Manual Control Panel

For those operations, which do not require automated control, Humboldt’s HM-4164 and HM-4165 Manual Triaxial Control Panels provide an accurate and easy-to-operate solution for controlling compressed air, water, deaired water and vacuum within an air/water bladder-type triaxial testing system.


The use of these Control Panels provides the necessary control for making changes in cell and back pressures required for sample saturation to be done from a central location on the panel. The operator has complete control of system pressure during the triaxial test with three independently-controlled pressure regulators.

These control panels have a bias pressure regulator feature, which allows simultaneous control of confining and back pressures, while maintaining a constant differential pressure.

Humboldt Manual Control Panels feature an analog input pressure gauge and controller, an air/water filter for the input pressure and de-aired water tank input, a digital pressure readout for each set of cell functions, as well as quick-disconnects for quickly connecting bladders, the pressure controller and triaxial cells.


The HM-4164 provides connections for one triaxial cell, while the HM-4165 provides connections for up to three triaxial cells. For each triaxial cell, one bladder is required for generating the cell pressure and a second bladder is required for back pressure.


Pressure gauge psi BAR Mpa
Max. input pressure 200 14 1.4
Max. output
150 10 1
Pressure resolution 0.1 0.01 0.001
HM-4164 dimensions (L x W x H) 8 x 8 x 37.5″
(203 x 203 x 952mm)
HM-4165 dimensions (L x W x H) 8 x 19.5 x 37.5″
(203 x 495 x 952)


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