Used to determine density of the drilling fluid. The instrument consists of a constant volume cup with a lever arm and rider calibrated to read directly the density of the fluid in ppg (water 8.33), pcf (water 62.4), specific gravity (water = 1.0) and pressure gradient in psi/1000 ft. (water 433 psi/1000 ft.)

Calibration

• Remove the lid from the cup, and completely fill the cup with water.
• Replace the lid and wipe dry.
• Replace the balance arm on the base with knife-edge resting on the fulcrum.
• The level vial should be centered when the rider is set on 8.33. If not, add to or remove shot from the well in the end of the bream.

Test Procedure

➖Remove the lid from the cup, and completely fill the cup with the mud to be tested.

➖Replace the lid and rotate until firmly seated, making sure some mud is expelled through the hole in the cup.

➖Wash or wipe the mud from the outside of the cup.

➖Place the balance arm on the base, with the knife-edge resting on the fulcrum.

➖Move the rider until the graduated arm is level, as indicated by the level vial on the beam.

➖At the left-hand edge of the rider, read the density on either side of the lever in all desired units without disturbing the rider.

➖Note down mud temperature corresponding to density.