Current position > Product detail
『Guangdong flowmeter calibration』Related information(v cone flow meter|rotary gas meter|gallon meter|gear meter|metal tube rotameter|glass tube rotameter|nutating disk meter|transit time ultrasonic flow meter|wedge flow meter|pd meters|hydraulic flow meter|ultrasonic water flow meter|water flow meter|air flow meter|magnetic water flow meter|oxygen flow meter|gas flow meter|argon flow meter|air velocity meter|gasoline flow meter|fuel flow meter|ultrasonic water meter|digital water meter|nitrogen flow meter|solid flow meter|Oxygen tank flow meter|digital water flow meter|diesel fuel flow meter|steam flow meter|02 flow meter|compressed air flow meter|oil flow meter|liquid flow meter)
1. What are the operating steps for non dismantling calibration of gas flow meters?
Non dismantling calibration of gas flow meters (i.e. online calibration) must strictly follow the current national metrological verification regulations such as JJG 633-2019 "Gas Volumetric Flowmeters". The standard operating process is divided into three core stages: preliminary preparation, on-site verification, data verification, and archiving, and can only be carried out by professionals holding metrological verification qualifications.
1. Preliminary Preparation 1 Qualification and working condition confirmation: Check the valid calibration certificate and nameplate parameters (range, accuracy level, medium type) of the gas flowmeter in use, select a non removable calibration device that matches the range (such as portable standard gas flowmeter, pressure stabilizing module), and ensure that the calibration equipment is within the calibration validity period
2. Safety risk control: Apply for on-site work permit, check pipeline leakage points, reduce the pressure of the tested pipeline to the low-pressure working condition allowed for calibration (usually 30%~50% of the rated working pressure), close the downstream non essential gas end, do a good job in pipeline isolation protection, and strictly prohibit open flames on site
Calibrate the device to avoid interrupting the normal gas supply process.
2. On site verification 1 System preheating and stabilization: Turn on the gas supply unit of the calibration device, adjust the pipeline pressure to the actual operating pressure of the measured flow meter, preheat the calibration equipment to a stable state where the ambient temperature deviation does
Allow an error of ± 1%) to determine whether the calibration result is qualified.
III. Data Verification and Archiving 1 Error Review: Compare the indication error data before and after calibration to confirm that there are no abnormal fluctuations during the calibration process. If the error exceeds the allowable range, mark the flowmeter and arrange for disassembly and re inspection. 2. Record and Ledger Update: Complete the "Gas Flow Meter Online Calibration Record", including calibration date, equipment number, flow point data, error value, and calibration personnel qualification information, and synchronize and update the new enterprises measurement equipment ledger.
2. Is the calibration certificate for gas user flow meters acceptable?
The calibration certificate for gas user flow meters can be used, but it must be issued by a qualified institution.
. 1. The core requirement is that calibration institutions must have CNAS (China National Accreditation Service for Conformity Assessment) qualifications in order for the certificates issued by them to have credibility. For example, Guangdong Shitong Instrument Testing Service Co., Ltd. is a third-party formal laboratory recognized by CNAS, and its report complies with the ISO/IEC 17025:2005 standard. 2. Service process: Send the flowmeter to the institution for inspection and calibration, and usually complete the calibration and issue the certificate within 2-3 working days. • On site calibration: If the user is unable to submit for inspection, some institutions provide on-site services, and metrology personnel will be present within 24 hours for equipment calibration and debugging.3. The certificate is valid and c