{"id":40458,"date":"2026-08-05T13:08:58","date_gmt":"2026-08-05T13:08:58","guid":{"rendered":"https:\/\/instrava.com\/?page_id=40458"},"modified":"2026-08-05T13:25:53","modified_gmt":"2026-08-05T13:25:53","slug":"bicolor-level-gauge-for-quartz-glass-tube","status":"publish","type":"page","link":"https:\/\/instrava.com\/fr\/instruments-de-mesure-du-niveau\/sight-glass-gauges\/bicolor-level-gauge-for-quartz-glass-tube\/","title":{"rendered":"Bicolor Level Gauge For Quartz Glass Tube"},"content":{"rendered":"
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Accueil<\/a><\/span><\/span><\/p>\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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\"Indicateur<\/figure><\/div>
\"jauge<\/figure><\/div>
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Bicolor Level Gauge For Quartz Glass Tube<\/h1>\t\t\t\t<\/div>\n\t\t\t\t
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The quartz tube bicolor level gauge is a direct-reading instrument that utilizes optical principles to make the liquid level “distinctly red and green.” It consists of a high-purity quartz glass tube, a meter body shell, and explosion-proof valves, with red displaying the height of the liquid and green for the height of the vapor phase,allowing operators to instantly distinguish fluid states even in harsh environments.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

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\n\n\n\n\"T\u00e9l\u00e9charger\n<\/a>\n\n\n\"T\u00e9l\u00e9charger\n<\/a>\n<\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t
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\n\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\tDemander un devis<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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Caract\u00e9ristiques principales <\/h2><\/span>\n\t\t\t\t\t\t\t\n\t\t\t<\/path><\/svg><\/span>\n\t\t\t<\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t
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  1. Clear indication, good sealing<\/li>
  2. High working temperature: up to +450\u2103<\/li>
  3. It can match the LED light, strength the visible performance<\/li>
  4. High working pressure: up to PN100<\/li>
  5. Long lifetime, simple structure, easy cleaning and maintenance<\/li>
  6. There are two steel ball in the valve at the both sides. When quartz tube happened to explosion, Steel balls can automatically block channel to avoid liquid flow away if the pressure difference between inside and outside is above 0.3Mpa.<\/li><\/ol>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t
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    Caract\u00e9ristiques techniques <\/h2><\/span>\n\t\t\t\t\t\t\t\n\t\t\t<\/path><\/svg><\/span>\n\t\t\t<\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t
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    Recommended C-C\u00a0distance:<\/td>300, 500, 800, 1100, 1400,1700,\u00a02000mm(For other length can be customized)<\/td><\/tr>
    Indicate mode:<\/td>

    Single color, bi-color<\/p>

    (red as vapor phases, green as liquid)<\/p><\/td><\/tr>

    Material:<\/td>304,316L, 1Cr18Ni9Ti, 0Cr18Ni9, 304 with PTFE lining<\/td><\/tr>
    Nominal pressure:<\/td>

    PN6-PN100(\u00d70.1MPa)<\/p>

    304 +PTFE\u2264PN40<\/p>

    PP\u2264PN16<\/p><\/td><\/tr>

    Temp\u00e9rature de travail :<\/td>

    Stainless steel \u2264450\u2103<\/p>

    304+PTFE \u2264150\u2103<\/p>

    PP\u2264100\u2103<\/p><\/td><\/tr>

    Drain valve:<\/td>drain plug \/ valve\u00a0(or customize)<\/td><\/tr>
    Vent valve:<\/td>vent plug \/ valve (or customize)<\/td><\/tr>
    Process flange:<\/td>DN20\/RF HG\/T 20592-09 (or customize)<\/td><\/tr>
    The heat steam interface:<\/td>ZG1\/2\uff02External thread<\/td><\/tr>
    Tracing steam pressure:<\/td>\u00a0Up to 1.0Mpa<\/td><\/tr>
    Steel ball self-closing pressure:<\/td>\u00a0\u22650.3MPa<\/td><\/tr>
    Light:<\/td>LED(standard: 24VDC), 90~250VAC<\/td><\/tr>
    Environment temperature:<\/td>-40~+60\u2103<\/td><\/tr><\/tbody><\/table><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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    Application<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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    The structural design utilizing a flexible tube eliminates installation stress, achieving an observation performance with zero blind zone at the lower end<\/b> et un 100mm blind zone at the upper end<\/b>. The built-in explosion-proof angle valves are equipped with safety steel balls, which automatically seal when the quartz tube ruptures.<\/p>

