Rosemount 2081 pH, Instruction Manual

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1.1 UNPACKING AND INSPECTION. Inspect the
transmitter for shipping damage. If damaged, notify
the carrier immediately. Confirm that all items shown
on the packing list are present. Notify Rosemount
Analytical if items are missing. If the transmitter
appears to be in satisfactory condition proceed to
Section 1.2.
NOTE
Save the original packing cartons and
materials as most carriers require proof of
damage due to mishandling.
1.2 MECHANICAL INSTALLATION.
1.2.1 General. The transmitter may be installed in
harsh environments. However, it should be installed in
an area where sources of extreme temperature fluctu-
ation, vibration and shock are at a minimum or absent.
Select an installation site that (1) permits the use of the
standard cable lengths (unless a J-box is used), (2) is
easily accessed by operating and maintenance per-
sonnel, and (3) is at least 12 inches (.3 m) from
sources of high voltage.
1.2.2 Mounting. The transmitter may be mounted on
a flat surface using the two threaded mounting holes
located on the bottom of the transmitter or through the
use of an optional 2-inch pipe/wall mounting bracket,
Code 07 (
Figure 1-1 ).
NOTE
The meter may be installed in 90-degree incre-
ments for easy viewing. Remove the four screws
holding the meter in place and change the
meter to the desired angle. Plug in the display
and tighten the four screws.
1.3 WIRING. The transmitter is equipped with two 1/2-
inch NPT conduit openings, one on each side of the
housing. One is for the power supply/signal wiring and
the other is for the sensor wiring.
To prevent moisture from entering the housing, the use
of weathertight cable glands or conduit is recom-
mended. If conduit is used, it should be positioned to
prevent condensation from draining into the housing.
Conduit connections on the transmitter housing should
be plugged and sealed to avoid moisture accumulation
in the terminal side of the housing.
CAUTION
If the connections are not sealed, the
transmitter should be mounted with the
electrical housing positioned downward
for drainage. Wiring should be installed
with a drip loop, and the bottom of the drip
loop should be lower than the conduit con-
nections or the transmitter housing.
The signal wiring should be twisted pairs for best
results. The twisted pairs should also be shielded and
grounded. The best place to ground the loop is at the
negative terminal of the power supply. Do not ground
the signal loop in more than one point. The transmitter
case shall be grounded.
Signal or sensor wiring should never be run in the
same conduit or open tray as AC power or relay actu-
ated signal cables. Keep signal or sensor wiring at
least 12 in. (.3 m) from heavy electrical equipment.
NOTE
For best EMI/RFI protection the output cable
should be shielded and enclosed in an earth
grounded rigid metal conduit. Connect the
cable’s outer shield to the ground terminal
provided next to TB2,
Figure 1-1 .
The sensor cable should also be shielded.
Connect this outer shield to earth ground as in
the instructions above. If the outer shield is
braided an appropriate metal cable gland fit-
ting may be used to connect the outer braid to
earth groud via the instrument case.
1
SECTION 1.0 INSTALLATION
MODEL 2081 pH SECTION 1.0
INSTALLATION