TM 5-3895-374-10............................................................................................................................................... Description of USER OPTIONSLines 1 and 2 define options applied to the aggregate scale conveyors. The alternative options are "measured by scale" or"measured by volume". The preferred mode, and possibly the only mode allowed by the governing quality control agency,is "by scale". This mode proportions the liquid A/C according to the weighed aggregate rate as measured by the aggregatescale. If the scale becomes inoperative, and if the operator is confident that the volumetric feeder calibrations areaccurate, and if the operator is certain that these feeders are reliable and consistent in operation he may elect to ignore thescale and proportion the A/C according to the "aggregate measured by volume". Even in the "by volume" mode, thecomputer keeps track of the exact time sequence of events. The only difference in the entire process control is that insteadof measuring a scale value the computer calculates and uses the desired target aggregate value that corresponds in timewith the actual aggregate crossing the weigh scale.NOTE:Do not use this backup mode of operation unless you fully understand the factors that can affect mixquality when proportioned volumetrically.Line 3 defines the method by which the A/C temperature is acquired. The preferred mode of operation is "A/C temperatureis measured by probe’’. In this mode the A/C temperature is automatically measured and may be used to continuouslytemperature compensate the asphalt meter. If the temperature sensing probe or circuitry becomes inoperative the usershould elect to change to "A/C temperature is entered byuser"at which point he will be allowed to enter the observed A/Ctank temperature manually on the Material Parameters Display (option (3>).If the asphalt meter is temperaturecompensated by the computer, this manually entered value will be used to effect the compensation. In the "entered byuser"mode the A/C temperature display and printout will be shown in parenthesis to show the operator that the value is notmeasured but is entered by the user.Line 4 defines the method by which the total asphalt in the mix is calculated. The most common method is to calculatesuch that "A/C blend is a % of total mix. Total mix includes virgin aggregate, recycle, any other additives andtheaddedA/C.The alternate method of calculation is as "a % of total aqqreqate". Aggregate includes all the components of total mixexcept it does NOTinclude the added A/C. Therefore:by mix:%mA/C = (+A/C)x 100Virgin + Rap + Additives + (+A/C)by agg:%aA/C = (+A/C)x 100Virgin + Rap + Additivespage F - 102SYSTEMS Equipment Corp. 8/31/89 Page (54)
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