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CI-9110 2-5 Installation
using a flat metal bar or similar tool. When replacing the cover, it should be snugged in and
not over-tightened. The threads of the cover should also be coated with a layer of anti-seize
compound to prevent lockup.
When the cover is removed, the PC board assemblies become accessible (see right view of
Figure 2-3). The Termination Board contains the field wiring terminals while the CPU
Board contains the option switches. The gear mechanism and feedback potentiometer are
also accessible.
2.4.2 Electrical Conduit Port
Two 3/4 in. NPT electrical ports are provided at the lower part of the housing. Either or
both ports may be used to bring in signal and supply wiring (left of Figure 2-3). These ports
accommodate a standard 3/4 inch NPT pipe thread connection. If a port is not used, it must
have a conduit plug installed to maintain the explosion-proof integrity of the unit.
2.5 INSTALLATION IN HAZARDOUS LOCATIONS
Instruments that operate in hazardous locations must adhere to the following rules of
safety:
A. All instrument wiring that runs through a hazardous area must be enclosed in metal
conduit. The point where the conduit connection meets the unit's housing should be
properly tightened to prevent entry of gas or other ignitable substances. Explosion-proof
wiring practices must be followed to prevent flashback through the conduit.
B. The cover of the installed unit must be screwed in hand tight and fully seated. The cover
must not be damaged and no threads should be stripped.
C. The cover of the unit must never be removed during operation unless the atmosphere is
made safe or all electrical power is removed from the instrument.
** Warning **
No maintenance procedures should be performed while the
unit is powered and operating in a combustible or
explosive environment. If on-site maintenance is a
necessity, steps must be taken to make the environment
safe (non-hazardous). Otherwise, the instrument must be
powered down, unwired, and brought into a safe area. A
failure to observe these precautions could result in fire or
explosion and injury to persons.
** Safety Note **
For certified instruments, all installation and operating
practices must conform to area classification and safety
codes as specified by the certifying laboratory. The seal of
the certifying laboratory will appear on the instrument
data plate along with the model and serial number.