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The technical specifications for pressure transmitters (http://yunrun.com.cn/tech/2375.html) are product technical documents that are signed between the buyer and the seller when the buyer purchases a pressure transmitter or differential pressure transmitter. Changhui Instruments shares these technical specifications for reference and use by everyone. I. General Provisions ◆ The buyer and the seller have conducted thorough discussions regarding the technical requirements for aspects such as the design, structure, performance, manufacturing, inspection, transportation, acceptance, installation, commissioning, training, and maintenance of single-crystal silicon pressure transmitters and single-crystal silicon differential pressure transmitters needed for certain equipment of a particular company. They have also discussed issues related to ensuring the long-term safe operation of these pressure and differential pressure transmitters, and as a result, this technical annex has been formulated. This agreement is part of the business contract and has the same legal validity as the contract. ◆The seller bears full responsibility for every aspect related to the pressure and differential pressure transmitters, accessories, and auxiliary equipment provided, including their quality, technical specifications, documentation and drawings, technical support, packaging and transportation, inspection upon unboxing, installation instructions, on-site testing, and equipment operation. The buyer’s approval of the technical agreement does not relieve the seller of its responsibilities. ◆The seller must carry out the design and selection in strict accordance with all the specifications outlined in the inquiry letter, ensuring that the precision, explosion protection level, material quality, etc., meet or exceed the requirements specified therein. The requirements set out in this technical agreement represent the minimum standards; the seller guarantees to provide high-quality products that are brand new, technologically advanced, practical for production, reliable in operation, easy to maintain, and cost-effective, in compliance with both this technical agreement and current industry standards. If the selection of equipment (or materials) falls short of the requirements specified in the request for quotation, the seller shall bear full responsibility for any resulting issues. ◆The seller must provide technical descriptions for each major component and externally sourced part of the supplied instrumentation, specifying detailed specifications, models, and quantities. A certificate of origin must be provided. ◆Any purchased components or equipment within the scope of the design must be approved by the tendering party’s technical department, but the bidder is responsible for all technical aspects. ◆The seller guarantees the quality of the metering equipment, accessories, and auxiliary devices provided, and is committed to delivering technical specifications, documents, and drawings, providing technical support, handling packaging and transportation, as well as assisting with the inspection upon unboxing. ◆The seller guarantees the accuracy and suitability of all instrument equipment and accessory models. ◆The seller guarantees that the metering equipment provided will be fully assembled in the factory, pass testing and commissioning, and ensures the completeness of the supply. ◆The seller’s technical agreement shall comply with the provisions and requirements set out in the technical inquiry document and the design specifications. When the technical inquiry requirements conflict with the documents listed in the inquiry request (including design documents, drawings, or standards), the seller must promptly notify the buyer and the engineering design party, list and explain such discrepancies in a technical deviation table, and obtain confirmation from the buyer and the design institute. Anything not listed in the deviation table by the seller will be deemed to fully meet the requirements of the inquiry specification sheet and supplementary documents. ◆All costs associated with the patents used by the seller are considered to be included in the equipment price, and the seller must ensure that the buyer bears no responsibility whatsoever regarding the patents of the equipment. ◆Before submitting a business bid, the seller must provide the technical supervisor of the buyer with the \"Technical Agreement for Monocrystalline Silicon Pressure Transmitters and Monocrystalline Silicon Differential Pressure Transmitters\", which has been jointly approved by the buyer, the designer, and the seller, before proceeding with the bidding process. Once the Technical Agreement is finalized, the bidder is not allowed to alter the requirements set out in it without permission; otherwise, it shall be deemed that the agreement is invalid. ◆In all drawings, technical documents, equipment correspondence, etc., throughout the future contract negotiations and contract execution process, Chinese shall be used. ◆Documents specified in the technical specifications and contract, including