Install the LCD


Warning: While you can perform this modification for either CSI 9420 devices that are certified as intrinsically safe, for non-rated CSI 9420 devices that carry no hazardous area certification, or for CSI 9420 devices that are certified as non-incendiary (e.g. Class I, Div 2 or Zone 2 rated), only an Emerson Product Service Center personnel should remove and reinstall the LCD . Failure to do so may void the hazardous location certification.

Figure 1. Installing the LCD


  1. Remove the LCD cover.

    The front electronics end cap (the cap covering the LCD) is certified for Class I, Division I in appropriate gas environments (check the nameplate on the device for details).

    Exposing the electronics to a production environment may allow particulates, moisture, and other airborne chemicals to enter into the device, which could lead to contamination and potential product performance issues.

  2. Insert the four-pin connector into the interface board, rotate the LCD to the correct position, and snap the LCD in place.

    If the LCD pins are inadvertently removed from the interface board, carefully re-insert the pins before snapping the LCD in place.

    After installation, you can remove the LCD by squeezing the two tabs and pulling gently. You can then rotate it in 90-degree increments and snap it back in place.

  3. Attach the LCD cover.
    Use a strapping wrench to tighten the cover until it will no longer turn and the black O-ring is no longer visible.

    Figure 2. Sealing the end cap

    1. Improperly sealed end cap. Black O-ring is still visible.
    2. Properly sealed end cap. Black O-ring is no longer visible.

    Important: Moving one LCD around to multiple devices, on an “as need” basis, is NOT recommended. This can cause reliability problems over time. The connector pins on the LCD are not designed for repeated connect/disconnect.