The B49H Bicolor Glass Level Gauge is indicated as the result of the different transparency of the two media and in some cases (for water steam), by conveying upwards on to the surface of separation (between liquid and gaseous substances) a source of light located at the back of the gauge, the rays of which are totally reflected down to the observer.

Through the principle of optical reflection and refraction, the red and green light emitted by the red and green LED light source lamp are fired into the observation window of the water level meter body, respectively, so that the operator can be on the spot in the boiler drum.Or through the industrial television monitoring system in the centralized control room on the display can be directly and clearly observed the situation of the drum water level, observed steam red, water green, steam full red, water all green display effect.

Features:
1. Simple to install – no calibration is necessary.
2. Can be used as a reference to check, or calibrate, other level technologies.
3. Pressure rating from vacuum to 4Mpa.
4. Temperature rating from -20℃ to 450℃
5. Not affected by the chemical or electrical properties of the process liquid.
6. Specific gravity, dielectric, conductivity, surface turbulence, vapor, foam, etc. no longer needs to be considered.

Type	B49H DN25 DN20(mm)
Nominal pressure	1.6MPa	2.5MPa	4.0MPa
Test pressure	2.45MPa	3.8MPa	6.0MPa
Install center to center distance	250, 300, 330, 350, 400, 440(mm)
Connection Size	DN20 DN25, can also customize other size
Visual height	145~195(mm)
Display color code	Green: for air Red : for water
Observing distance	≤60m
Viewing angle scope	20°
Main material	Q235-A carbon steel
Voltage, power	AC 36±4V,6W~10W
Medium temperature	≤250°C

Features of B49H Bicolor Glass Level Gauge

1. Distinct Red-Green Two-Color Optical Display

It adopts light refraction & reflection principle based on different refractive indexes of water and steamMade-in-Ch...:

Steam section shows bright red; liquid water section shows clear green
The dividing line between red and green is sharp without blurring
Visible distance reaches up to 60 meters, easy to read from far away, day and night
Equipped with built-in LED backlight, works well in dark boiler rooms without extra lighting

2. High Temperature & Medium Pressure Resistance

Standard model B49X-2.5: nominal pressure 2.5MPa, max medium temperature ≤225℃
Body material: cast steel / carbon steel, matched with high-strength quartz sight glass
Stable operation for industrial steam boilers, steam drums and pressure vessels

3. Built-in Anti-Burst Self-Sealing Safety Structure

Upper & lower gauge cocks are fitted with automatic blocking steel balls:

If the quartz glass panel cracks accidentally, medium pressure pushes the steel ball to instantly seal the pipeline, preventing hot water/steam ejection, avoiding scald accidents and medium leakage.

Integrated metal protective cover further shields the sight glass from impact damage.

4. Complete Supporting Valve & Easy Maintenance Design

Matched with dedicated steam cock, water cock and drain vent cock, realizes isolation, flushing and pressure relief without shutting down the boiler
Reserved cleaning brush hole to clear scale and dirt inside the gauge body conveniently
Modular split structure: the gauge can be detached alone for glass replacement without disassembling boiler flanges

5. High Measurement Reliability, No False Water Level

Communicating vessel structure consistent with boiler drum pressure balance
Not affected by medium conductivity, foam or slight water turbulence
Serves as the primary safety reference water level gauge for boilers, can calibrate remote electric level transmitters

6. Flexible Installation Specifications

Multiple standard center distances (250/300/350/440mm) for matching various boiler drums; standard DN25 flange connection, easy mounting and interchangeable with traditional flat glass level gauges

7. Wide Applicability & Stable Performance

Specially designed for industrial steam boilers, also applicable for chemical, power, textile heating equipment; long service life, low failure rate, simple operation and low maintenance cost, complying with HG/T2483-2006 industry standard

Brief Summary for Product Introduction

The B49X two-color water level gauge features clear red-green optical display, long-distance visibility, built-in anti-break self-sealing protection, high temperature and pressure resistance. Equipped with complete flushing and isolation cocks, it delivers accurate, safe and reliable water level monitoring for all types of industrial boilers.

B49H Bicolor Glass Level Gauge