Help instrument engineering construction steps and content

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The question you asked sounds very complicated. I suggest you find a set of construction organization design from a regular construction unit and study it carefully. You will understand a lot.

Professional Construction Plan for Instruments 1 General Provisions ⑴ Before installation of instruments, the model, specifications and materials should be checked against the detailed engineering design drawings. The accessories of the instrument should be complete, the appearance should be intact, and there should be relevant information such as factory certificate, installation and operation instructions. Individual debugging and testing should be carried out before the instrument is installed. ⑵ When installing on-site instruments, unless otherwise specified, the distance between the center of the instrument and the ground should be 1.2M. ⑶ The instrument should be installed in a place free from mechanical vibration, away from electromagnetic fields and high-temperature equipment and pipelines, and should avoid erosion by corrosive media. The instrument should not be subject to knocks or vibrations during installation. The installation should be firm and straight, and should not bear piping or any other external force. ⑷ Instruments or measuring components installed on the process pipeline should be removed during pipeline purging and then reinstalled after the purging is completed. The arrow on the instrument housing should be consistent with the flow direction of the pipe medium. ⑸ For instrument equipment with special installation requirements, installation instructions should be strictly followed. ⑹ Necessary protective measures should be taken after the field instruments are installed. 2 Work Process Operation Instructions ⑴ Instrument pipeline construction 1. The purpose is to clarify the technical requirements and construction procedures, guide the construction, and ensure the construction quality. 2. Compilation based on Industrial Automation Instrument Engineering Construction and Acceptance Specification GB50093-2002 3. Construction steps 4. Operating procedures and technical requirements Serial number Construction process control points Technical requirements and quality standards 1 Material acceptance Material acceptance materials should have product certificates and meet the requirements of the design and specifications. 2. There should be no obvious deformation or damage in the appearance of prefabricated pipelines. Clean the inside of the pipe, and the pipes that need to be degreased should be laid after passing the degreasing. 3 The pipeline laying design requires construction according to the design drawings and shall not be changed at will. Pipe laying ① The bolts and gaskets used for flange connection should comply with the design requirements. ② The location of valves, flanges and weld beads on the pipeline should be considered for convenience in construction and production and maintenance. ③ When the air supply duct is a galvanized steel pipe, it should be connected with threads, and it must be purged and airtight tested before use. ④ The installation of heating pipelines should avoid the generation of fluid accumulation, and U-shaped expansion elbows should be installed for long-distance straight installations. ⑤ Instrument pipelines must be welded by welders with valid certificates and use correct welding materials. ⑥ The instrument pressure guiding pipe and air source pipe should strictly follow the slope required by the design. ⑦ Instrument pressure pipes, gas source pipes, and heating pipes must be cut with a pipe cutter, and gas cutting is strictly prohibited. ⑧ The installation of the instrument bracket must strictly comply with the regulations of GBJ93-86. ⑨ The measuring pipeline needs to have a certain slope ⑩ (1: 10~1: 100), pay attention to the installation direction of one-way valves, stop valves, traps, and filters. ⑾ Welding of galvanized steel pipes is strictly prohibited. 4 Pipeline Pressure Test Pressure Test ① Measuring pipelines, heat tracing and wires must undergo strength tests. The test pressure liquid is 1.25 times the design pressure. When the test pressure is reached and the pressure is stopped for 5 minutes without leakage, it is qualified. The test pressure gas is 1.15 times the design pressure. After the pressure is stopped for 5 minutes, the pressure drop value is less than 1% of the test pressure. The test pressure is qualified. ② Clean water should be used for hydraulic tests, and air or inert gas should be used for pneumatic tests. ③ The accuracy of the test pressure gauge is ≥1.5. ⑵ Instrument System Debugging Operation Instructions 1. Purpose: Clarify technical requirements and construction procedures, guide construction, and ensure construction quality. 