24 Model 3700 Transmitters or Model 3350 Peripherals - Field Mount
Wiring
4. Ensure the integrity of the gaskets, grease all O-rings, then close the junction box
housing and core processor end-cap, and tighten all screws.
3.4 Connect the power supply wiring
Connect the Model 3350 or Model 3700 to a power supply using the following steps:
1. Acquire a 18 to 12 AWG (0,75 to 4,0 mm
2
) wire.
2. Using a flat-head screwdriver, loosen the captive screws that secure the display cover
to the housing.
3. Ground the transmitter as follows:
a. Connect the ground wire to the green power supply ground screw. See Figure 3-1.
b. Connect the power supply ground wire directly to earth ground.
c. Keep all ground leads as short as possible.
d. Ground wiring must have less than 1 ohm impedance.
4. Connect wires to terminals 9 and 10 on the gray terminal block. See Figure 3-1 and
Figure 3-2.
5. Close the display cover and tighten the screws.
6. (Optional). Install a user-supplied switch in the power supply line.
In Europe, install the switch close to the Model 3350 or Model 3700 in order to comply
with low-voltage directive 2006/95/EC. For details, see standard EN 61010-1:2010
clause 5.4.3.d.
Cable type Procedure
Jacketed cable Ground the shield drain wires (the black wire) only on the
core processor end, by connecting it to the ground screw
inside the lower conduit ring. Do not ground to the core
processor’s mounting screw. Do not ground the cable at the
sensor junction box.
Shielded or armored cable Ground the shield drain wires (the black wire) only on the
core processor end, by connecting it to the ground screw
inside the lower conduit ring. Do not ground to the core
processor’s mounting screw. Do not ground the cable at the
sensor junction box.
Ground the cable braid on both ends, by terminating it inside
the cable glands.
CAUTION!
Make sure that the wires are not caught or pinched when you close the housing to reduce the
risk of measurement error or meter failure.
CAUTION!
• Do not install power supply wiring in the same cable tray or conduit as the input/output
wiring to avoid device failure or measurement error.
• Shut off the power supply before installing the applications platform.
• Make sure the power supply voltage matches the voltage that is indicated on the power
supply wiring terminals. See Figure 3-2.
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