Instrument calibration, experimental procedures

Abstract: Instrument calibration and experimental procedure information are provided by excellent flowmeter and flowmeter manufacturers. The calibration and test of a single instrument is traditionally called a one-time calibration, that is, the calibration before the instrument is installed. with the corresponding reference standard. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following are the details of the instrument calibration and experimental procedures. The calibration and test of a single instrument is traditionally called a one-time calibration, that is, the calibration before the instrument is installed. A set of operations that relate to a corresponding magnitude determined by a reference standard. The calibration and test of a single instrument is traditionally called a one-time calibration, that is, the calibration before the instrument is installed. A set of operations that relate to a corresponding magnitude determined by a reference standard. The purpose is to check whether the score meter is damaged during transportation; check whether the specifications, models and functions of the meter meet the requirements of the design documents; whether the precision of the meter meets the requirements of the manufacturer's technical documents. Therefore, it is a job with high technical content, detailed work requirements and a wide range of work. The quality of this work will directly affect the system test and the product quality and operation safety of the device, and will have a significant impact on the evaluation of the construction quality of the instrumentation project. Due to the rapid development of the industrial automation instrument industry and the continuous emergence of new technologies and products, the calibration test work of a single instrument involves a very wide range, so this article is only for reference, and the specific operation should be determined by the specific situation of the unit. Main basis: 1. Engineering contract or agreement (specific to the document number); 2. Instrument design and construction drawings and other technical documents; 3. Technical documents provided by the instrument manufacturer; 4. 'Automation Instrument Engineering Construction and Acceptance Specifications'5 . Standard GBJ131-90 for quality inspection and evaluation of automatic instrument installation engineering; 7. Measures for the management of metrological verification personnel in the chemical industry. Construction process: 1. General regulations (1) Test environment conditions: The calibration and test of the instrument (excluding the actuator) should be carried out in the laboratory. The laboratory should have the following conditions: a. The room is clean, quiet, with sufficient light, no vibration, and no electromagnetic field interference to instruments and lines. b. The indoor temperature is kept at 10~35℃. c. The power supply voltage is stable, and the voltage fluctuation of the AC power supply and the DC power supply above 60V should not exceed±10%. DC power supply voltage fluctuation below 60V should not exceed±5%. d. The gas source should be clean and dry, the dew point should be more than 10°C lower than the minimum ambient temperature, the gas source pressure should be stable, and the pressure regulating facilities should be complete. (2) Standard instruments used for instrument calibration and testing shall have valid metrological verification certificates, and the absolute value of the basic error should not exceed 1/3 of the absolute value of the basic error of the instrument to be calibrated. (3) The conditions, items and methods of instrument calibration and testing shall meet the requirements of the manufacturer's technical documents and design documents, and shall use the special tools and test equipment provided by the manufacturer. (4) Personnel engaged in calibration and testing should have the corresponding qualifications and the verification certificate issued by the competent chemical department at or above the provincial level, and be able to master the operation skills of the test items proficiently, and correctly use and maintain the measuring instruments used. (5) The calibration points of a single instrument should be uniformly selected within the full range, generally not less than 5 points. (6) Appearance inspection of the instrument should be carried out before the calibration and test of the instrument, and its contents should include: a. The model, specification, material, explosion-proof level, etc. of the instrument should meet the requirements of the design document. b. There are no defects such as deformation, damage, paint peeling, missing parts, etc., and the main dimensions and connecting threads of the shape meet the design requirements. c. The nameplate signs, accessories and spare parts are complete. d. The product technical documents and quality certificates are complete. (7) After the instrument is calibrated and tested, it should meet the following requirements: a. The basic error and hysteresis should meet the allowable error of the instrument. b. The zero position of the instrument is correct, and the deviation value does not exceed 1/2 of the allowable error. c. The setting deviation of alarm and interlock does not exceed the allowable error of the instrument, and its setting value conforms to the requirements of the design document. d. The pointer has no jitter, friction and beating in the whole stroke. e. The adjustable parts should have room for readjustment. f. The digital display instrument has no flickering phenomenon. g. The marking or typing of the recording instrument should be clear, and the recording paper moves normally. The recording error meets the accuracy requirements of the instrument. (8) After the instrument calibration test, the calibration record should be filled in in time, and the data should be true, the items should be complete, the handwriting should be clear, the signature should be complete, and it should be pasted on the obvious position of the meter body.“Conformity”Identification and tagging. (9) The calibrated instruments should be properly kept according to the relevant requirements of the company's material storage procedures. Instruments that have been adjusted and failed to pass should be reported to the equipment planner and engineer, together with the supervisor, the owner and other relevant personnel for inspection and confirmation, and then returned to the warehouse for processing. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Instrument Calibration, Experimental Procedures'

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