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2. JJF (Chuan) 159-2018 Online Calibration Specification for Liquid Flowmeters
JJF (Chuan) 159-2018 "Online Calibration Specification for Liquid Flowmeters" is a local metrological technical specification for online calibration of liquid flow meters in Sichuan Province, which specifies calibration conditions, items, methods, result processing, and other requirements.
1. Standardize core information 1 Basic Information • Name: Online Calibration Specification for Liquid Flowmeters • Number: JJF (Chuan) 159-2018 • Nature: Local Metrology Technical Specification of Sichuan Province • Implementation Date: November 20, 2018 2 Scope of Application: This specification applies to online calibration of liquid flow meters (such as electromagnetic flow meters, turbine flow meters, ultrasonic flow meters, etc.) used in closed pipelines, and is not applicable to mobile calibration and initial calibration of flow meters.
II. Overview of Online Calibration Methods The standard table method is mainly used for online calibration, which compares the reading of the tested flowmeter with that of the standard table under the same flow conditions by connecting a high-precision standard flowmeter (standard table) in series or parallel.
.III. Main Calibration Items and Requirements | Calibration Items | Main Technical Requirements | |: ------------------------------------------------------------------------. ||Sealing inspection | There is no leakage at the installation connection. ||Indication error | Select at least 3 flow points for calibration within the flow range of the flowmeter. The indication error can be calculated using the formula: indication
IV. Calibration Requirements • Environmental Conditions: Environmental parameters such as temperature and humidity should be within the normal operating range of instruments and standards, and recorded.
. Installation conditions: The requirements for the straight pipe sections before and after the flowmeter should be met to ensure stable fluid flow. Standardization requirements: The expanded uncertainty (k=2) of the standard flow meter should not exceed one-third of the absolute maximum allowable error of the tested flow meter. After the calibration is completed, a calibration certificate or report should be issued, including the indication error, repeatability, and uncertainty of the calibration results for each flow point. If the calibration result meets the relevant requirements, it can be judged as qualified. Otherwise, adjustments, repairs, or restricted use instructions should be given. 6、 Important note: This specification is a local standard mainly used in Sichuan Province to guide the online calibration activities of liquid flow meters. When conducting calibration, it is necessary to strictly follow safety operating procedures, especially when dealing with high temperature, high pressure, flammable, explosive or toxic media, detailed safety plans must be developed.
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