Has anyone used a dust alarm?

We have a dust alarm for our powder transfer pipelines! ! ! I really don’t know what the principle is! ! !

I searched the Internet for information on dust alarms: Online dust detectors use the transmission principle to measure dust concentration; by testing the curve of light attenuation caused by dust, and through processing via a control program, the measured dust concentration is displayed clearly. The detectors are also calibrated using the scattering principle. 1. Suitable for health and quarantine inspections, as well as in industrial facilities where there is a high level of dust, such as power plants, coal silos, grain stores, and cement factories. It can also be used for safety inspections in coal powder production workshops and for environmental monitoring in flour processing plants.
2. Dust control monitoring by labor departments in industrial and mining enterprises; applications in workshops, glass fiber production, bag filters, cartridge filters, and electrostatic dust removal systems.
3. Environmental protection testing and identification of pollution sources. It is useful for environmental agencies to monitor dust control measures in enterprises, as well as for environmental inspections related to cement production and municipal smoke monitoring.
4. Rapid testing for scientific research, including tests on the performance of filter materials.
5. Measurement of dust concentration on-site and monitoring of dust levels at exhaust outlets.
6. Research on temporary online dust removal/pelletization processes.
7. Detection of total dust, respirable dust, and coal dust in underground coal mining areas.
8. Occupational health and safety assessments.
9. Use in factories where clean air is necessary, as well as in the management of manufacturing processes for precision instruments, testing equipment, electronic components, food, pharmaceuticals, etc.
10. Used by various research institutions in fields such as meteorology, public health, industrial occupational health engineering, and atmospheric pollution research. Its applications are quite diverse

Thank you! Article 6 is where it needs to be applied at present.

There are mainly two purposes for using dust meters in workshops: one is to meet the occupational health needs of workers. **According to the standards set by the Ministry of Health, a dust concentration of over 10 mg/m3 poses a threat to human health, as it can lead to conditions such as pneumoconiosis and tuberculosis. 2 is dust explosion prevention. The dust concentration in the workshop is too high, posing a risk of explosion. At present, many companies in China are not yet aware of this; most of them are reluctant to install such devices as it offers no benefits to their business. Yet these dust detectors are indeed necessary, **and the safety supervision authorities are becoming increasingly strict regarding this issue. Depending on the circumstances, it’s best to install an online dust monitoring system if possible; otherwise, opt for a portable one if you don’t want to spend extra money.

It depends on your choice. The sampling type offers good precision and reliable measurement results, but sampling is required and regular maintenance is necessary. The electrostatic type requires less maintenance, but it has higher demands regarding the measurement environment, and its measurement results are not entirely reliable.

There are definitely dust alarms available; it is recommended to look for them on Alibaba, as they offer a good cost-performance ratio

This post was last edited by nzg_801 on 2016-1-21 at 18:49. The original poster said that the term \"dust alarm\" should be understood from the perspective of requirements; from the standpoint of dust measurement devices, they are categorized as dust switches, dust transmitters, and dust analyzers – all of these refer to devices that operate online. There are also many sampling devices available. However, according to national and ISO standards, if sampling cannot be done at a constant rate, then it’s all pointless; the data collected is worthless, and the values obtained will be much lower than the actual dust levels, which is nothing but self-deception. Sampling must be carried out by professionals; it’s not something that ordinary people can do. For example, when the environmental protection agency takes samples from pipes, it always uses the isokinetic sampling method (also known as the weighing method). Online dust switches are the cheapest and also the worst in quality. The reason is simple: dust switches provide digital output, so precision isn’t an issue. Manufacturers of dust switches, whether in China or abroad, produce products with errors ranging from 100% to 1000%; after all, it’s a digital output, and users aren’t able to verify its accuracy. For example, if an alarm is set at 50mg/m3 on the dust collector, but it only triggers an alarm when the level reaches 500mg/m3, the user is unaware of this. By the time they check the dust collector due to the alarm, leakage has indeed occurred; yet in reality, the user has suffered significant losses. It’s possible that several months have already passed since the leakage level rose from 50mg/m3 to 500mg/m3. Fortunately, it’s the users. Generally, users who want to save money and settle for a basic option choose this one. A dust transmitter is a bit more advanced than a dust switch; both are generally integrated units. It generally features an analog 4-20mA output, available in two-wire and four-wire configurations; there are both domestic and imported versions, with imports coming from the United States, Germany, Finland, and Australia. Two-wire 24V 4-20mA dust transmitters are the most common. The concept of precision can be discussed; at least customers have a way to verify it, so they aren’t deceived too badly by sellers. However, the quality of dust transmitters varies as well – just because something is imported doesn’t mean it’s of good quality, and even among imported products, there are differences in quality and price. The best option is a dust analyzer; it is expensive but offers the highest precision, and it is used in situations where users have strict requirements regarding dust. For example, users don’t want to deceive themselves, especially when it comes to protecting important equipment; if the equipment is damaged by dust and stops working, the company suffers losses, the owner loses money and gets angry, and those responsible must take action. Most of these are modular, consisting of a control host, a sensor probe, and a communication cable. Similarly, there are both imported and domestic options; however, for split-type dust analyzers, only a few 2-3 are imported from the United States and 1-2 are domestic.

Are there any relevant standards or documents supporting the use of dust alarms?

We use the DUMO model from SINTROL for granulation; it’s of good quality, but it is a bit expensive.