Maxos®

Maxos is a name on safety sight glass and flat level gauge glass, the windows that let an operator see into a vessel or read a level. A sight glass is a round disc of glass fitted in a frame so an operator can see into a vessel, line or firebox.

BoilerSupplies.com carries Maxos Safety Sight Glass, Maxos Transparent and Reflex Glass, and Maxos Transparent and Reflex Flat Glass Replacement Kits. For a level gauge, the choice starts with how the gauge reads. Transparent glass sits in a gauge with a light behind it, so the level shows as a clear column. Reflex glass has vertical grooves on the wetted face, so liquid reads dark and vapor reads bright. A replacement kit is the glass with the gaskets and cushions that go with it. The same pages list mica for transparent glass, flat glass gaskets, redline and clear tubular gauge glass and gauge glass float balls, sold without the Maxos name.

Key facts

• A sight glass is a round disc of glass fitted in a frame so an operator can see into a vessel, line or firebox.

• BoilerSupplies.com lists Maxos Safety Sight Glass, Maxos Transparent and Reflex Glass, and Maxos Transparent and Reflex Flat Glass Replacement Kits.

• Reflex flat glass shows liquid as dark and vapor as bright; transparent flat glass needs a light behind the gauge.

• Mica shields transparent glass from the steam and water on higher pressure service.

• In-stock small-pack orders placed before 2:00 PM EST, Monday through Friday, ship the same day.

Which Maxos glass goes in a sight window, sight port or peep hole?

The Maxos Safety Sight Glass. Sight window, sight port and peep glass are trade names for the round glass an operator looks through, and BoilerSupplies.com lists it under that name. A flat gauge glass is a different part: a long flat glass in a level gauge, listed as Maxos Transparent and Reflex Glass. Order the one that matches the opening.

How do I tell transparent flat glass from reflex flat glass?

Look at the face that touches the water. Reflex glass has vertical grooves on that side, and the level shows as a dark band of liquid under bright vapor. Transparent glass is smooth on both faces and needs a light behind the gauge, so the level reads as a clear column. Order the type the gauge already takes.

What does BoilerSupplies.com need to quote Maxos glass?

A Maxos glass quote needs the glass type, the size of the old glass, the service and the quantity. The type is safety sight glass, transparent flat or reflex flat. Measure diameter and thickness for a round sight glass, and length, width and thickness for a flat one. Note steam or liquid service, and for a flat gauge, glass alone or the kit.

When is the Maxos flat glass replacement kit worth it over the glass alone?

When the gauge is coming apart anyway. The Maxos Transparent and Reflex Flat Glass Replacement Kit carries the glass with the gaskets and cushions that go with it, so the gauge goes back together with fresh gaskets and cushions. Buy the glass alone when fresh gaskets are already on the shelf.

Why does mica go in front of transparent gauge glass?

Mica keeps steam and water off the face of transparent glass on higher pressure service. Without it, the wetted face etches until the level is hard to read. The mica sheet sits between the glass and the process, and BoilerSupplies.com lists Mica for Transparent Glass on the same pages as the Maxos glass.

Before calling about Maxos glass, measure the old piece, note whether it is sight, transparent or reflex glass, and count how many you need. Call 1-770-957-9599 or toll free 1-800-780-3776, or send the same details through BoilerSupplies.com.