drawings, calculations, instructions, user manuals, etc., must use the International System of Units. ◆During the period from the signing of the contract to the start of manufacturing, the buyer has the right to request additional modifications resulting from changes in specifications, standards, and regulations; the seller shall comply with such requests, and the specific costs shall be agreed upon by both the supplier and the buyer. ◆In the event that the standards used in this technical agreement differ from those adopted by the bidder, the higher standard shall apply. ◆Matters not covered in this technical document shall be determined through consultation between the tenderer and the bidder. II. Engineering Conditions 2.1 Basic Conditions 2.1.1 Atmospheric Pressure: Annual average pressure:×××kPaA; Summer average pressure:×××kPaA; Monthly average minimum pressure:×××kPaA. 2.1.2 Atmospheric Temperature: Annual average temperature:×××℃; Average minimum temperature in the coldest month:×××℃; Average maximum temperature in the hottest month:×××℃; Extreme maximum temperature:×××℃; Extreme minimum temperature:×××℃. 2.1.3 Relative Humidity: Average relative humidity in the coldest month:×××%; Average relative humidity in the hottest month:×××%; Annual average relative humidity:×××%; Monthly average maximum relative humidity:×××%; Monthly average minimum relative humidity:×××%. Since this device is located in a coastal area, careful consideration should be given to measures to prevent salt spray corrosion, including the selection of appropriate materials. 2.2 Engineering Conditions 2.2.1 Measuring Medium and Detailed Operating Conditions 2.2.2 Power Supply Conditions ① AC power supply: Voltage 220VAC±5%/Frequency 50Hz±0.5Hz ； Voltage: 380VAC/50Hz/TN-S system. ② DC power supply (provided by a DC power supply unit or a DC regulated power supply): Voltage: 24V±1V. 2.2.3 Instrument air: Pressure: 0.4–0.6MPa(G); Temperature: Room temperature. 2.2.4 Steam conditions: ① Medium-pressure steam: Temperature: 420±10°C; Pressure: 3.5±0.1MPa(G). ② Low-pressure steam: Temperature: 250±10°C; Pressure: 1.0±0.1MPa(G). 2.2.5 Low-pressure nitrogen: Pressure: 0.4–0.6MPa(G); Temperature: Room temperature. III. Design, manufacturing, and testing standards for pressure transmitters/differential pressure transmitters: 1. The design, manufacturing, and testing of the monocrystalline silicon pressure transmitters and monocrystalline silicon differential pressure transmitters provided by Changhui Instruments must comply with current **standards, international standards, and industry standards, including the materials and accessories used. But not limited to the following standards: ①GB/T 17614.1-2015 \"Transmitters for industrial process control systems – Part 1: Methods for performance evaluation\"; ②GB/T 17614.1-2015 \"Transmitters for industrial process control systems – Part 1: General guidelines for inspection and testing\"; ③GB/T 13283-2008 \"Accuracy classes for measuring and indicating instruments used in industrial process control\"; ④GB 3836.1-2010 \"Electrical equipment for explosive gas environments – Part 1: General requirements\"; ⑤GB 3836.2-2010 \"Electrical equipment for explosive gas environments – Part 2: Flameproof type ‘d’\"; ⑥GB 3836.4-2010 \"Electrical equipment for explosive gas environments – Part 4: Intrinsic safety type ‘i’\"; ⑦GB 4208 \"Degrees of protection provided by enclosures (IP codes)\"; ⑧GB/T 15464-1995 \"General technical requirements for packaging of instruments and meters\"; ⑨JB/T 9329-1999 \"Basic environmental conditions and testing methods for transportation and storage of instruments and meters\". IV. Scope of supply: 1. The seller guarantees that the list of supplied items will be consistent with the specifications provided; in case of any discrepancies, the principle favorable to the buyer shall apply. 2. The scope of supply as specified in this technical agreement is based on the preliminary quotation documents and specifications for the××× project. The final specifications for the instruments will determine the terms of the commercial bid. The specifications are as follows: 3. Provide an Excel version of the instrument supply list in the attachment (attached to the agreement as a separate file). 4. Technical requirements for supply: ① Output signal of monocrystalline silicon transmitter: 4-20mA+HART. ②The monocrystalline silicon transmitter features external zero adjustment and range modification functions. ③The mounting bracket is made of stainless steel. ④The configuration of single-crystal silicon transmitters requires the user to enter settings such as tag numbers, measurement ranges, and engineering units. ⑤The fault mode is set to below 3.6mA. ⑥Please attach the product sample images provided in the agreement. ⑦The factory serial number listed in the supply list must be completed before the equipment leaves the factory. ⑧Surge protectors all use a parallel wiring configuration; a series configuration is not used. Electrical interface: 1/2” NPT. ⑨All monocrystalline silicon transmitters come with an external grounding screw. ⑩⑬The bolts of single-crystal silicon transmitters are not made of carbon steel. ⑪Process interface of pressure transmitter: 1/2” NPT. ⑫When used as a pressure transmitter, the process interface for the differential pressure transmitter is 1/2” NPT; the process interface on the negative pressure side is connected to the atmosphere, and measures should be taken to protect it from wind, rain, and insects. V. Delivery Time 1. Delivery time: × weeks after the contract is signed. 