03.09
product manual
H-4200
Soil Penetrometer
General
The Pocket Penetrometer is designed as a lightweight instrument for use by
field personnel to check visual classification of soils. It can be used to verify
whether excavation side walls require shoring, based on OSHA cohesive
soils classifications.
It indicates consistency, shear strength, and approximate unconfined shear
strength. Direct-reading scale—in tons/sq ft, or kg/sq cm—corresponds to
equivalent unconfined compressive strength. The readings obtained from
the Penetrometer do not replace laboratory test results due to the fact
that a small area of penetration test could give misleading results. The
instrument should not be used for obtaining foundation design data.
nnmm
Instruction
The scale indicator must be fully inserted into the Penetrometer body until
the "0.0" mark only is showing. The stainless steel piston (opposite end of
the scale indicator) has a tip area of 0.05 square inch (0.32 sq. cm). In use,
it is pressed into the soil until the engraved line, 1/4" (6.35 mm) from the
tip, reaches the soil level. A reading can now be taken from the scale
indicator. The scale is calibrated in tons per square foot or kilograms per
square centimeter unconfined compressive strength.
Maximum reading of the Penetrometer is 4.5 tons per square foot or 4.5
kilograms per square centimeter. Pocket Penetrometers are not individually
calibrated and therefore, no calibration certificates are supplied. An error of
up to 1/2 division on the scale, equivalent to 0 to 0.124 TSF, is possible with
the instrument.
Adapter Foot
The H-4200F Adapter foot is recommended when testing extremely
low strength cohesive soils. 1" (25mm) dia. foot, compared to the 1/4"
(6.35mm) penetrometer piston, increases the effective area measured by
16 times. Divide by 16 to obtain correct unconfined compressive strength
when the reading in tons per square foot or kilograms per square
centimeter is on the low-load side.
OSHA Soil Categories
OSHA categorizes soil and rock deposits into four types, A through D, as
follows:
Stable Rock: is natural solid mineral matter that can be excavated with
vertical sides and remain intact while exposed. It is usually identified by a
rock name such as granite or sandstone. Determining whether a deposit is of
this type may be difficult unless it is known whether cracks exist and whether
or not the cracks run into or away from the excavation.
Type A Soils: are cohesive soils with an unconfined compressive strength
of 1.5 tons per square foot (tsf) (144 kPa) or greater. Examples of Type A
cohesive soils are often: clay, silty clay, sandy clay, clay loam and, in some
cases, silty clay loam and sandy clay loam. (No soil is Type A if it is fissured,
is subject to vibration of any type, has previously been disturbed, is part of a
sloped, layered system where the layers dip into the excavation on a slope of
4 horizontal to 1 vertical (4H:1V) or greater, or has seeping water.
Type B Soils: are cohesive soils with an unconfined compressive strength
greater than 0.5 tsf (48 kPa) but less than 1.5 tsf (144 kPa). Examples of
other Type B soils are: angular gravel; silt; silt loam; previously disturbed
soils unless otherwise classified as Type C; soils that meet the unconfined
compressive strength or cementation requirements of Type A soils but are
fissured or subject to vibration; dry unstable rock; and layered systems
sloping into the trench at a slope less than 4H:1V (only if the material would
be classified as a Type B soil).
Type C Soils: are cohesive soils with an unconfined compressive strength
of 0.5 tsf (48 kPa) or less. Other Type C soils include granular soils such as
gravel, sand and loamy sand, submerged soil, soil from which water is
freely seeping, and submerged rock that is not stable. Also included in this
classification is material in a sloped, layered system where the layers dip into
the excavation or have a slope of four horizontal to one vertical (4H:1V) or
greater.
Layered Geological Strata: Where soils are configured in layers, i.e., where
a layered geologic structure exists, the soil must be classified on the basis of
the soil classification of the weakest soil layer. Each layer may be classified
individually if a more stable layer lies below a less stable layer, i.e., where a
Type C soil rests on top of stable rock.
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. shall not be responsible under this warranty if the goods have been
improperly maintained, installed, operated or the goods have been altered or
modified so as to adversely affect the operation, use performance or durability
or so as to change their intended use. The Humboldt Mfg. Co. liability under
the warranty contained in this clause is limited to the repair or replacement of
defective goods and making good, defective workmanship.
Humboldt Mfg. Co.
3801 North 25th Avenue
Schiller Park, Illinois 60176 U.S.A.
Testing Equipment for
HUMBOLDT
www.humboldtmfg.com
U.S.A. Toll Free: 1.800.544.7220
Voice: 1.708.456.6300
Fax: 1.708.456.0137
Email: hmc@humboldtmfg.com
Construction Materials
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