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General • Inspections

Penetrometer Apparatus Calibration

Penetrometer Apparatus Calibration involves verifying and adjusting the device to ensure accurate measurements of soil strength and consistency. This process enhances the reliability of geotechnical data, supports precise engineering decisions, and ensures compliance with industry standards. Regular calibration minimizes errors and extends the lifespan of the equipment.
AA - Roanoke
03/24/2025

Penetrometer Apparatus Calibration

Penetrometer Apparatus Calibration involves verifying and adjusting the device to ensure accurate measurements of soil strength and consistency. This process enhances the reliability of geotechnical data, supports precise engineering decisions, and ensures compliance with industry standards. Regular calibration minimizes errors and extends the lifespan of the equipment.

    Scale S/N

    Timer S/N

    Results

    Procedure E-250/ASTM D5/AASHTO T49

    Dial accurate to 0.1mm

    • Pass
    • Flag
    • Fail

    Spindle readily detaches

    • Pass
    • Flag
    • Fail

    Mass of Spindle: 47.45 to 47.55 g

    Mass of 50 g weight: 49.95 to 50.05 g

    Mass of 100 g weight: 99.95 to 100.05 g

    Needle moves vertically and perpendicular to flat base

    • Yes
    • No
    • N / A

    Device equipped with leveling indicator

    • Yes
    • No
    • N / A

    Level indicator verified with handheld level

    • Yes
    • No
    • N / A

    Automatic timer accurate to 5 seconds (+/- 0.1 second). Record the elapsed time

    Dial reading for 0.0625 in (1.5 mm) gauge block: 15 +/- 1 dmm

    Dial reading for 0.2 in (5.08 mm) gauge block: 50.8 +/- 1 dmm

    Dial reading for 0.5 in (12.7 mm) gauge block: 127 +/- 1 dmm

    Dial reading for 1.0 in (25.4 mm) gauge block: 254 +/- 1 dmm

    Maintenance Items

    Clean entire unit and make sure base is free of asphalt

    • Yes
    • No
    • N / A

    Clean weights making sure they are free of asphalt prior to weight verification

    • Yes
    • No
    • N / A

    Assure plunger moves freely when clutch is depressed. Clean and lube as necessary

    • Yes
    • No
    • N / A

    Action Recommended

    Comments

Source: AA - Roanoke (Community Member)

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