The Onyx Isolator Ring Out-Performs
Conventional Isolator Rings And Standard Diaphragm Seals
Obtaining accurate pressure readings
on pipelines is difficult because slurries, abrasives
and solids clog gauges, switches and transmitters. Standard
diaphragm seals - which are drilled or welded at a point
on the pipeline - provide a temporary solution, but
they are vulnerable to plugging by debris or deposits
and stop working when slurry solidifies in the seal
chamber. Conventional isolator rings consist of a rubber
"inner tube" captured in a steel ring. The assembly
is installed between flanges in the process pipe, with
clear instrument fluid behind the rubber membrane transmitting
pressure to the gauge. The inside diameter of the ring
assembly matches the adjacent pipe, so the ring is continually
cleaned by the motion of the process fluid. A common
problem with this type of isolator ring is that any
air in the instrument will compress when pressurized.
This stretches the rubber membrane, causing accuracy
to degrade or the instrument to malfunction. (An air
bubble as small as a pea can make a sensor non-functional.)
To counter this obstacle, isolator ring manufacturers
use a vacuum pump to evacuate the air from the isolator,
before injecting the instrument fluid. To remove the
gauge for replacement or calibration, the entire ring
and gauge assembly must be removed from the process
pipe and the gauge and ring assembly again have to be
drained, evacuated and refilled. The customer for this
type of isolator ring will experience much downtime
and expense. Some manufacturers try to circumvent this
problem by adding a valve to the ring assembly. This
holds the fluid in the ring, but attempting to fill
the gauge by turning it upside down and pouring fluid
into it traps an air pocket at the tip of the Bourdon
tube. Also, attempting to remount the gauge by covering
the connection with your finger while turning it upright
and screwing it into the isolator is rarely successful.
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The Onyx Isolator Ring Offers The
Solid Solution Towards Solving Your Pressure Measurement
Problems
The Onyx Isolator Ring provides a practical, cost-effective
method for obtaining accurate pressure measurements
on slurries, abrasives and hard-to-handle materials.
The Onyx Isolator Ring is a new patented design which
solves the problems associated with many of the isolator
rings on the market today. The Onyx Isolator Ring is
vacuum-filled at the factory with a high-viscosity silicone
fluid; then, permanently-sealed with Onyx's Revolutionary
"Module-Seal". With the Onyx Isolator Ring, there is
no fill port anywhere on the assembly: gauges, switches
and transmitters are supplied separately, are pre-filled,
and have Onyx's special fitting attached. You have the
option of selecting any combination of isolator ring
and gauge and simply snapping them together. With the
Onyx Isolator Ring, you are guaranteed hassle-free operation
and added protection for your sensitive indication instrumentation.
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