FB1100 Flow Computer Instruction Manual
D301752X012
November 2023
Introduction 5
Explosion-proof Enclosure
The FB1100 Flow Computer includes an explosion-proof enclosure made of either
aluminum or stainless steel. The enclosure consists of the main housing, two threaded
covers, and four conduit entry points.
The four conduit entry points are ¾ in NPT pipe threaded holes that permit entry of field
conduit for I/O and communication wiring. ATEX installations use a ¾ in NPT to M20
thread reducer. Unused apertures shall be closed with suitable blanking elements.
The FB1100 Flow Computer can operate in an unprotected outdoor environment. Wiring
for I/O, communications, and power enters the enclosure through the four conduit
fittings with appropriate protective seals and connects to the terminal plate.
The front end cap (cover) provides a viewing window for the HMI module. You can access
the terminal plate by removing the rear end cap (cover).
The FB1100 Flow Computer has North American certification for Class I Division 1 Groups
C and D (explosion proof) and Class I Division 2 Groups A, B, C and D (non-incendive)
hazardous locations or non-hazardous locations.
The FB1100 Flow Computer has European certification for Ex db Zone 1 (flame-proof) and
Ex ec Zone 2 (non-sparking) hazardous locations or non-hazardous locations.
See CD9434 - UL Safety Instructions for FB1100 Flow Computers for more information on
certifications.
See the data plate screwed to the top of the enclosure to see which certifications apply to
your flow computer.
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