Electronics International CGR-30P - Manual (Page 17)

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If the EGT for a cylinder exceeds the pilot set High EGT Range,
the bar for that cylinder will turn white and blink. This feature
provides the pilot with a warning of a high EGT. The FAA does
not allow exceedance of user set EGTs to display in red or
yellow.
If the CHT for a cylinder exceeds the set limit, the bar for that
cylinder will turn red and blink.
The current Digital Display Mode of operation is designated in
the top right portion of the Engine Analyzer display. The
selections are Select, Diff, Scan and Hottest. The Digital Display
Mode controls what will be displayed in the digital section at the
bottom of the Bar Graph display.
Select Mode: The Select Mode allows the pilot to select a cylinder (displayed with a box around the
cylinder number). The EGT and CHT for the cylinder selected are shown in the bottom portion of the
display.
Diff Mode: The Diff Mode displays the difference between the hottest and coldest EGT and CHT.
The values are displayed at the bottom of the Bar Graph and are designated by EGT-D and CHT-D
If a differential limit is exceeded, the digital values will be displayed in white. The differential limits are
set in the “EGT/CHT Bar Graph Setup” screen (see section 6). The differential limits allow the CGR
to detect developing engine problems before they become expensive repair bills.
Scan Mode: The Scan Mode automatically scans through all of the cylinders. As it scans through the
cylinders, the EGT and CHT numeric values are displayed in the bottom portion of the Bar Graph
display. The scan rate can be set in the “EGT/CHT Bar Graph Setup” screen.
Hottest Mode: The Hottest Mode displays the hottest EGT and CHT in the digital display below
the bars. This is the favorite mode of operation for most pilots.
2.5.2 “Normalized” Operating Mode: The Normalized Mode of operation is an engine diagnostic tool
that allows comparison of the current EGTs and CHTs to a reference (past flight). By normalizing the EGTs
and CHTs the vertical bars are brought to the same level, creating a reference baseline.
The EGT and CHT bars may be normalized (leveled) at any time by pushing and holding the Select Knob
for four seconds and following the instruction in the pop-up window.
The offset data to level the bars is stored in CGR permanent memory. The Normalized Mode allows
changes that have occurred in the engine to be spotted easily. This makes it possible to detect trends over
several flights, days, weeks, and even years.