Overview

Intelligent intubation flowmeter is a new type of intelligent flowmeter developed and designed on the basis of Tsinghua University and Tianjin University technology. Its predecessor is the explosion-proof intubation (probe) type flow meter of our company.

Tieling Tie Guang Instrument Co., Ltd. has cooperated with Tsinghua University and Tianjin University to jointly develop and design intelligent intubation flowmeter, namely explosion-proof intubation (probe) type flow meter. After more than ten years of application in a wide range of industrial fields, it has continuously summarized and improved the measurement theory and mature experience of intelligent intubation flowmeter. The intelligent intubation flowmeter is superior to other flowmeters in many aspects.

Working principle

Intelligent intubation flowmeter is a point flow rate type differential pressure flowmeter designed according to the international standard ISO3966 "measurement of fluid flow in closed pipes-velocity area method using pitot static tube.

The flow rate is measured by a sensor measuring the difference between the total pressure and the static pressure of the fluid in the center of the pipe. Insert the sensor into the center of the pipeline. The head-on pressure measuring hole measures the total pressure, which is connected with the total pressure pipe to lead out the total pressure signal. The back pressure measuring hole measures the static pressure, which is connected with the static pressure pipe to lead out the static pressure signal. The two pressure signals are respectively connected with the "-" end of the differential pressure transmitter to output the differential pressure signal. At the same time, the thermal resistance thermometer measures the fluid temperature, together with the pressure signal, differential pressure signal and flow coefficient, it is input into the intelligent totalizator or DCS system for calculation, and then the relevant data is displayed.

Features

1. It has the characteristics of anti-blocking: the sensor of the intelligent intubation flowmeter adopts two forms: bullet type (measuring cleaner medium) and S-shaped backrest tube (measuring medium with impurities). The bullet form is designed according to the bullet-shaped end face detection rod introduced by the American Willis Company. Because there are two fixed and gentle inflection points, the stability of the flow coefficient is better. The high-pressure measuring hole of the warhead-shaped end face forms a static high-pressure area due to the wider front of the warhead, which will prevent solid dust particles in the fluid from entering, and its anti-blocking performance is better than that of other cross-section detection rods. The S-shaped backrest tube forms a high-pressure area in front of the probe, and irregular swirling flow is formed in the high-pressure area. The dust falls naturally under its own gravity, preventing particles from entering. These two forms solve the problem of sensor clogging in principle.

2. High temperature and high pressure resistance: As the sensor material is generally made of 0Cr18Ni9 stainless steel (other materials can also be selected according to different fluids), it can withstand high temperature of 650 ℃ and withstand pressure of 32MPa.

3. High reliability: Due to the reasonable and simple structure design of the sensor, the medium in the pressure guide tube does not flow, and impurities are not easy to enter, so the measurement accuracy can be maintained for a long time.

4. Convenient installation: only need to open an appropriate hole at the appropriate position of the pipeline (70% of the inflow direction of the straight pipe section) and insert the head of the sensor into the center of the pipeline. For some working conditions, online installation with pressure can be realized.

5. Simple maintenance: The sensor itself does not need maintenance. It only needs to check the zero point and full scale of the differential pressure transmitter according to the requirements of regular verification of measuring instruments, and input the corresponding current to the secondary meter for inspection. It can also realize online dredging and online cleaning.

6. Wide measuring range: it can measure all kinds of gas, steam and liquid in full pipe; it can solve the problems that are difficult to measure such as ultra-small pipe diameter and ultra-large pipe diameter, low flow rate and small flow rate; it can realize the measurement of various shapes of pipes such as round, square, rectangle, rhombus, trapezoid, ellipse, triangle and so on.

7. Energy saving: Due to the simple structure of the sensor, its cross-sectional area is very small, there is almost no pressure loss in the fluid pipeline, and the operating cost is greatly reduced. Compared with the orifice flowmeter, it has obvious energy-saving effect. After calculation, the intelligent intubation tube The energy consumption ratio of the flowmeter to the orifice flowmeter is about 1.2:100.

8. Requirements for straight pipe section: ≥ 2D after bending. If this condition is not met, the intelligent intubation pipe can be marked on site according to the length of the on-site pipe section to ensure the accuracy of the measurement.

9, to achieve the factory before the intelligent intubation tube flow meter one by one calibration.

10. The intelligent intubation flowmeter has high accuracy, good repeatability and stability.

PTB type intelligent flow totalometer

PTB type flow totalometer is an intelligent programmable instrument. The instrument can accept the flow sensor signal with pulse signal output or analog current signal output, and is equipped with a pressure transmitter and a temperature transmitter to form a high-precision flow measurement system. With the support of the instrument software, the online temperature and pressure compensation operation can be carried out on the measured medium to improve the measurement accuracy. The instrument provides more than 20 working modes, which can display the accumulated mass flow, standard condition volume flow or working condition volume flow, as well as the temperature, pressure, instantaneous flow, density, frequency and other parameters of the measured medium. The instrument is programmed to set parameters and cumulative flow values without loss for a long time. The instrument has anti-theft function, and automatically records and displays the number of parameter modifications, cumulative power failure time or power failure times in use.

PTB type flow totalometer advantages:

1, can cooperate with the radio to form a wireless network, realize wireless telemetry, timely access to different geographical distribution of different measurement points of instantaneous flow, cumulative flow, temperature, pressure, power-down time and other parameters; can also cooperate with the modem, the company is responsible for the construction of the entire system.

2, the use of external input parameters of the original way, can be charged plug, friendly man-machine interface, easy to operate.

3. It has two display modes of digital and analog, which can meet the needs of users.

4. In order to improve the reliability of digital communication, the dual CPU structure is adopted, the original data buffer technology is adopted between the two CPUs, and the communication task is managed by a dedicated CPU.

Technical performance of PTB type flow totalometer

1. Power supply: 220VAC,50Hz;

2. Opening size of upper plate:

Width × height = 152 × 76;

3. Working environment: temperature -30~50 ℃, relative humidity ≤ 90%;

4. Signal input:

Flow signal: power supply 24VDC or 12VDC, pulse signal 1-5000Hz input, or power supply 24VDC,4-20mA input;

Pressure signal: supply power 24VDC,

4-20mA input;