product manual H-2790, H-2791, H-2792 H-2790_91_92_man_1009 Hi-Low Detector
General Information The Hi-Low Detector is a device used for detecting and marking the points on a roadway surface that deviates from the desired level of grade. It is a precision-made straightedge, for checking both concrete and blacktop slabs. Basically, the machine consists of an I-beam body 10 to 16 feet long with riding wheels at the ends and a detector wheel at the middle, so that the machine can be steered on the surface.
Adjusting & Checking Accuracy 1. Quickly check for accuracy by hooking the spring-loaded line underneath the wheels as shown in Figure 1. 2. To set the indicator wheel exactly on the line, loosen the wing nut at point “A” and turn screw “A” upward until the wheel is right on the line. With the wheel in this position, the indicator needle should read zero. If it does not, release lock nut “B” and turn rod at “C” up or down until a zero reading is obtained.
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.