2. Delivery location: the buyer’s project construction site. VI. Table of Technical Deviations is provided as an attachment (attached after this agreement). Note 1: When alternative materials are used, supporting documents must be provided, or the manufacturer must give a guarantee along with proof of its performance. Note 2: For technical items not specified in the deviation table, the seller guarantees that they will meet the requirements outlined in the buyer’s inquiry document. Should any other deviations be found, the seller must meet them unconditionally; otherwise, the seller will lose eligibility to bid. VII. List of special tools and spare parts required for construction, installation, commissioning, and use during the warranty period (included in the total price); a list is attached detailing the name, model specifications, quantity, serial number, manufacturer, brand, place of origin, etc. VIII. Technical specifications for externally purchased main components, accessories, and auxiliary equipment; a list is attached detailing the name, model specifications, quantity, serial number, manufacturer, brand, place of origin, etc. IX. Reference photos and dimension drawings of the products to be supplied (dimensions for threaded connections are specified in detail in the supply list). X. Technical features and descriptions: 1. Product overview: The Changhui YR-ER102 monocrystalline silicon pressure transmitter and YR-ER101 monocrystalline silicon differential pressure transmitter have long provided comprehensive automated measurement solutions for industrial process control, and are used in industries such as chemicals, petroleum, natural gas, power generation, papermaking, metallurgy, and pharmaceuticals, earning high praise from users. Changhui Instrument Manufacturing Co., Ltd. continuously improves product quality and offers a comprehensive after-sales service system to meet the measurement needs for flow, level, and pressure. ◆Measurement principle of single-crystal silicon transmitters ◆ Main technical parameters of single-crystal silicon pressure transmitters ◆ Main technical parameters of single-crystal silicon pressure transmitters ◆ Product advantages ● Safe and reliable, easy to understand ● Flexible applications: level, pressure, density, interface, flow ● Unaffected by agitation or foam ● Not affected by equipment inside the tank ● No moving parts ● Various diaphragm materials available for different applications ● Process connections from small sizes up to 1/2” ● Remote diaphragms enable use in high-temperature or low-temperature/high-pressure environments, as well as in applications involving corrosive, dirty, or viscous media, as well as in applications requiring sanitary or specific process connections ● Unparalleled diaphragm selection – a variety of diaphragm materials are available; standard materials include 316L, Hastelloy C, Hastelloy B, tantalum, 304L, Monel, Inconel 600, Duplex2507, titanium, nickel, and zirconium diaphragms. And gold-plated diaphragms and PTFE coatings are available as options ； Other membrane thickness options include 50μm and 150μm. It can be applied to various complex operating conditions. For complex mixed highly corrosive media, a special option of PFA cover is available to provide excellent corrosion resistance. ●Special applications – For use in vacuum environments, it features a fully welded system design that minimizes leakage points, ensuring the stability and reliability of the system. -For applications with harsh ambient temperatures or high-temperature processes, Rosemount offers integrated heat-traced capillaries to ensure the system’s measurement performance and **reduce on-site installation costs. -For applications prone to hydrogen penetration, gold-plated diaphragms can be provided to effectively prevent such penetration. -For the pitting that often occurs at the capillary connections in industries such as chlor-alkali, coal-fired power generation, and papermaking, heat-shrink tubing can be provided to offer complete protection. -For other special applications, please contact Changhui Instrument Manufacturing Co., Ltd. directly. ◆Quality assurance and control plan: http://yunrun.com.cn/upload/201902/19/201902191841034320.png X. Specifications and calculation documents (attached as appendices to the agreement): 1. Specifications for each unit must be provided (in accordance with the sequence of item numbers specified by the buyer), and all technical details should be supplemented one by one. 2. Provide calculation sheets for each unit individually (they must be provided in the order of the numbers specified in the buyer’s specifications). XI. Marking, Painting, Packaging, and Transportation 1. Nameplate markings: The instrument nameplates shall be made of stainless steel and fabricated using etching techniques; they should indicate specified parameters such as name, number, model, material, range, pressure rating, accuracy class, date of manufacture, serial number, and explosion protection rating. 