Humboldt H-4133 Acme Penetrometer - Manual (Page 6)

Calibration
• Obtain a force-measuring gauge appropriate for measuring compressive
force from 20 to 200 lbf and acceptable as reference standard.
• If the measurement standard will not fit under the Penetrometer’s needle
adapter, remove the breather plug, H-4133.8.4 from the cylinder, and the
needle adapter, H-4133.8.9, from the piston stem.
• Remove the gauge & cylinder assembly, H-4133.7A, by taking off the lock
nut, H-4133.8.5.
• Install the cylinder assembly into the measurement standard test frame and
secure with the lock nut and check in 20 lbf steps from 20 to 200 lbf.
• Apply force and check in 20 lbf steps from 20 to 200lbf.
• If the readings depart from the standard more the ± 2 lbf return the gauge
& cylinder assembly to the factory for service.
Maintenance
Keep the units clean at all times. If re-lubrication is necessary, use Teflon based
grease to avoid particulate accumulations.