{"id":10659,"date":"2026-10-24T11:37:51","date_gmt":"2026-10-24T03:37:51","guid":{"rendered":"https:\/\/www.hginstrument.com\/?p=10659"},"modified":"2026-10-22T11:39:54","modified_gmt":"2026-10-22T03:39:54","slug":"level-instrument-factory-assembly-procedures-for-submersible-and-immersion-models","status":"publish","type":"post","link":"https:\/\/www.hginstrument.com\/fr\/level-instrument-factory-assembly-procedures-for-submersible-and-immersion-models\/","title":{"rendered":"Level Instrument Factory Assembly Procedures for Submersible and Immersion Models"},"content":{"rendered":"<p>This article provides an in-depth look at the factory assembly procedures for submersible and immersion level instruments, focusing on the practices at Jiangsu Hongguang Instrument Factory Co., Ltd. (Hongguang instrument). The factory, founded in 1972 and a subsidiary of SUYI Group, produces a wide range of industrial automation instruments, including level, flow, pressure, and temperature devices. The assembly process is broken down into stages: incoming material inspection, sub-assembly of sensing elements, electronics assembly, calibration and functional testing, encapsulation and sealing, final assembly, quality control, and packaging. Each stage is crucial to ensure the reliability and accuracy of the instruments, especially for submersible models that must withstand harsh environments. The article highlights specific products such as radar level meters, magnetic level indicators, ultrasonic level meters, and pressure transmitters, discussing their unique assembly considerations. It also covers the factory&#8217;s certifications (ISO 9001, ISO 14001, ISO 45001, and SIL) and its role as a certified supplier to major enterprises like CNPC, SINOPEC, and power generation groups. The assembly procedures emphasize quality, safety, and customer satisfaction, with products designed for applications in petroleum, chemical, water treatment, and other industries. The factory&#8217;s commitment to stable performance and after-service cost savings is underscored. As technology advances, the factory integrates modern features like wireless connectivity while maintaining rigorous standards. The article concludes that Hongguang instrument&#8217;s meticulous assembly procedures and adherence to international standards make it a trusted partner in industrial automation.<\/p>\n<nav class=\"toc\" style=\"background: #fff; padding: 5px;\">\n<ul>\n<li><a href=\"#factory-overview-a-legacy-of-excellence\">Factory Overview: A Legacy of Excellence<\/a><\/li>\n<li><a href=\"#assembly-procedures-from-components-to-completed-instruments\">Assembly Procedures: From Components to Completed Instruments<\/a><\/li>\n<li><a href=\"#incoming-material-inspection-and-preparation\">Incoming Material Inspection and Preparation<\/a><\/li>\n<li><a href=\"#subassembly-of-sensing-elements\">Sub-Assembly of Sensing Elements<\/a><\/li>\n<li><a href=\"#electronics-assembly-and-wiring\">Electronics Assembly and Wiring<\/a><\/li>\n<li><a href=\"#calibration-and-functional-testing\">Calibration and Functional Testing<\/a><\/li>\n<li><a href=\"#encapsulation-and-sealing\">Encapsulation and Sealing<\/a><\/li>\n<li><a href=\"#final-assembly-and-mechanical-checks\">Final Assembly and Mechanical Checks<\/a><\/li>\n<li><a href=\"#quality-control-and-assurance\">Quality Control and Assurance<\/a><\/li>\n<li><a href=\"#packaging-and-shipping\">Packaging and Shipping<\/a><\/li>\n<li><a href=\"#specific-level-instrument-models-and-assembly-considerations\">Specific Level Instrument Models and Assembly Considerations<\/a><\/li>\n<li><a href=\"#radar-level-meter\">Radar Level Meter<\/a><\/li>\n<li><a href=\"#magnetic-level-indicator\">Magnetic Level Indicator<\/a><\/li>\n<li><a href=\"#ultrasonic-level-meter\">Ultrasonic Level Meter<\/a><\/li>\n<li><a href=\"#pressure-transmitter-for-level-measurement\">Pressure Transmitter for Level Measurement<\/a><\/li>\n<li><a href=\"#crossproduct-integration-and-applications\">Cross-Product Integration and Applications<\/a><\/li>\n<li><a href=\"#quality-certifications-and-industry-standards\">Quality Certifications and Industry Standards<\/a><\/li>\n<li><a href=\"#meeting-industry-needs\">Meeting Industry Needs<\/a><\/li>\n<li><a href=\"#advancements-and-future-trends\">Advancements and Future Trends<\/a><\/li>\n<li><a href=\"#conclusion\">Conclusion<\/a><\/li>\n<\/ul>\n<\/nav>\n<p>In the realm of industrial automation, level measurement stands as a critical parameter for ensuring safety, efficiency, and quality across a multitude of processes. The assembly of level instruments, particularly submersible and immersion models, demands meticulous procedures, precision engineering, and rigorous testing. This article delves into the comprehensive assembly procedures employed by modern factories, with a spotlight on Jiangsu Hongguang Instrument Factory Co., Ltd. (Hongguang instrument), a distinguished manufacturer in this field.