Model 3241-D Asphalt Content Gauge

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.

Troxler's Model 3241-D Asphalt Content Gauge enables you to quickly, accurately, and safely test your bituminous mixes for asphalt content using nuclear methods.

Used by transportation agencies all around the world, the Model 3241-D provides accurate asphalt content results in as little as five minutes, and it adheres to ASTM Standard Test Method D-4125.


Precision @ 6% Asphalt
Sample Count Time
1 min.
4 min.
8 min.
16 min.
7000 gram (3241-C)
7000 gram (3241-D)
7000 gram (3241-D II)
Neutron Source - 3241-C 100 ±10 mCi (3.7 ± 0.37 GBq) Am-241:Be

Neutron Source - 3241-D

80 ± 8 mCi (3.0 ± 0.3 GBq) Am-241:Be 
(contains two 40 mCi {1.48 GBq} sealed sources)

Source Form Stainless Steel Encapsulation, Special Form
Shielding Polyethylene and Cadmium
Shipping Case DOT 7A, Type A
Power Source 110/220 VAC, 50/60 Hz; 12 V vehicle battery or 
Alkaline Batteries (D Cell)
Power Consumption

1 Watt (nominal)

Baud Rate Range 300 - 2400 baud
Test Data Storage Up to 99 tests
Calibration Storage Up to 64 calibrations
Interface RS-242C for transfer to printer or computer
Length 14.25 in. (36.2 cm)
Width 11.00 in. (27.9 cm)
Height 10.50 in. (26.7 cm)
Weight 30 lbs. (13.62 kg)
Operational Temperature 0 to 140°F (-18 to 60°C)
Sample Temperature 0 to 350°F (-18 to 177°C)
Mechanical (Control Unit)
Length 8.62 in (21.9 cm)
Width 11.00 in. (27.9 cm)
Height 3.60 in. (9.2 cm)
Weight 2.75 lbs. (1.25 kg)
Operational Temperature 0 to 140°F (-18 to 60°C)
Sample Temperature 0 to 350°F (-18 to 177°C)

Supplied with:

  • Four stainless steel pans.
  • Four Helium3 thermal neutron detectors.
  • Hardshell case for transport.


The Model 3241-D provides these features and benefits:

  • Asphalt content measurement without the hazard and expense of the toxic chemicals employed in the solvent extraction method 
  • Rapid measurement allows mix inputs to be altered so the project stays within specifications.
  • Calibration transfer from a centrally located gauge greatly reduces calibration time for field sites.
  • The Universal Sample System option provides the added convenience of measuring either the commonly used 4" or 6" laboratory compacted sample
  • Send data directly to a printer or computer
  • A twelve-month warranty and fifty years of Troxler experience give you the confidence you deserve
Product Resources
Model 3241-D Sell Sheet


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