Print Logo

Calibration Columns

Corrosion Resistant PVC Calibration Columns

Plast-O-Matic thermoplastic calibration columns are a quick and convenient way to measure or verify pump flow rates, chemical dosing, or chemical feed systems with higher accuracy.  Designed for precise, efficient testing with a variety of installation options.




• All PVC Construction for wide range of liquids — no metal or elastomer components
• Pressure rated to 75 PSI
• 60 second test period provides superior accuracy to shorter test periods
• Direct readings in GPH and mL/minute
• Wide range of cylinder volumes available — 100 ML to 4000 ML
• Highly visible/high contrast graduations
• Graduations have clear mylar overlay for added protection in harsh chemical environments; label resists shrinkage and temperature damage.

• NPT threaded connections standard; BSP threads, sockets, flanges, union ends, ball valves and other connections available
• Options include welded isolation ball valve on one or both ends and loose fit slip removable top cap for convenient cleaning

photo above shows optional connections at left, standard NPT connections at right.

Dimensions & Part Numbers



Installation Notes

caliinstall2Install the calibration column on the inlet side of the pump to be checked.  The calibration column must be mounted in a vertical position and must be below the level of the liquid in the tank so that it will fill when a valve is opened.

Two ball valves of the same size and type must be installed in the system locations shown in the diagram.  Ball valves are recommended because they offer a minimum resistance to flow and they can be opened and closed quickly.

An overflow or return line connection must be installed from the top of the calibration column back to the supply tank.  The calibration column must be vented to the atmosphere when in use.

A support hangar or bracket may be necessary for stability.

Chemical Compatibility and Potential Visibility Damage

There are many variables that affect success or failure of a particular material with any given chemical, including concentration, temperature, and the specific compound of the chemical and the plastic.  Your application may have variables that lead to clouding or lack of visibility and usefulness of the product.  In many cases a physical test of the cylinder under operating conditions is the only way to ensure the success of this material for use with a specific chemical.

Piping Connections & Options

NPT is standard. For socket, BSP threads, metric, spigot, flange, true union ends or other connection options, please consult factory.  Welded isolation ball valve(s) are available as options for one or both connections.  For applications requiring more frequent cleaning or service, an optional loose fit removable top cap is offered.  For custom options or connections, contact factory.

Superior Readability

Mylar overlay and ultra-fine contrast gradation printing combine to provide ultra-high clarity and readability.

Made in USA. All of the above cylinders are machined and/or molded and machined, hand assembled, individually inspected, and tested under pressure at our Cedar Grove, NJ headquarters and carry our True Blue 3-Year Warranty. Product photos are representative and actual appearance may vary based on size and materials.