Product Name: Master Meter Method Gas Flow Standard Device Model NO.: LLH model Transport Package: Standard Export Packaging Origin: China Product Description Product description:LLH-model master meter method gas flow standard device is a convenient, economical and practical standard instrument, using high-precision Roots meter or turbine meter as the master meters. It is designed according to the basic principles of master meter method devices and calibration regulations of related gas flowmeters. Adopting technologies such as the dual timing technology and the PID technology for stabilizing the flow, it has superior features like high level automation, quick efficiency, stable and reliable measurement structure, easy operation and space saving, etc. It is suitable for delivery and periodic calibrations on the displacement and velocity-type flowmetersProduct features:The overall structure of the device is simple, with a relatively small space requiredMaster meters adopt the parallel approach for convenient extension,showing strong interchangeabilityUse clean air as the calibration medium. Safe and energy-savingInstruments that could be calibrated include: Turbine flowmeter, rotary flowmeter, velocity-type flowmeter with low differential pressure and industrial gas meter, etcUse dual timing pulse acquisition module,demonstrating accurate and reliable timing and counting with high accuracyAdopt PLC as data acquisition and on-off control system, showing stable performance and strong anti-jamming capabilityCalibration system has a user-friendly interface and is easy to operate. It could dynamically display the field calibration results based on user needsPerformance index: Flow range of the device 0.5~20000m³/h (upper limit is optional to the user)Inspection platform: DN20~DN600 (upper limit is customized)Uncertainty of system: better than 0.3%Operating pressure of the device: Absolute pressure 20kPa~local barometric pressureOperating temperature of the device: 0ºC ~+40ºCWorking medium: clean air