    It is primarily installed on high-temperature and high-pressure vessels in industries such as petroleum, chemical, electric power, and metallurgy<\/b>, including boiler drums, storage tanks, and reactors. It can measure a wide variety of liquids, handling transparent or translucent media such as water, gasoline, liquefied petroleum gas (LPG), liquid ammonia, propane, aromatics, and acids.<\/p><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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    FAQ<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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    What causes the indication of a quartz glass tube bicolour level gauge to become unclear? <\/h2><\/span>\n\t\t\t\t\t\t\t\n\t\t\t<\/path><\/svg><\/span>\n\t\t\t<\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t
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    When the display of a quartz glass tube bicolour level gauge becomes unclear (such as a decrease in the contrast of red and green colors, blurring, or difficulty in distinguishing the dividing line), it is typically caused by the following reasons:<\/p>

    1. Scaling, Dirt Adhesion, or Impurity Sedimentation on the Inner Wall of the Quartz Glass Tube<\/h4>

    • Cause:<\/b> When measuring water, chemical media, or liquids containing suspended solids over a long period, minerals, crystals, oil stains, or impurities in the medium will adhere and deposit on the inner wall of the quartz glass tube.<\/p><\/li>

    • Effect:<\/b> This directly obstructs or scatters internal light, destroying the original optical refraction effect and causing the colors of the vapor phase (green) and liquid phase (red) to become dim, turbid, or confused.<\/p><\/li><\/ul>

      2. Failure or Angular Deviation of External Light Sources (or Built-in\/Backlight Sources)<\/h4>

      • Cause:<\/b> Quartz tube bicolour level gauges usually rely on specific optical principles or backlighting (such as LED light sources, reflectors, or natural light incidence angles) to present distinct red and green colors. If the light source is damaged, the brightness is insufficient, the external ambient light is too strong\/weak, or the incidence angle of the light source shifts:<\/p><\/li>

      • Effect:<\/b> Light cannot properly penetrate the vapor and liquid phase zones, significantly weakening the bicolour contrast effect.<\/p><\/li><\/ul>

        3. Partial Blockage of Vapor or Liquid Connection Pipes (Stagnant Medium or Minor Vapor Lock)<\/h4>

        • Cause:<\/b> The upper and lower valves are not fully open, or the pipes are blocked by impurities, leading to poor circulation of liquid or gas inside the level gauge.<\/p><\/li>

        • Effect:<\/b> The internal medium remains stationary or marginally retained for a long time, potentially generating micro-bubbles or uneven concentrations locally, which affects the refractive index and results in an unclear display.<\/p><\/li><\/ul>

          4. Changes in the Physical Properties of the Vapor-Liquid Two-Phase Medium Itself<\/h4>

          • Cause:<\/b> If the purity of the measured medium changes (e.g., a liquid that was originally clear and transparent becomes turbid, contains impurities, or darkens in color), its refractive index and light transmittance will change accordingly.<\/p><\/li>

          • Effect:<\/b> A decrease in medium transparency directly weakens the optical bicolour display effect.<\/p><\/li><\/ul>

            Troubleshooting and Handling Recommendations:<\/b><\/p>

            1. Flush and Drain:<\/b> Periodically open the drain valve to flush and remove sediment at the bottom. If the inner wall is severely scaled, isolate the level gauge, disassemble it, and clean the quartz glass tube (taking care to avoid scratching the glass with hard tools during cleaning).<\/p><\/li>

