Emerson Rosemount 2120 Manual Supplement
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Emerson Rosemount 2120 Manual Supplement

Replacement and calibration of rosemount 2120 electronic cassettes
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Manual Supplement
00809-0200-4030, Rev BA
November 2012
Replacement and Calibration of
Rosemount 2120 Electronic Cassettes
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Summary of Contents for Emerson Rosemount 2120

  • Page 1 Manual Supplement 00809-0200-4030, Rev BA November 2012 Replacement and Calibration of Rosemount 2120 Electronic Cassettes...
  • Page 2 Manuals are available electronically on www.rosemount.com. Failure to follow these installation guidelines could result in death or serious injury The Rosemount 2120 is a liquid level switch. It must be installed, connected, commissioned,  operated, and maintained by suitably qualified personnel only, observing any national and...

  • Page 3: Replacement And Calibration Of Electronic Cassettes

    To replace the cassette, do the following: 1. Isolate and disconnect the power to the Rosemount 2120, and insulate the ends of the wires. On a 2120 with a relay cassette, there may be more than one power source.
  • Page 4 November 2012 Manual Supplement Figure 2. Mode switch and setting on the existing cassette This is an example of how the existing cassette may look. Dry On Wet On Here, the switch is set to “Dry On” with a one second delay. Take note of the actual setting.

  • Page 5: Calibration Sequence

    Manual Supplement November 2012 Calibration sequence This section describes what is required for calibration. Calibration sequence steps 3 to 13 are time dependent and must be carried out within the noted times. The purpose of the time dependency and switching sequence is to prevent an accidental calibration from occurring.
  • Page 6 November 2012 Manual Supplement Figure 4. Magnetic test point (metal housing) MAGNET NO MAGNET (OUTPUT OFF) (OUTPUT ON) (OUTPUT OFF) (OUTPUT ON) Figure 5. Magnetic test point (glass-filled nylon housing) DIRECT LOAD SWITCHING DIRECT LOAD SWITCHING MAGNETIC MAGNETIC TEST TEST Supply 20 - 264Vac Supply...

  • Page 7: Electrical Installation

    Manual Supplement November 2012 Electrical installation Before use, check that suitable cable glands and blanking plugs are fitted and fully tightened. Isolate supply before connecting the switch or removing the electronics. The Protective Earth (PE) terminal must be connected to an external earthing system.
  • Page 8 November 2012 Manual Supplement PNP/PLC electronics cassette (three-wire, yellow label) PLC/PNP OPERATION MODE Dry On Mode Dry On Wet On Isolate Supply Before Removing Wet On Mode Seconds Delay ) = 0 - 500 mA U = 20 - 60 V (dc) I <...
  • Page 9 Manual Supplement November 2012 Relay output electronics cassette (DPCO, green label) OPERATION MODE Warning Isolate Supply Before Removing Seconds Delay Dry On Dry On Wet On Wet On Fuse 0.5 (T) (Ground) Resistive Load Inductive Load cos φ = 1 ; cos φ...
  • Page 10 Note This cassette is suitable for Intrinsically Safe applications and requires a certified  isolating barrier. See the Rosemount 2120 Reference Manual ( 00809-0100-4030) for Intrinsically Safe approvals This electronics cassette is also suitable for non-hazardous (safe) area applications.
  • Page 11 Note This cassette is suitable for Intrinsically Safe applications and requires a certified  isolating barrier. See the Rosemount 2120 Reference Manual ( 00809-0100-4030) for Intrinsically Safe approvals This cassette is also suitable for non-hazardous (safe) area applications. It can only be ...

  • Page 12: Troubleshooting

    Suppress the cause of the interference switching Cassette has been fitted from another Fit the factory supplied cassette (page Rosemount 2120 and then calibrate (page LED indication When the LED is red and flashing, it indicates the 2120 may be uncalibrated, successfully calibrated, has an electrical load problem, or has an internal PCB fault.
  • Page 13 Manual Supplement November 2012...
  • Page 14 November 2012 Manual Supplement...
  • Page 15 Manual Supplement November 2012...
  • Page 16 © 2012 Rosemount Inc. All rights reserved. All marks property of owner. Instrument Co., Limited The Emerson logo is a trade mark and service mark of Emerson Electric Co No. 6 North Street, Hepingli, Rosemount and the Rosemount logotype are registered trademarks of Rosemount Inc.

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