FAQ

Jiangsu Zhirui Technology Co., Ltd. is a comprehensive company integrating research and development, production, manufacturing, and system solutions. It specializes in the production of zirconia oxygen analyzers, passive nuclear level gauges, ultrasonic flowmeters, as well as instruments and equipment for temperature, pressure, flow, level, calibration, environmental monitoring, and intelligent IoT.

Top-level domestic research and development and manufacturing of instruments and meters.High-end customized industrial automation solutions.

The choice between rubber and PTFE lining should be based on the medium temperature. It is important to note that the maximum temperature resistance for rubber is 80°C, while PTFE can withstand up to 150°C and momentarily up to 180°C. Generally, for urban wastewater applications, rubber linings and stainless steel electrodes can be used. Next, the flange specifications for the body must be selected based on the medium pressure. Note that the flange specifications for electromagnetic flanges are typically rated at ≤1.6MPa for diameters ranging from DN10 to DN250, and ≤1.0MPa for diameters from DN250 to DN1000. If the actual medium pressure exceeds the corresponding range for the specified pipe diameter, a special order is required; however, the maximum pressure must not exceed 6.4MPa. When determining the conductivity of the medium, it is also crucial to ensure that the conductivity for the electromagnetic flowmeter does not fall below 5uS/cm. The conductivity of tap water is typically in the range of several to hundreds of uS/cm; generally, soft water (deionized water) conducts electricity, while pure water (highly distilled water) does not. Conductivities for gases, oils, and most organic liquid substances are far below 5uS/cm and thus do not conduct electricity. Additionally, it is necessary to understand whether the user prefers an integrated localized display or a separate remote display. It is also essential to inquire about any other additional functions needed. Please note that the electromagnetic flowmeter casing has two sealing protection ratings: IP65 and IP68. When selecting a submersible type with IP68, please consider the site conditions; if the electromagnetic flowmeter needs to connect to a computer, it is required to add an RS485 communication port or other protocol interfaces, which should be discussed in advance with the manufacturer’s technical personnel.

In modern industrial production, liquid level measurement is particularly important, which is directly related to the safety and efficiency of production. The selection of level gauges, as a key device for real-time monitoring of liquid or solid material levels, is particularly critical. At present, ultrasonic level gauge and radar level gauge are two technologies that have attracted much attention, and each has different characteristics and scope of application. Below, both techniques will be analyzed to help you better understand and choose.
Ultrasonic level gauges work on the principle of sound wave propagation, which determines the height of the liquid level by emitting an ultrasonic signal to the surface of the liquid and measuring its reflection time. This type of level gauge is widely used for level monitoring of liquids and solid materials, especially when the environmental conditions vary greatly. Compared to other level measurement technologies, ultrasonic level gauges are inexpensive and easy to install, however, their measurement accuracy is affected by the speed of sound wave propagation and the temperature of the medium, and they are sensitive to impurities and bubbles in the measurement environment.
In contrast, radar level gauges use microwave signals for level measurement, and their operating principle is based on the time lag between the signal reflecting off the surface of the material. Compared to ultrasonic level gauges, radar level gauges have an excellent microwave signal that is resistant to air bubbles, vapours or solid particles, thus ensuring their ability to provide high-precision measurement results. In addition, the radar level gauge has the characteristics of a wide measuring range and fast response. It is widely used in petroleum, chemical and pharmaceutical industries that require extremely high precision and complex and changeable environmental conditions. However, it is important to note that there are some potential limitations to radar level gauges. For example, in certain environments, measurement results may be affected by other electronic devices or electromagnetic interference. In addition, the price is relatively high compared to other conventional level measurement devices. However, with the continuous advancement of technology and the increasing maturity of the market, these problems are gradually being solved.
To sum up, the choice of level gauge needs to be determined according to the specific application requirements. Ultrasonic level gauges are suitable for general industrial needs due to their low cost and easy installation, while radar level gauges demonstrate high accuracy and strong immunity to interference in demanding environments. With a deep understanding of the characteristics of both technologies, companies can make informed choices that best fit their budget, precision needs, and work environment. …

The combined use of differential pressure transmitters and thermal resistance temperature transmitters needs to be selected and designed based on specific measurement requirements and application scenarios. During the usage process, it is necessary to pay attention to choosing the appropriate model and specification, correct installation and wiring, as well as regular calibration and maintenance. According to specific measurement requirements and application scenarios, select the appropriate model and specification of differential pressure transmitter and thermal resistance temperature transmitter. Ensure that they can meet the requirements in terms of measurement range, accuracy, response time, etc.
The methods and steps for combined use
1. Installation location selection: Differential pressure transmitters are typically installed in process pipelines or tanks to measure the pressure difference between media. The thermal resistance temperature transmitter is installed at the position where the temperature needs to be measured, and the two are connected to the corresponding transmitter unit through wires.
2. Signal transmission mode: Differential pressure transmitters typically adopt two-wire current output, such as 4-20mA, which has strong anti-interference capability and is suitable for long-distance transmission. The thermal resistance temperature transmitter also converts the temperature signal into a standard signal output of 4-20mA or 0-10V.
3. Wiring method: During the installation process, it is necessary to ensure that the axial direction of the pressure-sensitive component of the transmitter is perpendicular to the direction of gravity to minimize zero position changes. For thermal resistance temperature transmitters, choosing an appropriate wiring method (such as three-wire or four-wire) can reduce the influence of wire resistance on the measurement results.
In addition, in some high-precision measurement scenarios, it may be necessary to use differential pressure transmitters and thermal resistance temperature transmitters for mutual calibration. Due to the certain relationship between temperature and pressure, the measurement results of the differential pressure transmitter can be calibrated by measuring the temperature and referring to the corresponding pressure data, thereby improving the accuracy of the measurement. Similarly, the measurement results of the thermal resistance temperature transmitter can also be calibrated by measuring the pressure and referring to the corresponding temperature data.