2. All on-site instrument equipment shall be equipped with durable nameplates indicating the project number and device identifier, which shall be secured to the equipment using stainless steel wire. For split-type field instruments, their sensors and transmitters should be labeled separately, with indications of flow direction, +/– orientation, flange rating standards, etc. 3. Paint ◆ Unless otherwise specified, the paint shall meet the seller’s standards in order to satisfy the environmental conditions specified in the inquiry specification sheet. The paint system recommended by the seller must be approved by the buyer. ◆Color specifications need to be confirmed with the buyer. 4. After inspection and testing, the instrument is completely dehydrated and dried, ready for transportation. Provide sufficient protection to prevent mechanical damage and environmental corrosion during transit, and meet the requirements for outdoor storage on site for at least 6 months prior to installation. 5. Apply a thick layer of rust inhibitor to the exposed polished and machined surfaces (including bolts). Coat or spray a suitable rust inhibitor on the inner metal surface, and label the opening to indicate the type of rust inhibitor used. 6. All openings should be covered or plugged to allow for prolonged exposure prior to installation. The contact surface of the flange gasket should be properly protected to ensure that its serrated surface is not damaged during transportation and storage. Threaded connections should be fitted with protective measures to prevent dirt and foreign particles from entering. 7. Equipment used for oxygen must be degreased. 8. Single-flange level transmitters and double-flange level transmitters shall have their tag numbers marked on the flange or nameplate. XII. Supervision of Manufacturing, Inspection, and Performance Acceptance Tests (Explanation): This clause is used during the execution of the contract to inspect, supervise the manufacturing of, and conduct performance acceptance tests on the equipment provided by the seller (including equipment purchased from subcontractors), in order to ensure that the equipment supplied meets the required standards. Within 2 weeks after the entry into force of this contract, the seller shall provide the buyer with the standards and plans for supervision, inspection, and performance acceptance testing related to the equipment specified in this contract. 1. Factory inspection 1.1 Factory inspection is an important part of quality control. The seller conducts strict inspections and tests at all production stages within the factory. The seller shall provide quality certificates, inspection records, and test reports for the contract equipment, which shall form part of the quality certification documents at the time of delivery. 1.2 All costs associated with factory inspection are included in the total contract price. 2. Performance Acceptance Tests 2.1 Purpose of Performance Acceptance Tests The purpose is to verify whether all the performance characteristics of the equipment specified in the contract meet the requirements outlined in Annex 1. 2.2 The location for the performance acceptance test shall be determined by the contract, usually at the buyer’s factory. 2.3 Timing of performance tests: The tests are generally conducted within six months after the trial operation, with the specific timing determined by both the supplier and the buyer. 2.4 The performance acceptance tests shall be determined through discussion between the buyer and the seller. If the testing is carried out on-site, the seller shall provide cooperation ； If the testing is carried out at the factory, the seller shall provide the manpower and resources required for the testing. 2.5 Contents of performance acceptance tests 2.5.1 Factory tests ◆ The seller is responsible for carrying out the necessary tests and inspections during production and before transportation, and shall submit the test reports to the buyer, who has the right to attend. And overall project testing is also provided. ◆The materials are tested in accordance with standards, and the test results are submitted to the buyer for approval; the seller provides certificates of conformity for all materials used in manufacturing the equipment. The selected materials must obtain the buyer’s approval before manufacturing. 2.5.2 Field Testing ◆ The buyer shall conduct performance acceptance tests after the equipment has been fully installed, in accordance with the acceptance standards. ◆During the performance acceptance tests, the seller shall send personnel to the site to assist and guide in addressing the defects identified during the tests until compliance is achieved. ◆If the buyer has special requirements, further discussions can be held (in accordance with the commissioning outline provided by the buyer). ◆The seller shall provide the measurement points, primary components, and local instruments required for the performance acceptance tests, with the participating parties providing cooperation (the seller shall offer technical and personnel support necessary for the tests). 