2. Compilation based on industrial automation instrument engineering construction and acceptance specifications GB50093-2002 3. Construction steps 4. Operating procedures and technical requirements Serial number Construction process control points Technical requirements and quality standards 1 The standard instrument used for calibration of inspection instruments and equipment should have a certificate of conformity, and the absolute value of the basic error should not exceed 1/3 of the meter being calibrated. 2. Sub-project inspection ① Instrument adjustment personnel should be familiar with the instrument instructions and prepare necessary testing instruments and tools. ② Instrument debugging work needs to be supervised by the owner. 3 Internal adjustment Internal adjustment ① The test of the DCS system itself in the control room includes hardware testing, communication inspection, functional configuration, PID setting, and alarm. ② Cabinet wiring and general instrument system testing in the control room. 4 External adjustment External adjustment ① System debugging includes detection loop debugging, regulating loop debugging, interlocking and alarm loop debugging. ② Inspections should be carried out before instrument debugging, and relevant technicians should participate in the joint debugging of equipment related to mechanical equipment, electrical, and process expertise. 5 Joint debugging ① DCS system configuration, downloading, start-up and shutdown must be managed by dedicated personnel, and debugging records must be filled in with true, complete and timely feedback. ② The system debugging results shall be signed and approved by the owner’s representative. 3 Level meter installation 3.1 The glass plate liquid level meter should be installed at a location that is convenient for observation, maintenance and disassembly. The liquid level meter should be installed vertically, and the allowable deviation of the verticality is 5/1000. 3.2 The installation height of the differential pressure liquid level transmitter should not be higher than the pressure port at the bottom of the liquid level, but this restriction is not required when using a flange-type differential pressure transmitter to measure liquid level. 3.3 Protection measures should be taken when laying the capillary tube of the flange type differential pressure transmitter. The bending radius should be greater than 50mm. The ambient temperature of the installation site should not change too much. Otherwise, heat insulation measures should be taken. 4 Installation of temperature instruments 4.1 The installation location of the temperature primary point should be selected in a place where the medium temperature changes sensitively and is representative according to the design requirements. 4.2 The temperature measuring element should be perpendicular to the center line of the pipeline or at an angle of 45°, and the installation location of the thermocouple should be away from the magnetic field. If the temperature primary component is installed at a bend or tilt in the pipeline, it should be against the flow direction or vertically. 4.3 The insertion depth of the temperature measuring element should comply with the design specifications. 4.4 When the nominal diameter of the pipe is less than 80mm, it can be installed at the elbow or enlarged pipe. 5 Installation of flow meter 5.1 The flow meter must be installed on a straight pipe without vibration. 5.2 The length of the upstream straight pipe section should not be less than 5 times the diameter of the process pipe. The length of the downstream straight pipe section should be 2.5 times the diameter of the process pipeline, and the inner wall of the pipeline should be smooth. 5.3 When the amplifier and flow meter are installed separately, the distance between them should not exceed 20mm, and the signal connection should be a metal shielded wire. 5.4 The flow meter, the measured medium and the process pipeline should be connected to equipotential and grounded. 6 Installation of DCS system 6.1 Check the installation conditions of the DCS system according to the design requirements or the manufacturer's instructions. Installation can only be done after the indoor temperature and humidity reach the corresponding requirements. 6.2 The DCS cabinet is installed in place using a manual hydraulic trailer. It is strictly forbidden to hit directly with a hammer during the installation and alignment of DCS cabinets. 6.3 The installation of DCS cabinets should ensure that the front joints of two adjacent identical cabinets are no more than 2mm, the flatness of the front joints is no more than 1mm, the top height error is no more than 2mm, and the verticality deviation of a single cabinet is no less than 5/1000. 6.4 When using bolts to fix the bottom lever and basic steel of the cabinet, use a 500V megohmmeter to measure the insulation of the cabinet shell to the ground. The resistance value shall not be less than 5 megohms. 