Emerson Rosemount 644 Reference Manual page 3

CAUTION
Conduit/cable entries
The conduit/cable entries in the transmitter housing use a ½–14 NPT thread form.
When installing in a hazardous location, use only appropriately listed or Ex certified plugs, glands, or adapters in cable/conduit
entries.
Unless otherwise marked, the conduit/cable entries in the housing enclosure use a ½–14 NPT form. Only use plugs, adapters,
glands, or conduit with a compatible thread form when closing these entries.
Unless marked, the conduit/cable entries in the transmitter housing use a ½–14 NPT thread form. Entries marked "M20" are
M20 × 1.5 thread form. On devices with multiple conduit entries, all entries will have the same thread form. Only use plugs,
adapters, glands, or conduit with a compatible thread form when closing these entries.
Only use plugs, adapters, glands, or conduit with a compatible thread form when closing these entries.
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