Humboldt H-2792 Hi-Low Detector - Manual (Page 3)

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. Then tighten nut
“B” and back off or lower screw “A” until the arm rests on lower stop “D”.
Figure 1
3. The Hi-Low Detector can be quickly checked for accuracy without using the
storage and transport frame by lowering the front and rear wheel guides. This
raises the wheels off of the ground so that the spring-loaded line can be stretched
underneath.
Specification
Frame Rectangular aluminum stock
Stands Front and rear; for storage, transport, and testing
Wheels Ground concentric with inside diameter of their ball bearings; neoprene
tires and adjustable scraper blades for accuracy; one front, one rear and
one center indicator wheel
Dye Bright orange; 12 oz. (340g) aerosol can; mounts beside indicator wheel;
contains no fluorocarbons; non-clogging
Handle For steering; with button for discharging dye
Scale Vertical; large pointer; mounted above indicator wheel;
magnifies variations 16X
Gradations 1mm
Readings
Magnified; range from 0 to ¼" (6.4mm), high or low
Weights H-2790: Net 70 lbs. (32kg); Shipping 140 lbs. (64kg)
H-2791: Net 80 lbs. (36kg); Shipping 160 lbs. (73kg)
H-2792: Net 102 lbs. (46kg); Shipping 200 lbs. (91kg)
Maintenance
With normal use and handling, this machine will perform accurately over long periods of
time and needs only occasional rechecking for accuracy.