6.5 The DCS system's protective ground, the setting of the grounding body for the working connection and its grounding resistance value are strictly in accordance with the design requirements or the manufacturer's instructions. If there is no special instruction, the protective grounding resistance is generally less than 4 ohms. The working grounding resistance is less than 1 ohm. 6.6 The working grounding and protective grounding of the cabinet are first connected to the bus copper bars of the working grounding and protective grounding with multi-core copper wires of no less than 16mm2, respectively, and then multi-core copper wires larger than 25mm2 are used to centrally lead them to their respective grounding electrodes. The grounding wires are all crimped with silver-plated cold-pressed terminals, and then galvanized bolts are used to connect to the bus copper bars. 6.7 The power supply of DCS shall be constructed strictly according to the design drawing, and isolation measures shall be taken. 6.8 The installation of accessories and communication cables in the cabinet must be installed by the DCS system manufacturer. 7 Cable line laying 7.1 Cable laying shall be carried out in accordance with the requirements of the specifications, and inspections and prescribed preparations before laying shall be carried out. Construction shall be carried out in layers and zones in the bus trough, and attention shall be paid to the influence of ambient temperature and humidity. 7.2 Joints and intermediate joints and protective measures, DCS system cables, fiber optic cable laying, network cable laying, etc. must meet the specification requirements. 7.3 Before use, the appearance, continuity inspection and insulation test of instrument cables and wires should be carried out in accordance with the specifications. The resistance between the cable core wires, the cable core and the outer protective layer, and the insulation layer should be accurately tested. Use a 100V megger to measure the resistance value of not less than 5MΩ and keep records. 7.4 The following preparations should be carried out before laying cables: ⑴ Conduct actual measurement of part of the laying length. The actual length should be basically consistent with the design length. Otherwise, a cable distribution table should be prepared based on the actual measured cable laying length and cable arrival length. ⑵ According to the on-site cable distribution situation and the cable distribution table, the cable laying sequence is arranged according to the principle of far first, then close, first concentrated and then dispersed. ⑶ The first and last ends of the cable should be hung with design-specified marking numbers. 7.5 Cables should be laid centrally. During the laying process, a dedicated person must be under unified command, and lifting, welding and other operations above the cable trough or bridge should be stopped. After the cable laying is completed, the cover plate should be added in time to avoid mechanical damage and burns to the cable. 7.6 Cables with different signals, different voltage levels and intrinsically safe explosion-proof systems should be laid in zones in the bus trough and in layers on the bridge. 7.7 Cables should have margins at corners, ends, expansion joints, thermal compensation sections, and earthquake-prone locations. 8 Air source pipeline 8.1 Before installing the branch pipe, clean the internal and external surfaces of the pipe and fittings. 8.2 The connection between the branch pipe and the main pipe shall be threaded. The connection between the branch pipes shall be threaded regardless of whether the diameter is reduced or not. 8.3 A drain valve should be installed at the lowest point or end of each gas source branch pipe to discharge dirt and moisture. The position of the drain valve should not affect the process pipelines, process equipment and instrumentation equipment. 8.4 The gas source pipe must be installed horizontally and vertically, neatly and neatly, and cannot cross. The pipe must be firmly fixed on the bracket with pipe clamps. The distance between horizontally laid brackets is 1~1.5m, and the distance between vertically laid brackets is 1.5~2m. The distance between brackets on the same straight line segment should be uniform and there should be no obvious gap. 8.5 Carry out pressure testing and purging according to the requirements of the instrument construction specifications. 9 Cable (wire) protection tube 9.1 The pipe opening and pipe connection should be sealed, and the pipes should be connected with threads. If they are buried underground, anti-corrosion work must be done. Pipe fittings in explosion-proof areas shall comply with design requirements and comply with explosion-proof requirements. 9.2 The bend of the protective tube must be greater than 90 degrees, otherwise the threading will be affected. The electrical protection tube must be deburred before use, especially after threading, the burrs must be removed from the tube opening. 