TM 5-3895-374-10
options . . utilities .................................................................................................................................. CALIBRATION display
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The Calibration menu subscreen is shown in Figure 86.0. Note that this screen overlays the previous menu with the
continuation options allowed for calibration and system configuration tasks.
Some process control systems are calibrated with screwdriver, voltmeter, and stopwatch and leave the operator with no
certain knowledge of the exact settings for current or previous calibrations. This computer is calibrated through the keypad
so that all calibrations are numeric values that can be printed and kept for reference. Consistency of values from
calibration to calibration indicate system stability. Unauthorized changes to calibrations can quickly and certainly be
determined by comparison with the printed and dated calibration record. For most cases, the entire computer could be
replaced and after installing the ’old’ calibration values would be in tolerance.
The Continuation Options are:
OPTION
KEY
DESCRIPTION
ESCape
ESC
Return to the previous display.
Alarm Limits
2
Display the screen containing the user selected alarm tolerances and the time for a
continuous out of tolerance condition to cause plant shutdown. From this screen all
values can be edited.
Time Delays
3
Display the screen containing the user measured process timing intervals. Each
time interval is the time required for a material to reach the point of liquid asphalt
addition as measured from the point at which the material is controlled. From this
screen all values can be edited.
Meters
5
Display the screen containing the zero and span calibration values for all ’meters’.
From this screen all values can be edited. From this screen
various
computer
assisted calibration procedures can be selected.
Feeder Rates
8
Display the screen containing the span calibration values for the feeders. From this
screen all values can be edited. From this screen
various
computer
assisted
calibration procedures can be selected.
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SYSTEMS Equipment Corp. 8/31/89Page (29)