<\/p>\n<h2 id=\"factory-overview-a-legacy-of-excellence\">Factory Overview: A Legacy of Excellence<\/h2>\n<p>Founded in 1972, Jiangsu Hongguang Instrument Factory Co., Ltd. is an experienced manufacturer of industrial automation instruments, wireless control systems, and process control equipment. As a state-owned enterprise and one of the subsidiaries of SUYI Group, the factory upholds a tradition of quality and reliability. Presently, it provides nine categories of products, including flow, pressure, level, temperature, valves, calibrators, recorders, analyzers, and switches. These products are widely used in industries such as petroleum, chemical, papermaking, water treatment, municipal engineering, food processing, power generation, steelmaking, coal, pharmaceutical, and environmental protection.<\/p>\n<p><img decoding=\"async\" title=\"Level Instrument Factory Assembly Procedures for Submersible and Immersion Models\" src=\"https:\/\/www.hginstrument.com\/wp-content\/uploads\/2021\/07\/single-flange-level-transmitter1.jpg\" alt=\"Level Instrument Factory Assembly Procedures for Submersible and Immersion Models\" \/><\/p>\n<p>Hongguang instrument holds certifications from reputable bodies, including ISO 9001:2015, ISO 14001:2015, ISO 45001:2018 (all by China Quality Mark Certification Group), and SIL (Ente Certificazione Macchine). The factory is a certified measurement solutions provider for major state-owned enterprises such as CNPC, SINOPEC, GD Power Development Co., Ltd., China Huadian Corporation, China Huaneng Group, China Datang Corporation, Shenhua Group, and over 70% of large iron and steel enterprises in China. Such recognition underscores the factory\u2019s commitment to high-quality manufacturing and process safety.<\/p>\n<h2 id=\"assembly-procedures-from-components-to-completed-instruments\">Assembly Procedures: From Components to Completed Instruments<\/h2>\n<p>The assembly of submersible and immersion level instruments involves several distinct stages, each requiring careful attention to detail and adherence to strict specifications. The following sections outline the key procedures used at Hongguang instrument and similar factories.<\/p>\n<h3 id=\"incoming-material-inspection-and-preparation\">Incoming Material Inspection and Preparation<\/h3>\n<p>Before any assembly begins, all components must undergo incoming material inspection. This includes verifying that sensors, electronic modules, housings, cables, and connectors meet the required standards and specifications. At Hongguang instrument, materials are sourced from certified suppliers and are checked for dimensional accuracy, material compatibility, and cleanliness. This step prevents defective parts from entering the assembly line and ensures the final product&#8217;s reliability.<\/p>\n<p>For submersible and immersion models, the housings are often made from corrosion-resistant materials such as stainless steel or specialized plastics. The sensor elements, which may include pressure diaphragms, ultrasonic transducers, or radar antennas, are inspected for proper functionality and surface finish. Each component is cleaned to remove any contaminants that could affect performance or longevity.<\/p>\n<h3 id=\"subassembly-of-sensing-elements\">Sub-Assembly of Sensing Elements<\/h3>\n<p>The core of any level instrument is its sensing element. For submersible hydrostatic level transmitters, a pressure sensor is mounted onto a diaphragm assembly. This process involves precision alignment and welding to ensure a hermetic seal. The sensor is then attached to an amplifying circuit board that converts the pressure signal into an analog or digital output.<\/p>\n<p>For radar level meters, the antenna and microwave module are assembled together. The antenna is positioned to transmit and receive electromagnetic waves, and the module is calibrated to measure time-of-flight for accurate level detection. Similarly, ultrasonic level meters require the careful placement of transducers and the damping material to avoid false echoes.