Humboldt HS-5001SD Nuclear Gauge

Features of the SD Gauge


SD Gauge

Humboldt’s NEW HS-5001SD Moisture/Density Gauge provides more efficient operation, data collection and processing than any other gauge in its class. Using state-of-the-art technology, the HS‑5001SD brings you a host of new features aimed at making your job easier. Featuring a 4.3" touch-screen, the SD Gauge provides intuitive operation of all gauge operations. It also provides touch pad operation as an alternative control method. The SD’s versatility allows it to measure density through direct transmission and backscatter modes, as well as thin lift, trench modes and moisture determinations.

The gauge uses an advanced micro-processor-based technology to provide highly-accurate measurements of density and moisture that are automatically computed for direct readouts of wet density, dry density, moisture content, percent of moisture, percent of compaction (Proctor or Marshall), void ratio and air voids. The SD Gauge complies with all pertinent standards: ASTM D6938, D2950, C1040 and AASHTO T310 and is calibrated by the Five-block calibration method.

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Touch-Screen or Touch Pad—

You have your choice with the Humboldt HS-5001SD Moisture/Density Gauge. The gauge features a 4.3" touch-screen, which provides complete control or you can also use the menu-driven touch pad.

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WiFi Enabled—

The SD gauge can connect to your PC for downloading test results via wireless technology. No more cables and gauges on your desk. Our wireless function provides a reliable and secure connection up to 30 feet.

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Easy to Power—

The SD Touchscreen Gauge is powered by a rechargeable NiMH battery, which provides up to 60 hrs. of runtime. In addition, the gauge can also be powered by six standard AA alkaline batteries. Car charger available.

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USB Port—

The SD gauge also has a USB slot, which provides a convenient way to capture test data and take it with you, as well as provide an easy way to upgrade the gauge’s firmware. Firmware upgrades will be available via the internet from our website.

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Equipped with GPS, the SD gauges’ location is used for testing purposes so you know where each Test was performed.

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Easy Self Repairs—

The SD Gauge’s modular design enables it to be serviced in the field by you, if necessary. No need to send the gauge in for repair, we’ll send you the necessary components and walk you through many of the repair procedures.




Operating Temperature: 14 to 158°F (-10 to 70°C) ambient, 347°F (175°C) Material Surface
Storage Temperature: -70 to 185°F (-55 to 85°C)
Humidity: 98% without condensation, Rain-Resistant Construction
Vibration: 0.1" (2.5mm) at 12.5 Hz
Shielding: Tungsten Powder Alloy
Source Rod: 440C Stainless steel, Induction, heat treated to 55 Rockwell C
Gauge Base: Computer-Machined 6061-T6 Aluminum, Hard-Coated and PTFE Impregnated
Post and Frame: Computer-Machined 6061-T6 Aluminum, Anodized for Anti-corrosion
Index Rod: 7075 aluminum, Hard Coated and PTFE Impregnated
Top Shell: Injection-Molded Noryl with Integral Color
Bearing: Relieved Bronze with Neoprene Seals
Screws/Fittings: Stainless Steel and Brass


Measurement: Density at 125 pcf (2000 kg/m3)

Direct Transmission, 6" (150mm) 15 seconds (Fast) 1 minute (Std.) 4 minutes (Slow)
Precision, pcf (kg/m3) ±0.5 (8) ±0.25 (4) ±0.13 (2)
Chemical Error, pcf (kg/m3) ±1.0 (16) ±1.0 (16) ±1.0 (16)
Surface Error, pcf (kg/m3) -0.5 (8) -0.5 (8) -0.5 (8)
Measurement Depth: 2 to 12" (50 to 300mm)
Backscatter, 3.5" (88mm) 15 seconds (Fast) 1 minute (Std.) 4 minutes (Slow)
Precision, pcf (kg/m3) ±1.0 (16) ±0.5 (8) ±0.25 (4)
Chemical Error, pcf (kg/m3) ±2.5 (40) ±2.5 (40) ±2.5 (40)
Surface Error, pcf (kg/m3) -3.0 (48) -3.0 (48) -3.0 (48)
Measurement Depth: 3.5" (88mm)
Moisture at 10pcf (160kg/m3) 15 seconds (Fast) 1 minute (Std.) 4 minutes (Slow)
Precision, pcf (kg/m3) ±0.5 (8) ±0.25 (4) ±0.13 (2)
Surface Error, pcf (kg/m3) -0.25 (4) -0.25 (4) -0.25 (4)
Measurement Depth: 4-8" (100 to 200mm)



Dimensions (base): 15.75" x 8.66" x 5.5" (400 x 220 x 140mm)
Handle Height: 18" or 21.5" (450 or 550mm)
Weight: 30 lbs (13.6kg)
Reference Standard:
Dimensions: 13.8" x 7.8" x 3" (350 x 200 x 75mm)
Weight: 10 lbs (4.5kg)
Transit Case:
Dimensions: 31" x 14" x 19.5" (787 x 356 x 495mm)
Weight: 31 lbs (11.8kg)
Accessory Case (loaded):
Dimensions: 19.7" x 9.8" x 5" (500 x 250 x 125mm)
Weight: 16 lbs (7.3kg)
Total Shipping Weight: 90 lbs (41kg)


Radioactive Materials Data Needed for License Application

Material Chemical/Physical Form Maximum Amount
Cesium-137 Sealed Source Humboldt 2200064 Not to exceed 11 millicuries per source
Americium-241:Be Sealed Source Humboldt 2200067 Not to exceed 44 millicuries per source



Display: TFT, color LCD with back-light, 16:9, 480 x 272 pixel
Timer Stability: 0.01%
Power Supply Stability: 0.10%
Power Source: NiMH battery (AA battery optional)
Power Consumption: Active—110mA — Battery Life—60 hours runtime
Power Protection: Main Batteries—Circuit Breaker Regulated Supplies—Short Circuit Proof
Low Battery Condition: LOBAT Alarm and Auto Shutoff for low and dead battery conditions
Battery Life Remaining Battery Life Automatically Estimated at Power-up by activating TEST routine



Gamma Source
Material, Type and Amount: Cs-137, 370MBq (10mCi)
Special Form Registration: USA/0356/S-96 Rev 12
ANSI and ISO Class: ANSI 77C66535
Neutron Source
Material, Type and Amount: Am-241: Be, 1.48GBq (40mCi)
Neutron Yield: 70 Knps ±10%
Special Form Registration: CZ/1009/S-96 Rev 1
ANSI and ISO Class: ANSI 77C66545
Type: Sealed Source, Special Form
Housing: Stainless Steel, Double Encapsulated
Surface Dose Rates 18.7 mrem/hr Maximum (Neutron and Gamma)
Transit (shipping) Case DOT 7A, Type A, Yellow II Label, O.2 TI