1. Should the ultrasonic flowmeter in the fire pump room be wired? The handheld ultrasonic flowmeter used in the fire pump room does not require wiring. It adopts an external clamp installation, with the probe directly attached to the outer wall of the pipeline, powered by batteries, and can measure flow by inputting parameters such as pipe diameter and material when turned on. The entire process does not require pipe breakage, continuous water supply, or power cord connection. Fixed ultrasonic flow meters (such as pipe section or flange type) require wiring, including power lines, 4-20mA signal lines, or RS485 communication lines, for long-term online monitoring and data remote transmission. However, these devices are mostly used for new construction or renovation projects and are not for inspection scenarios. According to the spot parameters of Shanghai Fire Ultrasonic Flow Meter (DN50-DN500, Mingyu brand), portable models are commonly used for on-site testing, emphasizing "instant clamping and testing, instant testing and travel". The 15 hour battery life supports full day inspection, completely avoiding the difficulties of wiring construction.

2. What are the well-known brands of steam flow meters?

Currently, well-known brands of steam flow meters are divided into two camps: domestic and international, covering different application scenarios of high, medium, and low-end. Suitable products can be selected according to working condition accuracy, temperature and pressure resistance requirements, and budget.

1. Domestic Brands 1 Chongqing Qingtian Teke: Southwest flow meter leader, high-end substitute benchmark for domestic steam flow meters. The core products include vortex street, orifice plate, V-cone, ultrasonic flowmeter, etc., with an accuracy of ± 0.5% FS, temperature resistance of -40 ℃ to 350 ℃, and a maximum pressure resistance of 40MPa. Equipped with integrated temperature and pressure compensation to enhance anti vibration design, built-in intelligent signal processing chip, widely used in industries such as thermoelectric and chemical. Chongqing Chuanyi CYY: a leading and listed company in domestic automation instruments, participated in the formulation of national standards for steam flow meters. The core products are CVM series vortex flowmeter and differential pressure flowmeter, with a temperature resistance of 550 ℃ and a pressure resistance of 35MPa. 3. Xingao Technology: a representative of high cost-effectiveness of domestic steam flow meters, with full industry chain supporting and system integration capabilities, and dense after-sales network. The core product VFM series vortex flowmeter has an accuracy of ± 1.0% for saturated steam and ± 1.5% for superheated steam. It uses dual piezoelectric differential sensors and has strong anti vibration interference ability, solving the problem of small flow "wave loss". It is applied in multiple trade settlement scenarios.

4. Huizhong Instrument: Deeply cultivating ultrasonic flow measurement technology, it is a benchmark brand for anti-interference and corrosion resistance in China. The core products are titanium alloy vortex flow meters and thermal gas mass flow meters. The titanium alloy generator is resistant to salt spray corrosion, has self diagnostic function, wide range ratio, and good repeatability. Weifang Aobo Instrument is a highly influential professional manufacturer of steam flow meters in the northern region. Our main p

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