Conair GB - Manual (Page 58)

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TH AND TL (change only if material sticks in the weigh bin)
TH and TL are acceptable error limits for TARE WEIGHT.
Before a dispense cycle begins, the software checks to see that the
weigh bin is in place and that it is not already full of material. To
do this it looks at the starting TARE weight.
If Tare weight is below the value of TL, (50 grams), the software
assumes that the bin is either missing or hung up on something. In
this case the ALARM sounds.
If Tare weight is above the value of TH (100 grams), the software
assumes material is in the bin. In this case the ALARM sounds and the
weight bin dump flap operates in an attempt to empty the weigh bin.
If you are processing a material that has a tendency to hang up in the
corners of the bin, then you may wish to widen the range of acceptable
starting tare weight. Since tare weight is always subtracted from
dispense weights, these errors do not effect accuracy.
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PRT (change to get AUTOMATIC printing of material totals)
PRT, when set to any number other then zero, will cause the
processor to output all current material usage totals, at regular time
intervals, to the printer port. The number you enter will dictate the
time interval in MINUTES. All timing starts from MIDNIGHT. for
example, an entry of 00120 will cause totals to print at 2 AM, 4 AM, 6
AM, etc. Printing always waits until a cycle has just ended. A
setting of 10000 is a special case. This will cause a printout after
every cycle. A printer must be connected. If one is not, the routine
will abort and blending will continue.
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DLY (consider changing if mixing is a problem)
DLY is the TIME the mix chamber level sensor must be uncovered
before a cycle begins. The sensor must be uncovered without
interruption for the full specified DELAY time. To prevent false
starts from material movement caused by the mix blade, a minimum of 2
seconds (00488) is recommended.
Sometimes throughput is slow enough that each new batch buries the
mix blade for a while. When this happens the material on top does not
mix well. To reduce this, you can delay the start of a new batch by
increasing the DLY parameter. The new batch is delayed and mix chamber
level has time to fall before the next batch is added.
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PRC (no change required)
PRC is the maximum allowable PERCENT rate change per cycle. If a
large dispense error occurs, flow rate corrections do not exceed this
percent number. This prevents large swings in timing of dispenses and
provides for stable dispense rates under difficult conditions. For
example, when dispense quantities are very small (one or two grams),
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