5–6
Burn Time
Different asphalt mixes may require different burn times, depending
upon the sample %AC and the sample mass. The optimum burn
time can be determined by preparing a test sample of known %AC.
The test sample should closely represent the production mixture.
Burn the test sample until it is clean (free of coke, the solid binder
residue).
NOTE
Using the Auto-Control with cutoff limit of 0.01% or
0.1 g will accomplish a clean burn test sample.
Use the time required to produce a clean test sample as the burn
time. Refer to Table 5-1, which lists the minimum recommended
burn times for selected sample masses.
To program the burn time manually, press
〈
2
〉
at the
Burn
Parameter Menu
shown on page 5–4. The oven requests the burn
time between 15 and 720 minutes. Use the numeric keys to set the
burn time. To move the cursor back one position, press the
〈
BACK
SPACE
〉
key. When finished, press
〈
ENTER
〉
. The oven sets the
new burn time, displays a brief confirmation message, and returns to
the
Burn Parameter Menu
.
NOTE
The oven will not store burn data for burn times greater
than 120 minutes. Burn data storage is available only for
burn times of 120 minutes or less.
Table 5-1. Recommended Minimum Burn Times
Minimum Burn Time* (min)
Sample
Mass (g)
120 V Unit
240 V Unit
1200 25 20
2000 35 30
3000 55 50
Summary of Contents for NTO 4730
Page 10: ...x LIST OF TABLES Table Title Page 4 1 Oven Keys 4 3 5 1 Recommended Minimum Burn Times 5 6...
Page 30: ...2 10 NOTES...
Page 90: ...5 36 NOTES...
Page 110: ...6 20 NOTES...
Page 136: ...Appendix A 16 NOTES...
Page 148: ...Appendix C 6 NOTES...
Page 156: ...Index 8 NOTES...