<\/p>\n<p>Magnetic level indicators, which are popular for local indication, involve the assembly of a float with a magnetic chamber and a series of flags or a follower magnet. The float is inserted into a bypass chamber, and the magnets are oriented to trigger the indicating mechanism. For models with level switches, the magnetic field activates reed switches at predetermined positions.<\/p>\n<h3 id=\"electronics-assembly-and-wiring\">Electronics Assembly and Wiring<\/h3>\n<p>After the sensing elements are prepared, the electronics assembly begins. This includes mounting circuit boards, connecting wires, and installing connectors. For submersible models, the electronics are typically potted or encapsulated to protect against moisture and pressure. The assembly process must ensure that all solder joints are clean and secure, and that wiring is correctly routed to avoid interference.<\/p>\n<p>At Hongguang instrument, technicians follow detailed assembly drawings and work instructions. They use calibrated tools to torque bolts to specific values and apply thread sealant to prevent leaks. The wiring is verified against the schematic to ensure proper polarity and signal integrity.<\/p>\n<p><img decoding=\"async\" title=\"Level Instrument Factory Assembly Procedures for Submersible and Immersion Models\" src=\"https:\/\/www.hginstrument.com\/wp-content\/uploads\/2021\/07\/magnetic-level-guage-0.jpg\" alt=\"Level Instrument Factory Assembly Procedures for Submersible and Immersion Models\" \/><\/p>\n<h3 id=\"calibration-and-functional-testing\">Calibration and Functional Testing<\/h3>\n<p>Calibration is a crucial step in the assembly process. Each instrument is calibrated to meet its specified accuracy. For level transmitters, this involves applying known pressures or level heights and adjusting the zero and span settings. For radar and ultrasonic meters, the calibration may involve setting the range, damping, and output parameters.<\/p>\n<p>The functional testing includes checking the output signal, verifying the response to level changes, and confirming the operation of any switches or alarms. For submersible models, a pressure chamber test simulates the operating conditions to ensure the instrument can withstand hydrostatic pressure without leakage. This is particularly important for immersion applications in deep tanks or wells.<\/p>\n<h3 id=\"encapsulation-and-sealing\">Encapsulation and Sealing<\/h3>\n<p>Submersible and immersion models must withstand harsh environments, including moisture, chemicals, and physical stress. Therefore, the assembly process includes encapsulation and sealing steps. The housing is sealed with O-rings, gaskets, or potting compounds. For cable entry points, special glands or connectors are used to provide a watertight seal.<\/p>\n<p>Hongguang instrument employs advanced techniques such as laser welding for metal housings and conformal coating for the electronics. These measures extend the product&#8217;s service life and reduce maintenance costs for the customer. As the company notes, their products feature stable performance, saving after-service costs for the customer.<\/p>\n<h3 id=\"final-assembly-and-mechanical-checks\">Final Assembly and Mechanical Checks<\/h3>\n<p>Once the electronics are calibrated and sealed, the final assembly involves mounting the instrument into its housing, attaching any flanges or fittings, and installing the display or indicator. Mechanical checks include verifying that all screws are tightened, the housing is properly aligned, and the instrument is free from visual defects.<\/p>\n<p>For magnetic level indicators with transmitters or switches, the integration of these accessories is performed at this stage. The transmitter is calibrated to output a standard analog current signal (e.g., 4-20 mA), while the switches are tested for their set points and hysteresis. The factory ensures that all options are configured according to customer specifications.<\/p>\n<h3 id=\"quality-control-and-assurance\">Quality Control and Assurance<\/h3>\n<p>Throughout assembly, quality control is paramount. At Hongguang instrument, each instrument must pass a series of inspections and tests before being released. These include visual inspection, dimensional checks, leak testing, and performance testing. The factory maintains a comprehensive quality management system that is certified to ISO 9001:2015.