Hazardous Locations-Explosion Proof Installations; Hazardous Locations-Lntrinsically Safe Installations - Emerson Rosemount 1181pH TRANSMITTER Instruction Manual

MODEL 1181 pH/ORP
2.4 HAZARDOUS LOCATIONS-EXPLOSION PROOF
INSTALLATIONS. In order to maintain the explosion
proof rating for installed transmitter, the following con-
ditions must be met.
1. The transmitter enclosure covers must be on hand
tight and the threads must not be damaged.
These covers seat on rings which serve to
provide a dust proof enclosure for Class II
and Class III installations.
2. Explosion proof "Y" fittings must be properly
installed and plugged with a sealing compound to
prevent explosive gases from entering the trans-
mitter. CSA has determined that the transmitter
housing is "Factory Sealed". Installation of "Y" fit-
tings and the use of sealing compound is not
required for CSA approved Explosion Proof instal-
lations.
Do not install sealing compound until all
field wiring is completed.
Sealing compound must be installed prior
to applying power to the transmitter.
3. If one of the conduit connections on the housing is
not used, it must be closed with a threaded metal
plug with at least five threads engaged.
4. The serial tag cover on the external ZERO and
SPAN adjustments must be in place.
NOTE
NOTE
CAUTION
6. Explosion proof installation must be in accordance
with Drawing Number 1400155 (see Figure 2-12).
5. For sensors in hazardous area locations, explo-
sion proof junction boxes can be provided to
house the preamplifier. This does not warrant the
pH or ORP sensor explosion-proof. Maximum
safety can be achieved by installing an intrinsically
safe system where Hazardous Area requirements
must be met.
2.5 HAZARD LOCATIONS - INTRINSICALLY SAFE
INSTALLATIONS. To secure and maintain intrinsically
safe installations for the appropriate approval agency,
the following conditions must be met:
1. Code 73 must be specified when ordering CEN-
ELEC/BASEEFA units. Installation must be per-
formed in accordance with Drawing Number
1400143 (see Figures 2-5, 6 & 7).
2. Code 69 must be specified when ordering C.S.A.
(Canadian Standards
Installation must be in accordance with Drawing
Number 1400123 (see Figure 2-8).
3. Code 67 must be specified when ordering F.M.
(Factory Mutual) units. Approved "Entity" installa-
tion must be in accordance with Drawing Number
1400153 (see Figures 2-9, 2-10, and 2-11).
SECTION 2.0
INSTALLATION
Association) units.
7