© 2017 Baker Hughes, a GE company, LLC. All rights reserved.138 | BHGEOptional Display and PushbuttonsThe optional display and buttons are mounted on the SVI II AP cover plate. The threepushbutton switches operating in conjunction with the display permit reading andmodification of the instrument operating parameters without a PC or HART® hand-heldcommunicator. These switches perform generic functions - Increase, Decrease, and Accept bymovement through a conventional menu structure, see “Using the Digital Interfaces” onpage 69. The switches are operated in a hazardous environment without compromising theflameproof enclosure.SVI II AP Maintenance and RepairThe SVI II AP was designed based on a modular concept. All components are interchangeableallowing for easy, quick component swapping.The only maintenance procedures recommended for the SVI II AP are: Remove and install the cover, for upgrade to display Remove and install the I⁄P module Remove and install the Pneumatic RelayWARNING Do not remove the instrument cover or connect to an electricalcircuit in a Hazardous Area unless the power is disconnected.RepairReplacement of the Pneumatic Relay, I/P and cover (with or without display) are the only fieldrepairs permitted.Only qualified service personnel are permitted to make repairs.Only parts supplied by the factory are permitted. This includes not only the major assembliesbut also mounting screws and O-rings. No substitutions with non-Masoneilan parts arepermitted.
