Common calibration cycles and procedures for field instruments

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This post shares the calibration periods and calibration procedures for 17 common field instruments, including pressure gauges, paper recorders, thermocouples, thermal resistors, pressure transmitters, electromagnetic flowmeters, bimetallic thermometers, and pressure controllers. The regulations regarding these calibration periods are derived from SY/T6069-2005 \"Technical Specifications for the Operation of Instrumentation and Automation Systems in Oil and Gas Pipelines\". ◆Calibration regulations for spring tube precision pressure gauges: JJG4-2013 \"Calibration Regulations for Precision Pressure Gauges and Vacuum Gauges with Elastic Elements\"; these regulations are applicable to the calibration of spring tube precision pressure gauges and vacuum gauges. The maximum calibration period for spring tube type precision pressure gauges is 1 year. ◆ For spring tube type general pressure gauges, the metrological calibration regulations are JJG52-2013 \"Spring Tube Type General Pressure Gauges, Pressure Gauges, Vacuum Gauges and Vacuum Manometers\"; these regulations apply to the calibration of spring tube type general pressure gauges, as well as pressure gauges and vacuum gauges. The maximum calibration period for spring tube-type general pressure gauges is six months. For the calibration period of field instruments, please visit yunrun.com.cn/tech/2673.html. ◆ Automatic balance type display instruments: The metrological calibration regulations are JJG74-2005 \"Industrial Process Measurement Recorders\"; these regulations apply to the calibration of automatic potentiometers, automatic balance bridges, and mechanical recorders. The maximum calibration period for automatic potentiometers, automatically balanced bridges, and mechanical recorders is six months. ◆ Glass liquid thermometers for use in operations: The metrological calibration regulations are specified in JJG130-2011 “Glass level thermometers for use in operations”. These regulations apply to the calibration of both ordinary and precision thermometers used in industrial and experimental settings; the maximum calibration period for such thermometers is one year. ◆ Velocity-type flowmeters: The metrological calibration regulations are specified in JJG198-1994 “Velocity-type flowmeters”. These regulations apply to the calibration of flowmeters with accuracy classes of 0.1, 0.2, and 0.5, as well as vane-type flowmeters. They also apply to turbine, vortex, helical vortex, and electromagnetic flowmeters with accuracy levels below 0.5, as well as ultrasonic and laser Doppler flowmeters with accuracy levels below 0.5. The maximum calibration period for flowmeters with accuracy classes of 0.1, 0.2, and 0.5, as well as vane-type flowmeters, is one year ； For turbines, vortex street meters, swirl vortex meters, and electromagnetic flowmeters of class below 0.5, the maximum calibration interval is 2 years ； For ultrasonic and laser Doppler flowmeters with a precision of 0.5 level, the maximum calibration interval is 3 years. ◆ Bimetallic thermometers: The metrological calibration regulations are specified in JJG226-2001 “Bimetallic Thermometers”. The maximum calibration interval for bimetallic thermometers is 1 year. ◆ Industrial platinum and copper thermistors: The metrological calibration regulations are outlined in JJG229-2010 “Industrial Platinum and Copper Thermistors”. These regulations apply to the calibration of industrial platinum and copper thermistors with a precision better than 0.5 level; the maximum calibration interval for such thermistors is 1 year. ◆ Industrial alloy thermocouples: The metrological calibration regulations are specified in JJG351-1996 “Industrial Alloy Thermocouples”. These regulations apply to the calibration of K, N, E, and J type thermocouples. The maximum calibration interval for these types of thermocouples is half a year. ◆ Zirconia oxygen analyzers: The metrological calibration regulations are given in JJG535-2004 “Zirconia Oxygen Analyzers”. The calibration interval for zirconia oxygen analyzers should be determined by individual organizations based on the performance of the zirconia sensors; no standard specifies a fixed calibration interval for such analyzers. ◆ Pressure controllers: The metrological calibration regulations are specified in JJG544-2011 “Pressure Controllers”. These regulations apply to the calibration of pressure controllers (switches) and vacuum controllers (switches). The maximum calibration interval for pressure controllers is 1 year. ◆ Digital temperature indication regulators: The metrological calibration regulations are specified in JJG617-1996 “Digital Temperature Indication Regulators”. These regulations also apply to digital indication regulators that receive input signals in the form of DC analog signals. The maximum calibration interval for digital temperature indication regulators is 1 year. ◆ Differential pressure flowmeters: The metrological calibration regulations are specified in JJG640-2016 “Differential Pressure Flowmeters”. These regulations cover the calibration of throttling devices or sensors using geometric testing methods and coefficient methods, as well as the calibration of standard nozzles used for measuring single-phase clean fluids using geometric testing methods. They also cover the calibration of differential pressure gauges or transmitters used in differential pressure flowmeters. The maximum calibration interval for throttling devices or sensors using geometric testing methods and coefficient methods is 2 years ； The maximum calibration period for standard nozzles used to measure single-phase clean fluids, as determined by the geometric inspection method, is 4 years ； For differential pressure flowmeters, the maximum calibration interval for the differential pressure gauge or transmitter is 1 year. ◆ Calibration regulations for liquid volume flowmeters: JJG667-2010 \"Liquid Volume Flowmeters\"; these regulations apply to gear, paddle, and other types of flowmeters used for trade settlement, as well as to flowmeters that operate under harsh conditions and have an accuracy level better than 0.5 grade. The maximum calibration interval for gear, paddle, and other flowmeters used for trade settlement is half a year ； For flowmeters used in harsh conditions and of grade better than 0.5, the maximum calibration interval is six months ； The maximum calibration period for other flowmeters is 1 year. ◆ Operating vibration meters: Metrological calibration regulations: JJG676-2000 “Operating Vibration Meters”. The maximum calibration period for operating vibration meters is 1 year. ◆ Combustible gas detection and alarm devices: Metrological calibration regulations: JJG693-2011 “Combustible Gas Detection and Alarm Devices”. The maximum calibration period for such devices is 1 year. ◆ Pressure transmitters: Metrological calibration regulations: JJG882-2015 “Pressure Transmitters”. These regulations apply to the calibration of positive pressure, negative pressure transmitters, differential pressure transmitters, and absolute pressure transmitters. The maximum calibration period for pressure transmitters is 1 year. ◆ Level gauges: Metrological calibration regulations: JJG971-2002 “Level Gauges”. These regulations are applicable to the calibration of buoyancy-type level gauges, pressure-type level gauges, capacitive level gauges, reflective level gauges, and radiation-based level gauges. The maximum calibration period for these types of level gauges is 1 year. Related reading on calibration periods: How to carry out periodic calibration of instruments; A detailed list of 3 types and 11 categories of pressure instruments that require mandatory calibration, along with their respective calibration periods