2.6 Costs for performance acceptance testing. ◆Costs such as cooperation for the seller’s tests are already included in the total contract price. Other costs, such as those incurred if testing is carried out on-site, shall be borne by the buyer ； If it is carried out at the seller’s factory, it is already included in the total contract price. 2.7 Confirmation of the results of performance acceptance tests. The performance acceptance test report is primarily prepared by a third party, with the participation of both the buyer and the seller, who jointly sign to confirm the findings. If the two parties disagree on the test results, they shall resolve the issue through consultation. During the performance acceptance test, if one party receives notification from the other party but fails to send anyone to participate in the test, it shall be deemed as consent to the results of the acceptance test, and confirmation shall be provided by signing and stamping. 3. All factory tests and inspections carried out by the seller must be accompanied by test reports and records; the instrumentation and equipment provided shall also come with test reports and records, which must ultimately be handed over to the buyer. 4. The arrival inspection only covers the verification of the quantity of goods, their appearance quality, specifications and models, as well as the accompanying documents. 5. The seller shall, at the time specified in the buyer’s written notice, conduct an arrival inspection together with the buyer, the supervisor, and the construction/installation unit. If the seller fails to arrive at the specified time, it shall be deemed that the seller agrees to allow the buyer to conduct the inspection on their own and acknowledges the results of such inspection. 6. After the arrival of the goods and verification that they meet the requirements, the buyer will arrange for performance tests to be carried out (such as voltage resistance tests and sealing tests). Both parties will inspect all the goods (or conduct sampling in accordance with ** and relevant industry standards), and send them to relevant quality inspection agencies recognized by both parties for testing. 7. A successful random inspection of the goods’ performance shall not be considered as proof that the performance of all goods in that batch is satisfactory. 8. After the installation and commissioning of the instrumentation equipment, the technical parameters obtained from on-site testing must meet the requirements specified in the technical agreement and relevant industry standards. The acceptance of the goods is carried out during the commissioning acceptance of the installation. A successful vehicle test does not exempt the seller from its liability for the quality of the goods. XIII. Quality Assurance ◆ Quality assurance system: ISO9001, measures such as quality assurance for raw materials, quality assurance during the production process, quality assurance for finished products, and quality assurance for after-sales service. Provide a manufacturing schedule. ◆The device’s calculation results ensure the correctness of all calculations as well as the accuracy of the selection made. ◆The seller bears full responsibility for the quality of the products provided and their technical specifications. The seller guarantees that all products supplied are those that have passed testing, and the seller assumes full responsibility for any failures resulting from defects in the product’s design, materials, or manufacturing process. And issue a quality testing and inspection report with the corresponding qualifications. ◆The seller guarantees that the products supplied are brand new, fully meet the quality specifications and performance requirements specified by the buyer, and are entirely suitable for the natural conditions at the user’s site. The seller shall ensure that its equipment maintains satisfactory performance throughout its service life, under conditions of proper installation, normal use, and maintenance. ◆After the installation and commissioning of the instruments are completed and the conditions for acceptance are met, the buyer shall organize relevant personnel to conduct the acceptance. The stability and accuracy of operation of the metering equipment provided by the seller must meet the technical requirements and relevant specification standards. Compliance with relevant **acceptance criteria and industry standards. ◆The warranty period is 12 months after the installation is put into operation, or 18 months after the goods pass the on-site inspection, whichever comes first. ◆During the warranty period, if the equipment malfunctions, the seller is responsible for repairing it free of charge until it is replaced ； ◆The seller shall provide details regarding the maintenance center. ◆ The seller should clarify its maintenance capabilities, in