52results about How to "Low measurement limit" patented technology

The invention discloses a large-caliber magnetoelectric vortex shedding flowmeter which comprises a large-caliber sounding pipe and a small-caliber magnetoelectric vortex shedding flowmeter and is characterized in that the small-caliber magnetoelectric vortex shedding flowmeter is inserted into the large-caliber sounding pipe. The caliber of the large-caliber magnetoelectric vortex shedding flowmeter of the invention can achieve DN600 at most, even larger. Under the situation of the same caliber and flow speed, compared with the original magnetoelectric vortex shedding flowmeter, the flowmeter of the invention can release with high frequency and strong signals, that is, the novel flowmeter has the advantages of high measuring accuracy, low measurement lower limit, and short straight pipe sections installed at the front and the back; under the premise of guaranteeing the sounding pipes with the same specification are interchangeable (guaranteeing that the sounding pipe used for detection and the sounding pipe of a user are consistent), and under the situation of keeping the direction of installing the small-caliber sensor to be consistent, the core part of the small-caliber sensor is returned to the OEM or the monitoring and managing department, thus solving the problem of the difficult sending for detection of the large-caliber magnetoelectric vortex shedding flowmeter and greatly reducing the assembly and disassembly cost of the sending for detection.

This disclosure proposes a laser particle size analyzer and a measurement method for realizing all-round measurement. The laser particle size analyzer includes a rotating laser transmitter receiver and a sample pool. The circle, the rotating laser transmitting receiver includes a rotating device and a measuring device arranged on the rotating device, the measuring device is used to emit a laser signal to the sample cell and detect an echo signal. The disclosed laser particle size analyzer and its measurement method can realize continuous and seamless reception of scattered light from 0° to 180°, and further expand the measurement lower limit of the laser particle size analyzer. The measured results are in good agreement with the nominal values, and the lower limit of measurement is close to the theoretical limit of the static light scattering method. And by using the rotating laser transmitter receiver for multi-angle measurement, and then measure the size of irregular particles at different angles.

The invention discloses a method for detecting antioxidant content in transformer oil by square wave voltammetry. The method is to ultrasonically dissolve a certain amount of transformer oil in a certain volume of supporting electrolyte, and use a graphite electrode with a diameter of 6 mm as a working electrode. The square wave voltammetric method was used to measure the content of T501 antioxidant in transformer oil by electrochemical workstation. On the basis that the peak current of the characteristic peak of T501 antioxidant was proportional to its concentration in transformer oil, the method of using square wave was established. Voltammetric method for detecting the content of T501 antioxidant in transformer oil. Compared with the prior art, the invention has simple operation, low cost, rapid measurement and high accuracy, and can realize on-site analysis of samples.