HDI 2522, User Manual

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HDI 2522 Position Indicator Gauge
IECEX/ATEX User’s Manual – HDI 2522, Rev A | November,2019
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4.B Gauge Head Features
As shown in the above figure, the gauge system has several distinctive features and functions that
this manual will explain in following subsections. The buttons (M,  ,  ,E) and On/Off are part of
the membrane panel and are discussed below.
4.C Engineering Units Display
See Section 2.D for the list of applicable engineering units.
4.D Main Display
The main display in normal run mode displays the measured percentage in numerical format. The main
display is also used for other features such as calibration and serial number identification.
4.E Bar Graph Display
In all operating modes in which the bar graph is active the bar graph display will indicate the relative
resistance as a percentage of full scale. The bar graph display consists of 100 segments and gives the
user a graphical representation of the main display.
4.F Membrane Panel
The membrane panel is a momentary contact switch. This panel is used for operations such as
calibrating the unit, to set low and high calibration reference points, set and identify the related serial
number on the unit, and other applicable functions.
4.G Power Off / On Button
The power ON/OFF button is located on the bottom center of the membrane panel and is a momentary
contact switch. The power On/Off button is used to turn on or off the gauge. If the gauge is off, pressing
and releasing the button will turn the gauge on.
4.H Mode (M) Button Calibration Only
The Mode ( M ) Button is used to cycle through the different operating modes of the gauge system In
normal run mode.