05.
General The H-3220A Benkelman Beam Apparatus is a convenient and accurate device used for measuring the deflection of flexible pavements under moving wheel loads. Operating on a simple lever arm principal, the device consists of a reference beam body, two-part probe beam, and rear zero adjustment assembly. The dial indicator is not included and must be purchased separately. The Benkelman Beam has the following key features: • Lightweight aluminum construction for easy transport to test site locations.
Adjust the stop screw (#34), turning it in a clockwise direction, so the indicator does not bottom out when it’s in the up position. This point is reached when the indicator reading does not move while the operator is turning the stop screw. 4. After adjustment, turn the stop screw (Fig. 1, #34) in a clockwise direction, until approximately .004 of movement is registered on the indicator. Now tighten the lock nut against the frame.
Calculations The H-3220A series Benkelman Beam has a level ratio of 2:1, the H-3221HA Digital indicator has been calibrated to read the true deflection of the beam probe point, eliminating the need for any conversions. (For those using dial indicators: Pavement Reading = Maximum Reading minus Final Reading.) Indicator Models Available H-3221HA— Horizontal, Digital Indicator, 1-inch range, .001 accuracy H-3222— Vertical Dial Indicator, 1/2" range x 0.
17 18 16 21 19 15 22 23 24 25 26 57 27 28 20 29 56 31 55 39 54 41 14 30 32 33 Fig.
1 #10-32 x 1/2 Pan HD, Machine Screw 10 41 1/4" Spring Washer 1 2 #10-32 x 1/2 Pan SOC.
Warranty Humboldt Mfg. Co. warrants its products to be free from defects in material or workmanship. The exclusive remedy for this warranty is Humboldt Mfg. Co., factory replacement of any part or parts of such product, for the warranty of this product please refer to Humboldt Mfg. Co. catalog on Terms and Conditions of Sale. The purchaser is responsible for the transportation charges. Humboldt Mfg. Co.
