Yarway Color-Port® Water Level Gauges

Description

Clear Red and Green Water-Level Indication

Yarway Color-Port® water level gauges provide a highly visible, bi-colour indication of boiler water level. The LED illuminator directs red and green light through each gauge port.

Water and steam refract the light differently. As a result, operators see green where water fills the gauge and red where steam appears. This sharp colour contrast helps operators identify the steam-water interface quickly.

Large-diameter port openings further improve visibility. The level display then focuses the coloured light through dedicated viewing slots.

Low-, Medium- and High-Pressure Configurations

Yarway offers Color-Port® water level gauges for several boiler pressure ranges. Low-pressure designs support applications up to 850 psi. Medium-pressure designs support applications up to 1,800 psi. High-pressure designs extend the operating range to 3,000 psi.

The available arrangements include Model 4511N and Model 4595F gauges. Model 4511N supports low- and medium-pressure configurations. Model 4595F supports high-pressure installations.

Customers can also select suitable gauge valves and mounting arrangements. Options include 780 stuffing-box gaugecocks and Welbloc L200V gauge valves.

Spring-Loaded Individual Port Assemblies

Each gauge uses individual port assemblies secured by separate covers along the stainless steel body. Spring cones maintain pressure on the glass and gaskets, helping preserve the required sealing force during operation.

Technicians can tighten or remove a cover and its glass without disturbing the opposite port assembly. They can also replace individual ports while the gauge remains installed. However, Yarway recommends workbench servicing when practical.

Tempered Glass with Protective Mica

Yarway accurately moulds and tempers each circular gauge glass. A thin mica layer protects the glass surface from high-temperature water, steam and alkalis.

This protection becomes particularly important at boiler pressures above 300 psig. High-temperature water can corrode unprotected glass. The mica layer slows this corrosive action and helps extend port life.

Operators should establish a preventive maintenance schedule for the glass, mica and gasket assemblies. White or opaque glass can indicate that the protective mica has deteriorated.

Precisely Positioned Sealing Components

The glass, mica and sealing gasket fit precisely within the gauge body’s gasket groove. A specially moulded flexible graphite gasket sits between the mica and gauge body.

This arrangement supports a tight seal while maintaining the correct position of the port components. A cushion gasket, washer, retaining spring and spring cones complete each assembly.

Proper cleanliness and alignment remain essential during maintenance. Moisture, dirt, grease or fingerprints can reduce visibility and shorten port life.

Flexible Gauge and Viewing Arrangements

Yarway offers gauges with 5 to 26 ports and visibility from 12-3/16 to 72-9/16 inches. Users can combine single or multiple gauges with different columns and valve arrangements.

Direct-view systems give operators a clear view at the gauge. Alternatively, hooded mirror systems can redirect the image for viewing from below. Display hoods can also improve visibility during outdoor installations.

These options help accommodate equipment layout, viewing position and required visible range.

Long-Life LED Illumination

The Yarway LED illuminator mounts directly to the Color-Port gauge. The mounting brackets move along the illuminator’s extruded body, helping make assembly and disassembly quick and easy.

The illuminator uses red and green glass strips to create the bi-colour display. Yarway rates the LEDs for an average service life of up to 100,000 hours.

Customers can select 115 or 230 VAC input power. The power supply can mount directly on the illuminator or remotely up to 200 feet away. Longer distances require application review.