<\/p>\n<p>For products with SIL certification, additional tests are performed to verify the safety functions. For instance, the ultrasonic level meter, magnetic level indicator, electromagnetic flow meter, metal tube rotameter, radar level meter, pressure transmitter, temperature transmitter, and tuning fork level controller have SIL certificates. These products must meet stringent functional safety requirements, and the assembly process is designed to ensure traceability and repeatability.<\/p>\n<h3 id=\"packaging-and-shipping\">Packaging and Shipping<\/h3>\n<p>The final stage of the assembly procedure is packaging and shipping. Instruments are packed in protective materials to prevent damage during transit. For submersible models, the cable ends are sealed to prevent moisture ingress. Documentation such as calibration certificates, test reports, and user manuals are included in the packaging. Hongguang instrument strives to deliver products that are ready for installation and use.<\/p>\n<h2 id=\"specific-level-instrument-models-and-assembly-considerations\">Specific Level Instrument Models and Assembly Considerations<\/h2>\n<p>Different types of level instruments have unique assembly requirements. Below is a closer look at some of the products manufactured by Hongguang instrument and the specific procedures involved.<\/p>\n<h3 id=\"radar-level-meter\">Radar Level Meter<\/h3>\n<p>The radar level meter is used to measure liquid levels (water, oil, chemical liquid) in storage tanks, and can also measure material level in powder or grain particle silos. The assembly of these instruments involves precise alignment of the antenna and the microwave transmitter. For high-accuracy applications, a process connection such as a flange or a threaded mount is installed. The electronics are then configured with the appropriate measuring range and output protocol.<\/p>\n<p>The calibration process for a radar level meter often involves a \u2018dry run\u2019 or a simulation of the empty and full conditions. This ensures that the instrument functions correctly in the field. For submersible or immersion models, the radar unit is usually housed in a sealed enclosure to protect it from moisture.<\/p>\n<h3 id=\"magnetic-level-indicator\">Magnetic Level Indicator<\/h3>\n<p>Magnetic level indicators (MLIs) are used to measure liquid levels in storage tanks. They can be configured with a level transmitter to output an analog current signal, or with non-hold or hold type level switches to implement level control or alarm. In the assembly, the float and chamber are cleaned to ensure the magnetic coupling is unimpeded. The transmitter or switches are mounted at specified positions along the chamber. The assembly must ensure that the magnetic field of the float correctly activates the indicating flags or the switches.<\/p>\n<p>For submersible applications, the MLI is often installed in a bypass chamber that is isolated from the process liquid, so the instrument itself is not directly immersed. However, the assembly still requires careful sealing of the chamber to prevent leaks.<\/p>\n<h3 id=\"ultrasonic-level-meter\">Ultrasonic Level Meter<\/h3>\n<p>Ultrasonic level meters are non-contact instruments, but for immersion models, the transducer may be mounted in a protective housing that is submerged in the liquid. The assembly involves aligning the transducer to face the liquid surface and ensuring that the acoustic signal is not obstructed. The electronics are calibrated to compensate for temperature and to filter out false echoes.<\/p>\n<p>Hongguang instrument\u2019s ultrasonic level meters have SIL certification, which means the assembly process must include independent verification of the safety functions. This often involves redundant signal processing and self-diagnostic features.<\/p>\n<h3 id=\"pressure-transmitter-for-level-measurement\">Pressure Transmitter for Level Measurement<\/h3>\n<p>Pressure transmitters are often used for hydrostatic level measurement in submersible applications. The assembly includes a pressure sensor module that is welded to a diaphragm and a housing that is sealed to withstand full submersion. The electronics are encapsulated in a waterproof potting material, and the cable entry is sealed with a watertight connector. The transmitter is calibrated to indicate level based on the specific gravity of the process liquid.