Plast-O-Matic True Blue® brand chemical flow and level indicators offer a safe and economical means of indicating flow, clarity , or exact level of extremely corrosive and ultra-pure liquids such as sulphuric acid, hydrochloric acid, chlorine, caustics, and demineralized water.

Two essential considerations in the choice of a flow or level indicator should be its strength and design simplicity since these factors minimize malfunctions and maintenance problems. All Plast-O-Matic flow and level indicators are designed to withstand reasonable external shocks. Simplicity is their engineering standard. These flow indicators are available in three different models:Series GX single-wall sight glass, Series GY double-wall sight glass, and Series GYW double-wall, wafer-style sight glass. The level indicators are available in one model: Series GL. All are easy to install, practically maintenance free, and above all, easy to view whenever necessary.

Advantages of Plast-O-Matic Flow and Level Indicators:

• Large 360° viewing area.
• Series "GY," "GYW" and "GL" have double wall construction for maximum safety.
• Full flow design (no corners to collect debris).
• Wide choice of select plastic materials to assure maximum chemical compatibility.
• Little or no maintenance required.
• No special hardware required for installation (completely assembled and pre-tested).

Design Features

True Blue® flow and level indicators are designed to indicate the presence or clarity of liquid in a piping system or to indicate level in a tank. They offer a maximum viewing area with a full 360° visibility for dependable observation and inspection from a reasonable distance.

With the exception of the Series "GX" flow indicator, which can only be used for liquids compatible with acrylic, all Plast-O-Matic indicators utilize a double wall construction. All inner walls are Pyrex® for maximum corrosion resistance, and all outer walls are high impact acrylic which acts as an armored shield against external shocks (please see "Cylinder Wall Information" section).

O-ring seals are used on all PLAST-O-MATIC indicators allowing them to seal at extremely low pressures as well as high pressures. In the Series "GYW"wafer style flow indicators, O-ring seals are also supplied for both ends eliminating the need for flange gaskets.

All Plast-O-Matic flow indicators are full ported, eliminating any possible flow resistance.

They are available with an optional mechanical fluttering device to indicate the presence of flow that would otherwise be difficult to see (please see "Fluttering Devices" section).

Stainless steel compatible sight glasses with grounding straps and other features are available by special order.