particular whether it has the ability to carry out repairs and maintenance in the Zhuhai area. ◆The seller guarantees to respond to the issues raised by the user within 8 hours of receiving a phone call (fax), and to continue doing so until the problems are resolved. If the user requests it, the seller’s personnel will arrive at the site within 72 hours; if they fail to arrive on time, the seller shall cover the costs of repairs carried out by the user. Changhui Instrument Manufacturing Co., Ltd. provides customers with a free technical support phone number at 0871-65127691, and commits to offering comprehensive and timely after-sales service. When users encounter major technical issues that affect production, ensure that qualified technical personnel arrive at the user’s site within 48 hours, provided that both parties have the conditions for on-site service. ◆The seller guarantees a spare parts supply period of 5 years (or 5 years after the cessation of production) for all instruments and components listed in the supply list. XIV. On-site Services and Training 1. On-site Inspection: Once the goods have been manufactured, the seller shall notify the buyer in writing at least one week in advance. Upon the arrival of the equipment at the site, the seller will send a dedicated person to conduct the inspection together with the buyer ； If the seller fails to show up upon receiving the notice, it shall be deemed that they accept the buyer’s inspection report. 2. On-site installation: The buyer is responsible for on-site installation. The seller shall sign to confirm the quality of the installation in order to ensure the smooth operation of the instrumentation equipment and compliance with the installation requirements, and shall be responsible for commissioning it to meet the final inspection requirements and operational requirements. 3. Training (Instructions): ① The seller is responsible for providing systematic training to the technical personnel assigned by the buyer regarding the installation, commissioning, and maintenance of the products it supplies. The goal is to enable one to understand the principles of the equipment, its structure, and its performance; to be able to operate it, carry out maintenance on it, troubleshoot problems, and handle accidents. ②During the project implementation phase, the seller shall provide free training on the hardware, software, and configuration of the instrumentation equipment for 1 person, with a total training time of 1 working day conducted in one session, along with relevant training materials. The training costs are included in the total contract price (training duration: to be determined by the buyer; training location: the buyer’s site). 15. Delivery of Documents 1. List of supply scope (paper version + electronic version) ； 2. Instrumentation diagram (paper version + electronic version) ； 3. Return the detailed data sheet, installation drawings, and all materials required by the designer for the design (both in paper and electronic format) within 2 weeks of signing the contract ； 4. List of spare parts ； 5. List of randomly supplied vulnerable parts and list of special tools ； 6. Specification sheet ； 7. Contents of the instrument nameplate ； 8. Material (outsourced parts) purchase contract ； 9. All final documents and materials shipped with the equipment include: ◆ List of instrumentation equipment, list of accompanying tools and spare parts, list of technical documents ； (Paper version) ； ◆Detailed installation instructions and drawings for instrumentation equipment ； (Paper version + electronic version) ； ◆Certificates of conformity for instrumentation equipment and major accessories, along with relevant performance test reports (including product quality certificates, test reports, certificates of conformity, explosion-proof certification, and safety certificates) ； ◆All products (including any attached accessories) must be provided with a certificate of origin ； ◆Product samples and manuals for instrumentation equipment, as well as materials and drawings related to installation and commissioning, operation and maintenance, and operation manuals (paper + electronic versions) ； ◆Third-party product samples and manuals, as well as materials and drawings related to installation and commissioning, operation and maintenance, and operation guides (paper + electronic versions) ； ◆All textual materials must be in **standard Chinese characters ； 16. Contact Information: This section includes the company names, addresses, postal codes, phone numbers, fax numbers, as well as the names and mobile phone numbers and email addresses of the specific contacts from the buyer, seller, and design agency. In conclusion: It is not necessary to follow the provisions of this technical agreement for single-crystal silicon pressure transmitters and single-crystal silicon differential pressure transmitters strictly in every project; the contents and details of the pressure transmitter technical agreement should be adjusted by retaining, adding, or removing elements as appropriate based on actual circumstances. Source: http://yunrun.com.cn/tech/2377.html