4640-B Thin Layer Density Gauge
Product Features
Recognizing the need for an improved method of measuring the density of thin layer asphalt overlays, Troxler, the world leader in nuclear gauge technology, developed the first true thin layer density gauge, the Troxler Model 4640-B.
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 on-site 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.
Advantages of the MODEL 4640-B |
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ELIMINATES NEED FOR NOMOGRAPHS AND MANUAL CORRECTIONS : Variations in the density or composition of the base material do no affect the test results. No field calculations or charts are needed to determine density. OPERATOR SELECTED DEPTH OF MEASUREMENT : Enter the thickness of the overlay into the gauge memory and then accurately measure the overlay density (compaction) without influence from the underlying material. |
CALIBRATION : Test equipment is only as good as its calibration. With 30 years of proven experience, the 4640-B calibration process is unbeatable for its accuracy and results. For special materials, up to 11 field calibrations can be performed and stored. USER FRIENDLY : The operator will find the 4640-B very easy to use. It was designed as a user friendly gauge with prompts to guide the operator through the test procedure. DATA STORAGE - COMPUTER COMPATIBLE : Store up to 750 readings by location and project number. Transfer stored readings to a printer of computer via RS232 interface. Additional site information can also be stored with each test. |
Specifications
TECHNICAL SPECIFICATIONS |
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Measurement Specifications | |||||
Time (Min) | Thickness | kg/m3 | pcf | ||
Gauge
Precision (± std. deviation) at 2240 kg/m3 (140 pcf) |
1 4 |
2.5cm
(1") 5.0cm (2") 6.3cm (2.5") 2.5cm( 1") 5.0 cm (2") 6.3 cm (2.5") |
±16 ±10 ±8 ±8 ±5 ±4 |
±
1.0 ± 0.6 ±0.5 ±0.5 ±0.3 ±0.25 |
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Depth of Measurement | 25-100 (1-4) |
mm inches |
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Radiological Specifications | |||||
Gamma Source | 8 ± 1mCi Cesium-137 | ||||
Troxler Drawing Number | TEL A-102112 | ||||
Source Encapsulation | Stainless Steel | ||||
Shielding | Tungsten and lead | ||||
Surface Dose Rates | 5
mrem/hour max. top ad sides of gauge, 15 mrerm/hour max. bottom of gauge, gamma in shield position |
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Shipping Case | DOT 7A, TYPE A, Yellow II Label 0.2 Transport Index | ||||
Source Seal Approval for Domestic and International Shipment | Cs0137,
SPECIAL FORM Certificate GB: SFC 140 |
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Mechanical Specifications | |||||
Case | Colored polycarbonate top shell with aluminum cast base | ||||
Operating
Temp. : Ambient Surface |
-10
to 70º C (14 to 158ºF) 175ºC (350ºF) |
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Storage Temp. | -55 to 85ºC (-70 to 185ºF) | ||||
Gauge Size (excluding handles) | 472 x 231 x 158 mm (186 x 9.1 x 6.2 inches) | ||||
Gauge Weight (including handles) | 240 mm (9.5 inches) | ||||
Weight | 13.5 kg (29.7pounds) | ||||
Shipping Weight | 40.8 kg (90 pounds) with transport case | ||||
Electrical Specifications | |||||
Stored Energy | 30 watt-hours | ||||
Battery Recharge Time | 14-16 hours (automatic cutoff) | ||||
Battery Recharge | 110/220 V, 50-60Hz or 12-14 VDC | ||||
Power Consumption (avg.) | 0.16 watt/hours | ||||
Readout (LCD) LIQUID CRYSTAL DISPLAY | 4 x 16 alpha-numeric | ||||
Battery
packs are fully protected against overcharge and overdischarge. Provided with RS232 interface. Cable of operation with D size alkaline batteries for emergency use. |
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Calibration Specifications | |||||
Accuracy of Density Standards | ±0.3% | ||||
Calibration Range | 1600-2700
kg/m3 100-170 pct Density |
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Field
Data Conversion 4640-D - Contains a microprocessor providing direct reading in engineering units in pcf, kg/m3 or g/cm3 ; no calculation is required. |
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Special Functions | |||||
Automatic
standard count comparison and storage. Determination of count time for
selected precision. Field offsets of density. Field calibration for special asphalts. Calculator mode with storage. Self-test and service programs: Display, Keypad, and Ram Test; GM Tube Test; Statistical Stability and Drift Test; Gauge Identification Program. |
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Accessories | |||||
Supplied with the MODEL 4640-B : Air Gap Fixture. 1" Magnesium Block; AC
Battery Charger; DC Charger Cord; Transport case. Optional : PN 021140 Radiation Sign Kit; PN 102868 Leak Test Kit; PN 104262 Radiation Survey Meter; TLD Film Badge Service. |
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Licensing
and Training : The radioactive source contained in the 4640-B is a
by-product material and requires a special license issued by the "Agreement State" of by the U.S. Nuclear Regulatory Commission. Troxler will assist the customer in obtaining and completing the proper license application. Troxler office or field training may be arranged for a fee covering the instructor's time and expenses. For international licensing and training information, consult Troxler International, Ltd. or the local Troxler Distributor. |
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