HUMBOLDT H-4195 Soil Penetrometer, Pocket Type

Humboldt H-4195 pocket penetrometer is a lightweight instrument used by field personnel to check the visual classification of soils. It can be used to verify whether excavation side walls require shoring, based on OSHA cohesive soil classifications. It denotes consistency, shear strength and unconfined shear strength.

Working Mechanism:

• Press the red ring against the penetrometer's handle (knurled portion).
• Grip the handle and push the penetrometer's tip into the soil until the groove marked on the tip is level with the soil.
• Take the reading on the scale, which denotes the unconfined compressive strength.
• The measurement should be taken from the lower side of the red ring, closest to the knurled handle.

Features:

• Humboldt H-4195 penetrometer's direct-reading scale is calibrated in tons/sq.ft or kg/sq.cm, which corresponds to the equivalent unconfined compressive strength.
• It has an indicator sleeve that retains reading after the piston is released.
• The unit's maximum reading is 4.5 tons per sq.ft or 4.5 kilograms per sq.cm.

Compatible Accessories:

Humboldt H-4195F Penetrometer Adapter Feet: They are designed for testing extremely low strength cohesive soils and increase the effective area being measured by 16 times. You must divide the value obtained (on the low-load side) by 16 to obtain the correct unconfined compressive strength.

Standards and Approvals:

• OSHA

Frequently Asked Questions:

Q. What are the things to keep in mind while using Humboldt H-4195?

A.

• Choose test spots with a smooth surface.
• Test the surface by holding the pocket penetrometer at a right angle.
• To reduce errors, take several readings close together, discard those that differ significantly from the majority and take an average of the readings.

Q. What is the error rate of the pocket penetrometer?

A. It is possible to have an error of 1/2 division (equivalent to 0 to 0.124 TSF) with this instrument.