Industry background

Dust refers to solid particles suspended in the air. Traditionally, there are many names for dust, such as dust, ash, smoke, mineral dust, sand dust, powder, etc. These terms have no clear boundaries. The International Organization for Standardization stipulates that the particle size is less than75MmThe solid suspended solids are defined as dust. Nowadays, many industrial workshops produce dust particles that float in the work area. Moreover, the particle size of the dust is very small, and some particles can float for a long time and be inhaled into the lung cavity of the human body. Over time, it can cause lung disease and tumors, which is extremely harmful to the human body. Another hazard is explosion hazard,21Since the turn of the century, with the rapid development of industry, dust explosion accidents have become increasingly common, and the types of explosion dust have also increasedMixing with air can form a combustible gas mixture. If encountering open flames or high-temperature objects,Extremely prone to ignition, completing the combustion process in an instant, releasing a large amount of heat energy, causing the combustion gas to suddenly rise and expand violently, forming a high expansion pressureIt is commonly known as a dust explosion.

The following are types of dust that can easily cause explosions:

The solution is as follows:

Monitoring location: feed polishing workshop, near the polishing machine, unloading area, machine room, control room and other environments containing dust

Monitoring medium: feed dust particles

Detection instrument: Online dust concentration detector (24-hour continuous real-time concentration detection)
Data transmission: Determine how many sets of dust detection alarms to install in each monitoring area based on the on-site situation. All detectors have real-time data display and sound and light alarm functions, and can transmit real-time data and alarm information through4-20mATransmit signals through RS485 bus or wireless 4G network to the dust alarm controller in each nearby area, and then pass throughRS485 bus based digital signals, GPRS wireless transmission or other forms are transmitted to the hub control box in the central control room, and then transmitted to PLC or DCSThe monitoring system also supports uploading data to the environmental protection bureau, allowing real-time viewing of on-site monitoring data. Multiple safety monitoring methods ensure production and personal safety.

Product description of dust detector:

HANG1000-PM-T dust concentration detector is suitable for real-time and accurate detection of dust concentration in factory workshops, using imported laser sensors and microcontroller technology The advantages include fast response speed, high measurement accuracy, good stability and repeatability The explosion-proof wiring method is suitable for various hazardous areas and compatible with various control systems such as control alarms, PLCs, DCS, etc.

Detector signal output:

① 4-20mA signal: standard 16 bit precision 4-20mA output chip, transmission distance of 1km
② RS485 signal: using standard MODBUS RTU protocol, transmission distance of 2Km
③ Voltage signal: 0-5V, 0-10V output, customizable
④ Pulse signal: also known as frequency signal, with adjustable frequency range (optional)
⑤ Switching signal: Standard configuration includes 2 sets of relays, optional third set of relays, passive contacts for relays, capacity 220VAC 3A/24VDC 3A

The dust concentration alarm value is set as follows:

The particle size of dust in the feed workshop is usually not very large, so the conventional range of 0-6000ug/m3 (micrograms per cubic meter) is sufficient. The default alarm value of the dust detector at the factory is a first level alarm (low alarm) of 1000ug/m3 (micrograms per cubic meter) and a second level alarm (high alarm) of 3000ug/m3 (micrograms per cubic meter). However, the actual alarm value can be adjusted according to the actual situation of the user's site, because the dust concentration in each different workshop is different. Some sites may have a maximum concentration of only a few hundred micrograms, which is not as high as that. The dust detector is mainly used for early warning and prevention to prevent excessive concentration and violent explosions on site.

Precautions for installation of dust detector:

The specific installation location of the alarmas follows：

1. Dust detection alarm should be installed at a distanceground1.5 MichaelAnd the sensor part is facing downwardsThis facilitates better detection of dust concentration.

2The installation position of the dust detection alarm is based onAccording to the relevant provisions of GB50493-2009 "Design Specification for Detection and Alarm of Flammable and Harmful Dust in Petrochemical Industry", the installation position of dust detection alarm is determined based on the detection of dust density and wind direction.

Usually, dust detectors are installed in a wall mounted manner, commonly known as wall mounted installation or natural diffusion type, mainly used in workshops,warehouse,University laboratory,Outdoor various places, etc;First, drill a hole on the wall with a diameter of8Millimeters, thenFix the dust alarm detector in place with screws and nuts, (The place where the detected dust is most likely to be generated);Get electricity nearby24Vorone whoPLC,The control and monitoring system is powered directly for operation;Generally installed above the ground1.5 meters Located or installed near the rowdustJust at the mouth.

Honieger Technology focuses on gas and dust detection, and uses constantly innovative technology to safeguard the safety production of enterprises! For more information on gas industry testing, please call our technical manager, Mr. Tian, at 15361572513 (VX same number)