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Summary of Contents for Emerson Micro Motion 820
- Page 1 Installation Manual MMI-20035532, Rev AA June 2017 Micro Motion ™ 820 Electronics...
- Page 2 Emerson employees. If you fail to follow Emerson procedures, then Emerson will not accept your returned equipment. Return procedures and forms are available on our web support site at Emerson.com/global, or by calling the Micro Motion Customer Service department.
- Page 3 Chapter 3 Mounting............................9 3.1 Provide for maintenance accessibility..................9 3.2 Mount the 820 electronics......................9 Chapter 4 Wiring............................11 4.1 Prepare the cable between the sensor and the 820.............11 4.2 Wire the 820 to the sensor....................... 12 Chapter 5 Grounding..........................19 5.1 Ground the 820..........................19 www.Emerson.com...
- Page 4 Contents Installation Manual June 2017 MMI-20035532 www.Emerson.com...
- Page 5 Length and conductor diameter of the power cable must be sized to provide 18 VDC minimum at the power terminals, at a load current of 0.2 amps. Cable sizing formula M = 18V + (R x L x 0.2A) • M: minimum supply voltage • R: cable resistance • L: cable length www.Emerson.com...
- Page 6 Wire gauge Resistance 14 AWG 0.0050 Ω/ft 16 AWG 0.0080 Ω/ft 18 AWG 0.0128 Ω/ft 20 AWG 0.0204 Ω/ft 2.5 mm 0.0136 Ω/m 1.5 mm 0.0228 Ω/m 1.0 mm 0.0340 Ω/m 0.75 mm 0.0460 Ω/m 0.50 mm 0.0680 Ω/m www.Emerson.com...
- Page 7 A. Sensor 1 with junction box B. Sensor 2 with junction box C. 9-wire cable D. 9-wire cable E. 820 F. User-supplied RS-485 cable G. User-supplied power cable H. Power supply I. Remote host J. Hazardous area K. Safe area www.Emerson.com...
- Page 8 Architecture Installation Manual June 2017 MMI-20035532 www.Emerson.com...
- Page 9 3.2 Mount the 820 electronics Procedure Attach the device to an instrument pole or wall. For a pipe mount, two user-supplied U- bolts are required. Contact Micro Motion to obtain a pipe-mount installation kit if required. Figure 3-1: Pipe mount www.Emerson.com...
- Page 10 Mounting Installation Manual June 2017 MMI-20035532 Figure 3-2: Wall mount www.Emerson.com...
- Page 11 Static (no load) Under dynamic load condition 0.39 in (10 mm) 3.15 in (80 mm) 6.26 in (159 mm) Table 4-2: Bend radii of shielded cable Jacket material Outside diameter Minimum bend radii Static (no load) Under dynamic load condition 0.55 in (14 mm) 4.25 in (108 mm) 8.5 in (216 mm) www.Emerson.com...
- Page 12 Wire the 820 to the sensor 4.2.1 Wire the 820 to the sensor using jacketed cable Prerequisites For hazardous area installations, install the jacketed cable inside a user-supplied sealed metallic conduit that provides 360° termination shielding for the enclosed cable. www.Emerson.com...
- Page 13 Table 4-3: Terminal designations Wire color Function Black Drain wires Brown Drive + Drive – Orange Temperature – Yellow Temperature return Green Left pickoff + Blue Right pickoff + Violet Temperature + Gray Right pickoff – White Left pickoff – www.Emerson.com...
- Page 14 Install drip legs in conduit and cable, if necessary. Inspect and grease all gaskets and O-rings. Fully close and tighten all housing covers and conduit openings. Procedure 1. Identify the components of the cable gland and cable. www.Emerson.com...
- Page 15 8. Use a 1 in (25 mm) wrench to tighten the sealing nut and compression nut between 20 ft lbf (27 N m) to 25 ft lbf (34 N m) of torque. www.Emerson.com...
- Page 16 Table 4-4: Terminal designations Wire color Function Black Drain wires Brown Drive + Drive – Orange Temperature – Yellow Temperature return Green Left pickoff + Blue Right pickoff + Violet Temperature + Gray Right pickoff – White Left pickoff – www.Emerson.com...
- Page 17 Figure 4-6: 820 terminals A. Sensor 1 B. Sensor 2 b) Tighten the screws to hold the wires in place. c) Ensure integrity of gaskets, grease all O-rings, then replace the device housing cover and tighten all screws, as required. www.Emerson.com...
- Page 18 Wiring Installation Manual June 2017 MMI-20035532 www.Emerson.com...
- Page 19 (unless required by local code). • If the joints in the pipeline are not grounded, connect a ground wire to the internal or external grounding screw located on the 820. A. Internal grounding screws B. External grounding screw www.Emerson.com...
- Page 20 For more information: Emerson.com/global © 2017 Micro Motion, Inc. All rights reserved. The Emerson logo is a trademark and service mark of Emerson Electric Co. Micro Motion, ELITE, ProLink, MVD and MVD Direct Connect marks are marks of one of the Emerson Automation Solutions family of companies.
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