            2. Check Lighting and Light Sources:<\/b> Check whether the supporting light source (if equipped with LED backlighting or illumination lamps) is working properly, and adjust the viewing angle or ambient light.<\/p><\/li>

            3. Verify Valve Status:<\/b> Confirm whether the upper and lower root valves are in the fully open state to ensure smooth medium circulation.<\/p><\/li><\/ol>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t

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              What media are quartz glass tube bicolour level gauges suitable for? <\/h2><\/span>\n\t\t\t\t\t\t\t\n\t\t\t<\/path><\/svg><\/span>\n\t\t\t<\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t
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              Due to the use of high-purity quartz glass and a high-temperature, high-pressure resistant structural design, the quartz glass tube bicolour level gauge exhibits excellent chemical stability and temperature\/pressure resistance. It is suitable for a wide range of transparent, translucent, and even moderately corrosive media, mainly including:<\/p>

              1. Water and Steam Systems<\/h4>

              • Boiler Water and Steam Systems:<\/b> Widely used for monitoring steam drum water levels in power generation, chemical processing, and industrial boilers, as well as measuring boiler feedwater, saturated steam, and condensate.<\/p><\/li>

              • Various Industrial Waters:<\/b> High-temperature and high-pressure pure water, deionized water, cooling circulating water, etc.<\/p><\/li><\/ul>

                2. Petroleum and Petrochemical Media<\/h4>

                • Hydrocarbons and Fuels:<\/b> Crude oil, gasoline, diesel, kerosene, heavy oil, etc.<\/p><\/li>

                • Liquefied Gases:<\/b> Liquefied petroleum gas (LPG), propane, butane, etc.<\/p><\/li>

                • Aromatics and Chemical Feedstocks:<\/b> Benzene, toluene, xylene, ethylene, and various chemical intermediates.<\/p><\/li><\/ul>

                  3. Chemical Liquids and Acid\/Alkali Solutions<\/h4>

                  • Acids and Bases:<\/b> Inorganic acids such as dilute sulfuric acid, hydrochloric acid, nitric acid, as well as various alkaline solutions (model selection must be confirmed based on the corrosion resistance rating of the quartz material and seals).<\/p><\/li>

                  • Organic Solvents:<\/b> Alcohols, ketones, esters, and other organic chemical liquids.<\/p><\/li><\/ul>

                    4. Special Fluids<\/h4>

                    • Liquid Ammonia:<\/b> Liquid ammonia storage tank level monitoring in fertilizer plants and refrigeration systems.<\/p><\/li>

                    • Liquefied Natural Gas (LNG) and Cryogenic Media:<\/b> Products designed with specific structures and materials can also be used for cryogenic or specific liquefied gas observations.<\/p><\/li><\/ul>

                      Summary of Applicable Conditions:<\/b> The quartz glass tube bicolour level gauge is best suited for working conditions that require direct visual observation, involve high operating pressures and temperatures (such as medium- to high-pressure vessels and boiler steam drums), and utilize media with a degree of transparency or translucency<\/b>. It is not recommended for direct use with extremely turbid media, media containing high amounts of suspended solids, or media prone to crystallization that can clog flow passages.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"

                      Bicolor Level Gauge For Quartz Glass Tube The quartz tube bicolor level gauge is a direct-reading instrument that utilizes optical principles to make the liquid level “distinctly red and green.” It consists of a high-purity quartz glass tube, a meter body shell, and explosion-proof valves, with red displaying the height of the liquid and green…<\/p>","protected":false},"author":1,"featured_media":39030,"parent":38926,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"elementor_header_footer","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-40458","page","type-page","status-publish","has-post-thumbnail","hentry"],"acf":[],"yoast_head":"\nQuartz Tube Bi-Color Level Gauges for Procurement Services in China Supplier<\/title>\n<meta name=\"description\" content=\"Need high-quality quartz tube Bi-Colour level gauges? 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