<\/p>\n<p>The pressure transmitter is widely used in the chemical industry, and its assembly must meet the stringent requirements for chemical resistance and safety. Hongguang instrument ensures that all wetted parts are compatible with the intended media.<\/p>\n<h2 id=\"crossproduct-integration-and-applications\">Cross-Product Integration and Applications<\/h2>\n<p>In a level instrument factory, assembly procedures are not limited to individual products. Often, integrated solutions are required. For example, the Multi-Variable differential pressure flow transmitter is used for assembling with throttling devices such as V-cone, Orifice-plate, Verabar, Nozzle, and Venturi. This transmitter directly displays instantaneous flow rate and total flow, with unit options including M3, Ton, and MMSCFD. The assembly of such systems involves mounting the transmitter onto the throttling device, connecting impulse lines, and performing a complete system calibration.<\/p>\n<p><img decoding=\"async\" title=\"Level Instrument Factory Assembly Procedures for Submersible and Immersion Models\" src=\"https:\/\/www.hginstrument.com\/wp-content\/uploads\/2021\/07\/hgrd-700-00.jpg\" alt=\"Level Instrument Factory Assembly Procedures for Submersible and Immersion Models\" \/><\/p>\n<p>Another example is the Wall-mounted Doppler open channel flow meter, which is used to measure flow velocity and can set algorithms to calculate flow rate. It is mainly used in sewage pipes (chemical wastewater, pre-treated wastewater, wastewater after initial treatment), total stormwater pipes, and irrigation channels (used with standard weirs or flumes, such as triangular weir, rectangular weir, Parshall flume). The assembly procedure for this instrument includes positioning the Doppler sensor in the channel, wiring to the wall-mounted unit, and configuring the measurement parameters.<\/p>\n<p>The factory also produces electromagnetic flow meters applicable for measuring water flow rate in water projects, sewage treatment plants, pulp industry, and flocculating agent factories. Vortex flow meters are applicable for measuring steam flow rate, mostly in power plants and supply heating industry. Thermal mass flow meters are applicable for measuring compressed air, natural gas, and biogas flow rate. While these are flow products, they share similar assembly procedures, and the factory\u2019s expertise in level and flow instruments ensures a holistic approach to process measurement.<\/p>\n<h2 id=\"quality-certifications-and-industry-standards\">Quality Certifications and Industry Standards<\/h2>\n<p>The assembly procedures at Hongguang instrument are governed by a robust quality management system. The factory is certified to ISO 9001:2015 (Quality Management Systems), ISO 14001:2015 (Environmental Management), and ISO 45001:2018 (Occupational Health and Safety Management). These certifications demonstrate the company\u2019s commitment to quality, environmental responsibility, and employee safety.<\/p>\n<p>Additionally, the following products have SIL certificates: Ultrasonic level meter, Magnetic level indicator, Electromagnetic flow meter, Metal tube rotameter, Radar level meter, Pressure transmitter, Temperature transmitter, and Tuning fork level controller. SIL (Safety Integrity Level) certification is essential for instruments used in safety-critical applications. The assembly procedures for these products include additional testing and documentation to ensure that they meet the required safety integrity levels.<\/p>\n<p>The factory also adheres to the China Quality Mark Certification Group standards, which further validates the reliability of their products.<\/p>\n<h2 id=\"meeting-industry-needs\">Meeting Industry Needs<\/h2>\n<p>Hongguang instrument serves a wide range of industries, including petroleum, chemical, papermaking, water treatment, municipal engineering, food processing, power generation, steelmaking, coal, pharmaceutical, and environmental protection. The assembly procedures are tailored to meet the specific requirements of each sector. For instance, instruments used in hazardous areas require explosion-proof housings and intrinsically safe circuits. The factory employs skilled technicians who are trained to assemble these specialized units.