9.3 The protective pipes should be laid horizontally and vertically, neatly and beautifully, without crossing, and the spacing should be equal. The spacing between conduit brackets should be 1 to 1.5m horizontally and 1.5 to 2m vertically. In the same straight line segment, the spacing between brackets should be roughly even. The protective pipe is laid 0.2m below the hot water pipe and 1.0m below the steam pipe. 9.4 When the pipe is laid straight through, a wiring box must be added if it exceeds 30m. 10 Calibration and adjustment of single instrument equipment ⑴ Adjustment room requirements The adjustment room should be clean, quiet, with sufficient light or good lighting, the indoor temperature should be between 10 and 35°C, the relative air temperature should not be greater than 85%, and there should be no corrosive gases. The power supply for instrument adjustment should be stable. The air source used for instrument adjustment should be clean and dry, with a dew point at least 10°C lower than the lowest ambient temperature. The air source pressure should be stable and the fluctuation should not exceed 10% of the rated value. ⑵ Standard instruments and instruments used for adjustment should have valid identification certificates, and the absolute value of their basic error should not exceed 1/3 of the absolute value of the basic error of the instrument being calibrated. ⑶ During the unpacking inspection of the equipment, check whether the outer packaging is damaged and whether the packaging is intact after unpacking. During the unpacking inspection, the equipment should be checked one by one according to the packing list and meet the requirements. ⑷ The contents and requirements for instrument appearance inspection are as follows ① The model, specification, material, measuring range, dial, etc. of the physical nameplate should meet the design requirements. ② There should be no deformation, damage, fixed parts, etc., complete accessories, and complete certificates and calibration certificates. ⑸ Instrument performance verification and adjustment ① The calibration points of the instrument should be selected evenly across the entire scale, and no less than 5 points should be used for single calibration. ； ② The basic error of the instrument being calibrated should not exceed the allowable error of the instrument’s accuracy grade. ； ③ The variation of the instrument being calibrated should not exceed the allowable error of the accuracy level of the instrument. ； ④ The zero position of the instrument being calibrated is correct, and the offset value should not exceed 1/2 of the allowable deviation. ； ⑤ The pointer of the instrument to be calibrated should be free of jitter, friction and jumping during the entire process. ； ⑥ Adjustable devices such as the potentiometer and adjustable screws of the instrument being calibrated should still have room for adjustment after adjustment. ； ⑦ Spring tube pressure gauges and bimetal thermometers need to be re-sealed after being unsealed and adjusted due to out-of-tolerance indications. ； ⑧ After the instrument passes the calibration, the calibration certificate should be promptly affixed and the calibration record should be filled in. ； Verification records require authentic data and clear writing ； Calibration records and verification certificates should be dated and signed by the appraiser. ； ⑹ The calibration and adjustment of temperature instruments, pressure instruments, flow instruments, liquid level instruments, pressure/differential pressure transmitters, analytical instruments, regulating valves, and DCS are carried out in accordance with construction specifications, standards, design instructions, and SECCO's relevant standards. 11 Instrument system test (1) General provisions (1) After the instrument project is installed, adjusted, piping and wiring, and before it is put into operation, the system test can be carried out if the following conditions are met. ① When all the instrumentation and equipment are installed and debugged successfully and the specifications and models meet the design requirements ； ② The primary components are installed in a reasonable position, the pressure pipes, protective pipes and other pipelines are all completed, installed correctly, and the pressure test is qualified. ； ③ Pneumatic pipelines must be purged, pressure tested, passed the air tightness test, and connected to a qualified instrument air source. ； ④ The electrical circuit has been calibrated and insulation checked. The wiring is correct, the terminals are firm and the contacts are good. ； ⑤ The grounding system is intact and the grounding resistance meets the design requirements. ； ⑥ The electrical major has passed the debugging, and the interface with the electrical major is ready to receive and output signals. ； ⑦ The setting of each process parameter has been confirmed ； ⑧ The DCS system in the main control room meets the conditions for joint school ； ⑵ The system test shall be debugged separately according to the detection and adjustment system, alarm system, and interlocking protection system to meet the conditions for commissioning. If the test is qualified, the system test record shall be filled in and Party A's relevant process operators shall jointly confirm on-site and sign on the technical documents. (ii) Detection system test ⑴ Input analog signals (voltage, resistance, frequency, etc.) at the signal generating end of the detection system, check the PV display value on the CRT display screen of the operating station, and calculate the system error. The error value should not exceed the square root value of the sum of the squares of the basic errors allowed by each unit instrument in the system, as shown in the following formula: ΔB＝√(ΔA1)2+(ΔA2)2+(ΔAn)2 Where: ΔB——system tolerance of the detection system ； ΔA1...