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Mounting and sensor wiring for remote core processor with remote sensor installations 48 Micro Motion® Model 1700 and 2700 Mounting and sensor wiring for remote core processor with remote sensor installations Figure 5-3: Components of 4-wire remote mount transmitter (aluminum housing) A. End cap B. Cap screws C. Transmitter D. Mounting bracket Installation Manual Components of a 4-wire remote mount transmitter (stainless steel housing) Figure 5-4: A B D C A. End cap B. Cap screws C. Transmitter D. Mounting bracket 2. Attach the mounting bracket to an instrument pole. 5.2 Mount the remote core processor This procedure is required only for remote core processor with remote transmitter installations. Prerequisites For mounting the remote core processor to a wall: • Use four 5/16-inch diameter (or M8) bolts and nuts that can withstand the process environment. Micro Motion does not supply bolts or nuts (appropriate bolts and nuts are available as an option). • Ensure that the surface is flat and rigid, does not vibrate, or move excessively. For mounting the remote core processor to an instrument pole: • Use two 5/16-inch U-bolts for 2-inch pipe, and four matching nuts, that can withstand the process environment. Micro Motion does not supply U-bolts or nuts (appropriate bolts and nuts are available as an option). • Ensure the instrument pole extends at least 12 inches (305 mm) from a rigid base, and is no more than 2 inches (50.8 mm) in diameter. Mounting and sensor wiring for remote core processor with remote sensor installations 50 Micro Motion® Model 1700 and 2700 Mounting and sensor wiring for remote core processor with remote sensor installations Procedure 1. If desired, reorient the core processor housing on the bracket. a. Loosen each of the four cap screws (4 mm). b. Rotate the bracket so that the core processor is oriented as desired. c. Tighten the cap screws, torquing to 30 to 38 in-lbs (3 to 4 N-m). Figure 5-5: Components of a remote core processor AB A. Mounting bracket B. Cap screws 2. Attach the mounting bracket to an instrument pole or wall. Prepare the 4-wire cable Important For user-supplied cable glands, the gland must be capable of terminating the drain wires. Note If you are installing unshielded cable in continuous metallic conduit with 360. termination shielding, you only need to prepare the cable – you do not need to perform the shielding procedure. Installation Manual Mounting and sensor wiring for remote core processor with remote sensor installations Figure 5-6: 4-wire cable preparation Remove the core processor cover Cable glands Micro Motion cable gland Gland supplier Pass the wires through the gland nut and clamping insert. Clamping insert Gland nut Cable layout Metal conduit User-supplied cable gland Gland typeNPT M20 1. Strip 4-1/2 inch (115 mm) of cable jacket. 1. Strip 4-1/4 inch (108 mm) of cable jacket. 2. Remove the clear wrap and filler material. 2. Remove the clear wrap and filler material. 3. Strip all but 3/4 inch (19 mm) of shielding. 3. Strip all but 1/2 inch (12 mm) of shielding. Run conduit to sensor Lay cable in conduit Wrap the drain wires twice around the shield and cut off the excess drain wires. Drain wires wrapped around shield Go to the shielding procedure Pass the wires through the gland. Terminate the drain wires inside the gland. Done (do not perform the shielding procedure) Micro Motion® Model 1700 and 2700 Mounting and sensor wiring for remote core processor with remote sensor installations Figure 5-7: 4-wire cable shielding From the preparation procedure Assemble the Gland Apply the Heat Shrink 1. Slide the shielded heat shrink over the drain wires. Ensure that the wires are completely covered. 2. Apply heat (250 °F or 120 °C) to shrink the tubing. Do not burn the cable. 3. Position the clamping insert so the interior end is flush with the braid of the heat shrink. Cable shield type Braided (armored cable) Foil (shielded cable) Terminate the shield and drain wires in the gland Gland supplier Micro Motion cable gland User-supplied cable gland After heat applied Gland type M20 Trim 7 mm from the shielded heat shrink Shielded heat shrink Trim NPT 1. Fold the shield or braid back over the clamping insert and 1/8 inch (3 mm) past the O-ring. 2. Install the gland body into the conduit opening on the core processor housing. 3. Insert the wires through gland body and tighten the gland nut onto the gland body. Assemble the gland according to vendor instructions Shield folded back Gland body Done 5.3.1 4-wire cable types and usage Micro Motion offers two types of 4-wire cable: shielded and armored. Both types contain shield drain wires. The 4-wire cable supplied by Micro Motion consists of one pair of red and black 18 AWG (0.75 mm2) wires for the VDC connection, and one pair of white and green 22 AWG (0.35 mm2) wires for the RS-485 connection. User-supplied 4-wire cable must meet the following requirements: Installation Manual Mounting and sensor wiring for remote c...
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