With the continuous maturation and development of sensor technology, pressure transmitters have been widely applied in various industries. The pressure transmitter mainly consists of three parts: the pressure sensor, the measurement circuit and the process connection. It can convert the physical pressure parameters of gases, liquids, etc. sensed by the pressure sensor into standard electrical signals, which can be used by secondary instruments such as indicating alarm instruments, recorders and regulators for measurement, indication and process regulation. However, when in use, some matters still need to be noted to avoid measurement errors and shorten the service life of the pressure transmitter.
Ensure the stability and suitability of the power supply voltage to avoid measurement errors caused by excessively high or low voltage. Generally, the voltage used on pressure transmitters should not exceed 36V, as it may damage the sensor.
2. Do not touch the diaphragm with hard objects, as it may damage the diaphragm. The pressure transmitter is composed of a measuring diaphragm and electrodes on the insulating sheets on both sides, each forming a capacitor. When the pressures on both sides are inconsistent, it causes the measuring diaphragm to shift. The displacement amount is directly proportional to the pressure difference, so the capacitances on both sides are not equal. Through the oscillation and demodulation links, it is converted into a signal proportional to the pressure.
3. The measured medium must not freeze; otherwise, it will damage the isolation diaphragm of the sensor element, causing damage to the transmitter. If necessary, anti-freezing measures should be taken for the transmitter.
4. When measuring steam or other high-temperature media, a condenser such as a buffer tube (coil) should be connected. The temperature of the condenser should not exceed the limit temperature for the transmitter to be used. If it is higher than the limit temperature for the transmitter to be used, a heat dissipation device must be used.
When measuring steam or other high-temperature media, heat dissipation tubes should be used to connect the transmitter to the pipeline, and the pressure on the pipeline should be transmitted to the transformer. When the medium being measured is water vapor, an appropriate amount of water should be injected into the heat dissipation tube to prevent superheated steam from directly contacting the transmitter and causing damage to the sensor.
6. For installations located outdoors or in places prone to lightning strikes, lightning protection measures should be taken, such as setting up lightning protection devices beside the equipment and placing the power supply cables and signal lines of the pressure transmitter within the lightning protection conductors to ensure the safety and stability of the instrument.
7. During the pressure transmission process, several points should be noted: There should be no air leakage at the connection between the transmitter and the heat dissipation tube; When opening the valve, be careful to avoid direct impact and damage to the sensor diaphragm by the measured medium. The pipeline must be kept unobstructed to prevent the sediment in the pipeline from popping out and damaging the sensor diaphragm.

In today’s heating field, efficient and accurate heat measurement is crucial for achieving rational energy utilization and cost control. Ultrasonic heat meters play a significant role in heating systems with their outstanding performance and precise measurement.
The ultrasonic heat meter adopts the measurement principle of ultrasonic time difference method. By measuring the time difference between the co-current and counter-current propagation of ultrasonic waves in the fluid, and combining parameters such as the fluid flow velocity and the cross-sectional area of the pipe, the hot water flow rate passing through the heat meter can be accurately calculated. Meanwhile, based on the difference in water temperature between the inlet and outlet, the heat released or absorbed can be calculated. This measurement method is not affected by the physical properties and flow state of the fluid, and features high precision, high stability and high reliability.
The application of ultrasonic heat meters in heating mainly lies in the following aspects:
Monitor and optimize the operation status of the heating system: Ultrasonic heat meters can monitor in real time the water flow, temperature and heat output of the heating system, helping users understand the operation status of the system. If the heat output is insufficient, users can promptly identify the problem and take measures to ensure the normal operation of the system. In addition, by monitoring heat output and energy consumption, users can adjust the operation mode and temperature of the heating system, reduce energy consumption, and achieve the goal of energy conservation and emission reduction.
Improving heating efficiency: Ultrasonic heat meters can monitor the operation status and energy consumption of the heating system in real time, helping users promptly identify and solve problems. Based on the data from ultrasonic heat meters, heating companies can conduct load forecasting and system optimization, avoid oversupply or undersupply, and adjust heat distribution in real time to enhance the overall efficiency of the heating system.
Precise measurement and on-demand heating: In centralized heating systems, ultrasonic heat meters measure the time difference of ultrasonic waves traveling in the fluid in the co-current and counter-current directions, and combine parameters such as flow rate and pipe cross-sectional area to accurately calculate the hot water flow rate passing through the heat meter. Then, based on the difference in inlet and outlet water temperatures, the released or absorbed heat is calculated. This high-precision measurement method helps to realize the heat charging model, enhances users’ energy-saving awareness, and enables heating companies to rationally allocate energy and reduce operating costs.
Data remote transmission and intelligent management: All ultrasonic heat meters are equipped with data remote transmission functions, which can transmit measurement data in real time to the monitoring system, facilitating centralized management and monitoring of the entire heating system by heating companies, enabling them to promptly identify problems and take measures. Users can view real-time data through mobile devices or computers and obtain detailed calorie usage reports.
In conclusion, the application of ultrasonic heat meters in heating systems has a significant impact on heating efficiency, cost and environmental sustainability. With the continuous advancement of technology and the constant upgrading of heating systems, the application of ultrasonic heat meters will become increasingly widespread, making greater contributions to the development and progress of the heating industry.