ΔAn - the allowable basic error of unit instruments in the system. ⑵ The system calibration points shall be no less than three points, which are 0%, 25% and 100% of the design range. ⑶ The detection system with an alarm point should also check the alarm function on the CRT display screen of the operating station to confirm that the range of the number and the alarm value are consistent with the design, increase or decrease the input signal, check whether the alarm action is normal, whether the alarm whistle sounds, and whether there is an alarm information displayed on the alarm overview screen. (iii) Adjustment system test ⑴ The action direction of the regulator and actuator. ⑵ Set the regulator output to the manual state on the CRT display screen of the operating station, and output the 4-20mADC signal manually. Check that the full-stroke action of the on-site actuator from the starting point to the end point and the action of the echoer should be good and the accuracy is qualified. If there is a valve positioner, check it together with the valve positioner. Also confirm that the color of the corresponding valve on the flowchart screen changes. The base panel control system uses the output signal of the manual operating system to perform the above checks. (IV) Alarm system test (cooperated) ⑴ The signal input components in the system, such as pressure switches, temperature switches, liquid level switches and additional alarm mechanisms of various instruments, should be parameter-tuned according to the set values ​​provided by the design. The set values ​​must not be changed at will. When modifications are necessary, documents approved by the design are required. ⑵ According to the circuit schematic diagram, provide the system's action status table. When all lines are connected, input the measurement signal point by point. The PV status of the corresponding number on the CRT display screen of the operating station should be consistent with the input signal. At the same time, confirm that the alarm whistle sounds and the alarm information is displayed on the alarm overview screen. (5) Interlock protection system test (cooperated) ⑴ The interlock protection system is tested and inspected according to the logic diagram to ensure that the system is sensitive, accurate and reliable. ⑵ Automatic opening and closing of machinery, automatic opening and closing interlocking systems of valves and other execution machinery shall be subject to automatic interlocking tests after passing the manual test. ⑶ The manual test method is as follows:: For the field input points included in the entire logic loop, the method of simulating field conditions is used. Only one input point that can directly affect the state of the control output contact is selected for testing each time, and other relevant field input contacts in the loop are short-circuited or disconnected (short-circuiting or disconnection is determined according to normal production status). Short-circuit or disconnect the test points respectively to check whether the action of the output contact meets the designed interlocking function, and then conduct this inspection one by one on all input points that can affect the state of this output contact to verify the function, and then conduct this inspection on all input points that can affect the state of this output contact one by one to verify whether the mechanical equipment and valve shutdown (opening and closing) action signals and action times required by the entire logic loop meet the design requirements. After the test, the wiring should be restored as designed. ⑷ The automatic chain test operation is as follows:: The process operators will cooperate on-site to create a simulated production site. After each circuit of the instrument is put into normal operation, fault simulations will be carried out on-site one by one according to the logic diagram to check whether the on-site mechanical equipment and valve opening and closing (opening and closing) actions, action times, status displayed in the control room, and audible and visual signals meet the process requirements.

Thank you, I don’t know where these come from. Is there any book? 4# 110488654

This post was last edited by 110488654 at 2010-5-14 12:19. Our company system files are all the efforts of our seniors.

