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The Atlas Special Weight
Indicator can also be used as a stand-by weight indicator.
Calibrated dial faces are available for line sizes from
7/8" to 1 1/4" in English and
metric.
The Atlas Special Weight
Indicator indicates total hook load directly in pounds. The
adjustable damper valves allow for sensitivity adjustment to
cut down on the fluid pulsation and thereby reducing pointer
whip. The instrument also has a vernier pointer with 6 to 1
ratio which is an important aid in such jobs as fishing.
Another feature of the Atlas Special Weight Indicator is the
graduations found in the center dial (calibrated in arbitrary
weight indicator points). These points provide a method of
compensating for hydrostatic head pressure when the diaphragm
is not able to be mounted at the same height as the gauge. All
pressure gauges are affected by hydrostatic head
pressure.
The Atlas Special Weight
Indicator includes a weight indicating gauge with duplex and
movement, a protective steel cabinet with 2 doors, and a dead
line diaphragm with C-clamp. Mounted in the tall steel cabinet
there is space for auxiliary gauges: tong torque, mud
pressure, rotary torque, RPM, and SPM. If these gauges are not
required, or the instrument is to be used as a standby
instrument, the Atlas Special Weight Indicator can be mounted
in a production box.
The diaphragm installs easily on
the dead line. The deflection plug depresses are the weight is
increased and provides a pressure signal to the indicating
gauge where the pressure is indicated as weight. The Atlas
Special Weight Indicator is loaded with the correct amount of
fluid and sealed at the factory.
Also available
in metric and standard international
measurements. | 
