables damaged (visual check)? -
Electrical connection Hint
Is the cable/conduit installation correctly separated, with no loops or crossovers? -
Are the cables’ load relieved? -
Have the cables been correctly connected? Compare with the
connection schematic on the terminals or see Fig. 5.
See connection schematic on the
housing
Are all terminal screws tightened?
Is the cable or conduit entry sealed?
Is the housing cover screwed tight?
Visual check
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