3. Construction procedures: bridge installation → air source pipeline laying → wiring pipe laying → cable laying → on-site instrument installation → panel installation → primary adjustment of instruments → line search → secondary adjustment → commissioning and operation. 4. Installation and construction methods 4.1 Bridge installation Bridge installation is the most basic and important link in instrument construction. Before installation, you should carefully discuss with the process technician to confirm that the bridge does not conflict with process pipelines and equipment, and can be kept away from thermal pipes and electrical bridges. The bridges should be installed horizontally and vertically, arranged neatly, and there should be a space for easy operation between the upper part and the ceiling (or floor). Finished elbows should be used when bending the bridge. The bridge is connected and fixed with smooth semi-circular head bolts. The nuts should be on the outside and the fixation should be firm. When opening holes directly on the bridge, mechanical processing methods must be used, and electrical welding must not be used. 4.2 Gas source pipeline laying Gas source pipelines generally use galvanized welded steel pipes. Standard galvanized pipe fittings shall be used for pipe connections and shall not be welded. The joints are sealed with hemp wire and lead oil. The gas supply main pipe should have a suitable slope and a drain valve should be installed at the end collection point. The drain valve should be installed away from electrical, instrument equipment, and wiring terminals and easy to operate. The outlet of the branch pipe on the horizontal main pipe should be above the main pipe. The gas source pipeline is fixed with galvanized U-shaped pipe clamps. 4.3 Installation of threading pipes The threading pipes should be galvanized pipes, and galvanized external joints should be used to connect the straight pipe sections. When the straight pipes are long and there are many elbows, union joints or wiring boxes can be added as appropriate. Pipe support installation should make full use of the on-site steel structure, beams and columns. The piping should be considered together with the gas source pipeline. The overall layout of the pipeline is required to ensure that it is far away from the heat source and does not hinder the process operation. The pipes should be arranged neatly, orderly and not messy. The connection between the protective tube and the detection component or field instrument shall be carried out according to the design requirements. The distance between pipe supports should not be greater than 1.5m, and for pipes with a diameter greater than 25mm, the distance between supports should not be greater than 1m. 4.4 The installation of the panel cabinet shall be based on the floor plan and the random drawings of the arriving panel cabinet. First, make a foundation, and weld several pillars under the foundation channel steel, and fix the pillars at the corresponding positions. The upper surface of the channel steel foundation is required to be basically flat with the floor. Just lay the panel cabinet on the foundation, align and level it, and then fix it. The installation of the instrument panel should be flat, vertical, and firm, and the vertical deviation shall not exceed 1.5mm/m. ； The inclination in the horizontal direction shall not exceed 1mm/m, and the gap between two adjacent panels shall not be greater than 2mm. 4.5 Cable laying starts from the main control room and ends at the site. Cables are laid along the bridge. Cables that are relatively close to the site can be placed together in the main control room. Once in place, mark the reserved length, cut it off and label it. Signal cables and power cables should be separated by partitions. The cables should be arranged neatly in the trough box, and the pipes should be threaded in time after the cables are placed. The bridge cover can be covered after the test run to ensure that there are no changes. 4.6 Check the line-to-line connection and connect the cable in time after passing through the pipe. When wiring, check the drawing first, and then wire according to the drawing after confirming it is correct. Special attention should be paid to the power supply line and signal line of the four-wire instrument. If the core wire is composed of a single strand wire, it can be connected directly to the terminal. Note that the bending direction of the wire is consistent with the rotation direction of the screw. For multi-strand core wires, wire lugs must be used. The wiring needs to be correct and firm, the number on the line is clear, and the wires are arranged neatly and beautifully. 4.7 Primary components installation The primary components on the pipeline should be installed and prefabricated at the same time as the process pipeline is installed. If the floor plan in the construction drawing is inconsistent with the process flow diagram, the flow diagram should prevail. The pressure source component should intersect perpendicularly with the axis of the process pipeline and be located where the medium flow is stable, away from expansion pipes, valves, elbows, etc. The temperature source component should be located where the medium flows, not in a dead corner area. The temperature sensing element of the thermometer should be on the center line of the pipeline. The temperature source component can be installed tilted, and it should be against the flow direction of the process medium when tilted. 