<\/p>\n<p>For large-scale projects, the factory has supplied measurement solutions to CNPC, SINOPEC, power development companies, China Huadian Corporation, China Huaneng Group, China Datang Corporation, Shenhua Group, and over 70% of large iron and steel enterprises in China. This extensive track record underscores the trust that major industrial players place in Hongguang instrument products.<\/p>\n<h2 id=\"advancements-and-future-trends\">Advancements and Future Trends<\/h2>\n<p>As technology evolves, the assembly procedures for level instruments are also advancing. The integration of wireless connectivity and IoT capabilities is becoming more common. Modern submersible level transmitters can now be equipped with Bluetooth or NB-IoT modules for remote monitoring. The factory adapts its assembly processes to incorporate these technologies while maintaining reliability and cost-effectiveness.<\/p>\n<p>The use of automated assembly tools and robotic systems is increasing, improving precision and reducing human error. However, expert oversight remains essential, particularly for calibration and final testing. Hongguang instrument balances automation with skilled craftsmanship to deliver superior products.<\/p>\n<h2 id=\"conclusion\">Conclusion<\/h2>\n<p>The assembly of submersible and immersion level instruments is a multifaceted process that demands precision, stringent quality control, and a deep understanding of application requirements. Jiangsu Hongguang Instrument Factory Co., Ltd. exemplifies these principles, with a legacy of excellence spanning over 50 years. Through meticulous procedures, adherence to international standards, and a customer-centric approach, the factory ensures that its instruments perform reliably in the harshest environments.<\/p>\n<p>Whether it is a radar level meter for a chemical storage tank or a magnetic level indicator for a boiler drum, the assembly procedures at Hongguang instrument guarantee accuracy, durability, and safety. As the industry continues to evolve, the factory remains at the forefront, continuously improving its processes to meet the changing needs of its global clientele.<\/p>\n<p>In summary, the factory\u2019s commitment to quality is evident in every step of the assembly, from incoming inspection to final packaging. With certifications such as ISO and SIL, and a proven track record with major enterprises, Hongguang instrument stands as a trusted partner in the field of industrial automation.<\/p>","protected":false},"excerpt":{"rendered":"<p>This article provides an in-depth look at the factory assembly procedures for submersible and immersion level instruments, focusing on the practices at Jiangsu Hongguang Instrument Factory Co., Ltd. (Hongguang instrument). The factory, founded in 1972 and a subsidiary of SUYI Group, produces a wide range of industrial automation instruments, including level, flow, pressure, and temperature &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/www.hginstrument.com\/fr\/level-instrument-factory-assembly-procedures-for-submersible-and-immersion-models\/\"> <span class=\"screen-reader-text\">Level Instrument Factory Assembly Procedures for Submersible and Immersion Models<\/span> Lire la suite\u00a0\u00bb<\/a><\/p>","protected":false},"author":6,"featured_media":3468,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2352],"tags":[],"class_list":["post-10659","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-events"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.hginstrument.com\/fr\/wp-json\/wp\/v2\/posts\/10659","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.hginstrument.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.hginstrument.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.hginstrument.com\/fr\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/www.hginstrument.com\/fr\/wp-json\/wp\/v2\/comments?post=10659"}],"version-history":[{"count":0,"href":"https:\/\/www.hginstrument.com\/fr\/wp-json\/wp\/v2\/posts\/10659\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.hginstrument.com\/fr\/wp-json\/wp\/v2\/media\/3468"}],"wp:attachment":[{"href":"https:\/\/www.hginstrument.com\/fr\/wp-json\/wp\/v2\/media?parent=10659"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.hginstrument.com\/fr\/wp-json\/wp\/v2\/categories?post=10659"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.hginstrument.com\/fr\/wp-json\/wp\/v2\/tags?post=10659"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}