4640-B Surface Thin Layer Density Gauge
Recognizing the need for an improved method of measuring the density of thin layer asphalt overlays, Troxler developed the first true thin layer density gauge, the 4640-B Surface Thin Layer Density Gauge.
Designed to measure the density of thin asphalt and concrete layers from 2.5 to 10 cm (1 – 4 inches), the Troxler Model 4640-B Thin Layer Density Gauge accurately measures the overlay density without influence from underlying material. No nomographs or manual corrections are required in order to compute the true density of the overlay. With onsite results available in as little as one minute, the Model 4640-B can provide the user with test results when they are needed, not hours after compaction has been completed.
Special Functions
- Automatic standard count comparison and storage
- Data storage of 750 records for later viewing, printing, and/or downloading
- Determination of the count time for selected precision
- Field offsets of density and a special calibration function
- Calculator mode
- Diagnostics and self-test modes
- Simple data transfer to a portable device using the free Troxler App
The Troxler Model 4640-B Thin Layer Density Gauge complies with ASTM D2950 and AASHTO T 355.
Specifications
| Measurement Gauge Precision ±1 std. deviation at 2240 kg/m3 [140 pcf]) |
|||
| Time (minutes) |
Thickness
|
kg/m3
|
pcf
|
|
1
|
2.5 cm (1″)
|
±16
|
±1.0
|
|
5.0 cm (2″)
|
±10
|
±0.6
|
|
|
6.3 cm (2.5″)
|
±8
|
±0.5
|
|
|
4
|
2.5 cm (1″)
|
±8
|
±0.5
|
|
5.0 cm (2″)
|
±5
|
±0.3
|
|
|
6.3 cm (2.5″)
|
±4
|
±0.25
|
|
| Depth of Measurement | 25-100 mm (1-4 inches) | ||
| Calibration | |||
| Accuracy of Density Standards | ±0.3% | ||
| Calibration Range | 100-170 pcf (1600-2700 kg/m3) Density | ||
| Radiological | |||
| Gamma Source | 8 ±1 mCi Cesium-137 | ||
| Troxler Drawing Number | TEL A-102112 | ||
| Source Housing | Stainless Steel Encapsulation (single or double) | ||
| Shielding | Tungsten and lead | ||
| Surface Dose Rates | 5 mrem/hr max. top and sides of gauge 15 mrem/hr max. bottom of gauge, gamma in shield position |
||
| Shipping Case | DOT 7A, Type A, Yellow II Label, 0.2 Transport Index | ||
| Sealed source approved for domestic and international shipment | CS-127, Special Form Certificate GB:SFC 140 |
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| Electrical | |||
| Stored Energy | 30 watt-hours | ||
| Battery Recharge Time | 14-16 hours (automatic cutoff) | ||
| Charge Source | 110/220 VAC, 50-60 Hz or 12-14 V DC | ||
| Power Consumption | 0.1t6 watt-hours | ||
| Readout | 4×16 alpha-numeric LCD | ||
| Mechanical | |||
| Case | Colored polycarbonate top shell with aluminum cast base | ||
| Operating Temperature | 32º to 122º F (0º to 50º C) | ||
| Gauge size without handles | 18.6 x 9.1 x 6.2 inches (472 x 231 x 158 mm) |
||
| Gauge height with handles | 9.5 inches (240 mm) | ||
| Storage Temperature | 0º to 140º F (-18º to +60º C) | ||
| Weight | 29.7 lbs. (13.5 kg) | ||
| Shipping Weight | 90 lbs. (40.8 kg) with case | ||
Options
- The Model 4640-B provides you with these advantages:
- True thin layer gauge – no nomograph calculations needed
- No need to measure the density of base materials
- Stores up to 750 test results
- twelve month warranty
