10
Wiring
Step 4 Wiring
Hazardous area installations
If you are installing the sensor in a hazardous location, verify that the hazardous classification information
printed on the sensor tag matches the environment in which the sensor will be installed.
Failure to comply with the requirements for intrinsic safety in a hazardous area could result in an
explosion. Make sure the hazardous area specified on the sensor approval tag is suitable for the
environment in which the sensor will be installed.
Improperly sealed housings can expose electronics to moisture, which can cause measurement error
or flowmeter failure. Inspect and grease all gaskets and O-rings. Fully close and tighten all housing
covers and conduit openings.
Installation options
The sensor has one of the following configurations:
• An integrally mounted Model 1700/2700 transmitter. No wiring is required between the sensor and the
transmitter. Skip to Grounding on page14.
• A core processor to a 4-wire remote transmitter (requires 4-wire cable); see Core processor to a 4-wire
remote transmitter on page10.
• A core processor to a remote host (requires 4-wire cable); refer to the Micro Motion MVD™ Direct
Connect™ Flowmeter Installation Manual.
• A junction box to a 9-wire remote transmitter or remote core processor (requires 9-wire cable); see
Junction box to a 9-wire remote transmitter or remote core processor on page 13.
Core processor to a 4-wire remote transmitter
Follow the steps below to connect the 4-wire cable between the core processor and the transmitter.
1. Use one of the following methods to shield the wiring from the core processor to the transmitter:
• If you are installing unshielded wiring in continuous metallic conduit that provides 360°
termination shielding for the enclosed wiring, go to page 12 (step 6 of the wiring procedure).
• If you are installing a user-supplied cable gland with shielded cable or armored cable, terminate
the shields in the cable gland. Terminate both the armored braid and the shield drain wires in the
cable gland. Never connect the drain wires to the internal ground screw of the core processor. Go
to page 12 (step 6 of the wiring procedure).
• If you are installing a Micro Motion-supplied cable gland at the core processor housing:
- Prepare the cable and apply shielded heat shrink as described below. The shielded heat shrink
provides a shield termination suitable for use in the gland when using cable whose shield
consists of foil and not a braid. Proceed to step 2 of the wiring procedure, below.
- With armored cable, where the shield consists of braid, prepare the cable as described below,
but do not apply heat shrink. Proceed to step 2 of the wiring procedure, below.
2. Remove the cover from the core processor housing.
3. Slide the gland nut and the clamping insert over the cable.