4.8 Installation of instrument equipment Instrument equipment should be installed in a place that is easy to operate and does not hinder the process. It is required to be away from strong magnetic fields, strong vibrations and high temperature radiation. It is required to have sufficient lighting but avoid direct sunlight. The height of the instrument center from the ground should be 1.2-1.5m ； For double flange differential transformers, protective measures should be added to the capillary tube, the installation direction of the flow meter cannot be wrong, and the front and rear straight pipe sections should meet the design requirements. The installation of the regulating valve should ensure that the valve body is vertical, the height of the valve base from the floor is greater than 200mm, and there are no obstacles within 200mm above the diaphragm box. Regarding the installation of regulating valves, many steel-lined rubber-lined valves will be encountered in ion membrane projects, and care should be taken to protect them during installation. 4.9 Purge and pressure test The purge and pressure test are carried out simultaneously with the process. For equipment such as flow meters and regulating valves, remove them before purging and replace them with temporary short pipes. Install them again after purging and test the pressure together with the process pipelines. During the pressure test, all valves should be opened, and the pressure test requirements are consistent with the process. Air source pipelines and instruments are purged separately. During purging, disconnect the pipelines (pipe cables) before entering the meter to prevent dust from blowing into the instrument. During purging, blow the main pipe first and then the branch pipes. During the pressure test, the test pressure is 1.15 times the design pressure. 5. Instrument debugging 5.1 debugging: One-time commissioning can be carried out after the instrument arrives. For debugging, first find a quiet, vibration-free room as the debugging room. The debugging room requires stable power supply and air humidity not greater than 85%. The standard meter used for adjustment has a valid appraisal certificate, and the basic error of the standard meter is less than 1/3 of the basic error of the calibrated meter. For pressure and differential pressure instruments, plus the original pressure (differential pressure) signal, the output 4-20mA current signal corresponds to the input engineering signal one-to-one through zero adjustment and full adjustment. If a transmitter type is used as an intelligent instrument, zero adjustment and full adjustment are completed by setting the measurement range through the programmer and defining the input and output signals. For the thermal resistance of the temperature measuring instrument, the resistance box can be used to simulate it, and the thermocouple uses a millivolt signal generator to add the voltage signal to the input end of the display meter. After debugging the control valve and correctly connecting the lines and pipelines, send the input signal (4-20MA DC current) to the positioner, and make the valve position output indication (0-100%) correspond to the input current signal through zero adjustment and full adjustment. For on-off valves, control the on and off of the solenoid valve, and verify whether the valve can be fully opened and closed and the response speed. Special intelligent instruments, such as microwave level gauges and pH analyzers, must be calibrated according to the instructions. During an adjustment, if unqualified instruments are found, Party A should be notified promptly so that the problem can be dealt with as soon as possible. 5.2 Prepare separate installation and debugging plans for DCS and PLC systems. 5.3 System debugging System debugging shall be carried out after the host is debugged, instrument equipment is installed, cable laying and calibration wiring are completed, and the pressure test and leak test are passed. For the detection loop, the thermal resistance temperature measurement can use a resistance box to simulate the thermal resistance, plus the resistance corresponding to the measured temperature, to verify the accuracy of the engineering quantities displayed on the operating station. For thermocouple temperature measurement, the compensation wire needs to be disconnected in front of the control station terminal, and the millivolt level signal is directly added to the input terminal. Ordinary pressure (differential pressure) units must add the original pressure (differential pressure) signal. For the flange type transmitter, the transmitter circuit can be disconnected, connected to the resistance box and connected in series with the ammeter. By changing the resistance, the input module signal current changes within 4-20MA, and the instructions on the microcomputer can be checked. For four-wire transmitters (flow meters), a DC signal generator can be used to add signals to the input unit on site and check the instructions on the microcomputer. If the input is a switch value (on or off), check whether the indication status and logical relationship are correct. The adjustment loop debugging is divided into two parts: input and output. The input debugging method is the same as the detection loop debugging method. In the output part, set the corresponding PID to manual, adjust its output, and check the consistency of the actual output valve position indication and the display on the microcomputer. If there is a deviation, an ammeter must be inserted in the loop to find out whether it is a problem with the output template or the valve. The problem often comes from the regulating valve. If the valve is not correct, it needs to be recalibrated. At this time, the output template is used as the signal source. Adjust the positioner so that the valve position corresponds to the output.

I have the information, but I don’t know how to upload it, so I fainted. . . .

Can you send it to my email? Thank you. 81847979@qq.com.cn

Isn’t the 4th floor just the construction plan of the chemical construction? I don’t know which chemical version it is?