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4640-B Surface Thin Layer Density Gauge

    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.

    Gauge Precision ±1 std. deviation at 2240 kg/m3 [140 pcf])

    Time (minutes)
    2.5 cm (1")
    5.0 cm (2")
    6.3 cm (2.5")
    2.5 cm (1")
    5.0 cm (2")
    6.3 cm (2.5")
    Depth of Measurement 25-100 mm (1-4 inches)
    Accuracy of Density Standards ±0.3%
    Calibration Range 100-170 pcf (1600-2700 kg/m3) Density
    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
    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

    4x16 alpha-numeric LCD

    Case Coloured polycarbonate top shell with aluminium 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 


    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