Troxler - 4640-B Surface Thin Layer Density Gauge

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Products / Field Equipment / Nuclear Surface Gauges / 4640-B Surface Thin Layer Density Gauge

4640-B Surface Thin Layer Density Gauge

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Field Equipment

Asphalt Plant Equipment
- Moisture Measurement System
  - MMS Model 3630 for Asphalt Plants

Lab Equipment

Accessories
- Other Accessories

About Troxler Products

Troxler Electronic Laboratories, Inc. is a world leader in the manufacturing of testing/quality control measurement equipment for the construction industry. We are recognized worldwide as the industry standard for Nuclear Moisture/Density Gauges. In addition to nuclear gauges, Troxler is also a leader in the production of Gyratory Compactors and Asphalt Ignition Ovens. Troxler continues to set new product standards of quality and precision in the construction industry. For a complete list of Troxler equipment, please review this Products section.

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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

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	4x16 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