3
1.5 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.
NOTE
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.
NOTE
Do not install sealing compound until all
field wiring is completed.
CAUTION
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.
6. Explosion proof installation must be in accordance
with Drawing Number 1400160 (see Figure 1-5).
5. For sensors in hazardous area locations, explosion
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.
1.6 HAZARD LOCATIONS - INTRINSICALLY SAFE
INSTALLATIONS. See Figure 1-4. To secure and
maintain intrinsically safe installations for the appro-
priate approval agency, the following conditions must
be met:
1. Code 67 must be specified when ordering F.M.
(Factory Mutual) units. Approved “Entity”
installation must be in accordance with
Drawing Number 1400161 (see Figure 1-6 and
Figure 1-7).
2. Code 69 must be specified when ordering
C.S.A. (Canadian Standards Association) units.
Installation must be in accordance with Drawing
Number 1400162 (see Figure 1-8).
MODEL 2081 pH SECTION 1.0
INSTALLATION
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