Section IV. Monitor DisplayIV. Monitor DisplayA.Measurements1.Bargraph Format (Fig. 5)Measurements are displayed on the screen, one per line, with the label or identifier on the left side ofthe screen, a scale with a bar representing the magnitude of the data in the middle of the screen, and adigital readout on the right. Marcon's format for displaying information has many advantages overother types of formats. The labeling to the left of the bar will clearly identify what that measurement is.The bar format, which can be read by comparing the length of the bar with the scaling above it, can bescanned quickly, and makes it easy to compare readings. The numbers to the right of the bar givesexact measurement readings.2.Bar SymbolsThere are two symbols types which may be displayed on the bar, setpoint markers and referencemarkers. Setpoint markers are represented by large white triangles pointing to the left or right.Markers pointing to the right are low level alarm setpoints, and markers pointing to the left are highlevel alarm setpoints. Measurements crossing these markers are alarms, and will be annunciated.The other marker, a small, white, inverted triangle, is a reference marker. it may be used by theoperator to mark normal operating levels or to check for changing readings. Setting of the referencemarker is covered in paragraph VI. D. 6. b. of this manual.3.Bar MessagesThere are a number of messages which may be displayed in place of the bar. These messages, whichindicate special situations, are;DEACTIVATEDThis message indicates that the sensor has been deactivated, or 'turned off'.OVERRANGEThis message is displayed when the data received from that sensor is of greater value than thescale displayed on the page. it is the equivalent of the needle on a gauge being pegged at thetop end.UNDERRANGEThis message is displayed for rate measurements, and some level measurements. it means thatthe reading is too low to measure accurately.UNIT NOT OPERATINGThis message is displayed to inform the operator that the alarm setpoint on this bar is not activebecause the unit being monitored is not on, and the alarm would not be meaningful. Thismessage may still be displayedPMS II Operator's InstructionsPage 7
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