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1. What are the reasons for the unstable flow rate of sterile water delivery?
The main reasons for the unstable flow rate of sterile water delivery are:
1. Equipment system problems - pump body seal wear (leakage>3ml/min needs to be replaced) - PID parameters of the frequency converter are not calibrated (response time needs to be adjusted according to GB 5226.1-2019) - there are ≥ 0.5mm cavitation points in the pipeline (which can be located through ultrasonic detection) Changes in fluid characteristics - Water temperature fluctuations exceeding ± 2 ℃ range (typically occurring during heat exchanger fouling) - Dissolved oxygen content>50ppb (can change fluid viscosity coefficient) - Filter pressure difference>0.15MPa (causing flow rate pulsation) 3 Control signal interference - flowmeter grounding resistance>4 Ω (to be detected with Fluke 287) - PLC analog module resolution<12 bit (recommended to replace with 16 bit module) - frequency converter carrier frequency<4kHz (should be adjusted to 8-10kHz) 4. Mechanical structural defect - check valve spring stiffness coefficient exceeding standard (detected according to JB/T 10364) - pipeline support spacing>1.5m (causing water hammer effect) - tank respirator blockage (pressure difference>30mbar needs to be replaced) Solution priority
1. First use a portable flowmeter (such as Siemens SITRANS F M) to detect the instantaneous flow fluctuation curve 2 Check the swing amplitude of the pressure gauge pointer at the pump outlet (normal should be ＜ ± 0.1bar). 3. Conduct a step response test on the control system (PID optimization is required for rise time>500ms). Dangerous operation warning: Do not disassemble the mechanical seal of the pump body without iso
2. Ranking of imported ultrasonic flow meters
The ranking of imported ultrasonic flow meters is as follows:
1. Since its establishment in 1962, OMEGA has a history of 59 years. OMEGA has evolved from manufacturing a single thermocouple product line to a global leader in the technology market, offering over 100000 state-of-the-art products for measuring and controlling temperature, humidity, pressure, strain, force, flow, level, pH, and conductivity.
2、 ProMinent, a German company, produces various precision metering pumps, measurement sensors, detection and control devices, ozone generation devices, chlorine dioxide generation devices, and ultraviolet disinfection devices. Its main business activities focus on precision metering, quantitative addition, and real-time control of various chemicals in industrial processes; Research and development, production, and engineering implementation of various complete sets of water treatment equipment.
3、 As the core of the Azbil Group, Azbil Corporation in Japan pursues "human centered automation" based on "measurement and control" technology, providing people with peace of mind, comfort, and satisfaction, and contributing to the protection of the Earths environment. The company is conducting building automation business in the building market; Carry out industrial automation business in factories and machinery equipment markets. Ultrasonic flow meter is an instrument that measures flow by detecting the effect of fluid flow on an ultrasonic beam (or ultrasonic pulse). Ultrasonic flow meters can be divided into propagation velocity difference method, b
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