ISOLATION Rings offer unique
Advantges to standard
diaphragm seal assemblies on
waste water applications Non-Clogging Design

Wafer, Bolt-Thru, and Threaded Designs

Instrument Can Be Removed for
Calibration or Replacement

Colonial Instruments
Offers Repair and Calibration Services SCROLL DOWN

The Onyx Isolator Ring is equipped with an integral block valve and module seal.

The bottom half of the Module Seal consists of a ½” thick rubber membrane at the top of the mounting post. This provides a hermetic seal for the Isolator Ring keeping the instrument oil in and the air out.

The top half of the Module Seal is the “Stinger Fitting” a brass or stainless steel fitting with a needle projecting out of the bottom.

Replacing the gauge without compromising the integrity of the vacuum fill – and without removing the Isolator ring from the process pipe - is simple: 1. Close the Block Valve.

2. Unscrew the Lock Ring.

3. Pull the gauge and stinger fitting out as a complete unit.

4. Plug the new gauge and stinger assembly into the Module Seal.

5. Re-tighten the Lock Ring.

6. Open the Block Valve. SCROLL DOWN

our latest product offering is our low volume instrument manifold lvim Learn More About Our LVIM Our proprietary Low Volume Instrument Manifold (LVIM). These were developed to replace the old “Goal Post” configuration. They are great for instrument configurations where both instruments have displays that require the instrument to be in an upright position. These are machined from solid bar or hex stock 316L stainless steel, and have 0.156” bores, which cut down on the overall volume of fluid in the assembly and relives some temperature effect error due to volumetric expansion of the fill fluid. They are offered in both 1/4″ NPT and 1/2″ NPT connection sizes. SCROLL TO BOTTOM