DRK139 leak tester

Product details

Product description

The leak rate tester produced by Shandong Drick Instrument Co., Ltd. is independently absorbed on the basis of reference to similar foreign equipment, and further improved, based on GB2626-2019 "Respiratory protection self-priming filter anti-particulate respirator" 6.4 Leakage rate, redesigned and produced the device for filtering efficiency and smoke filtering performance of filter material and filter element performance. It adopts corn oil and gas sol generator and photometer acquisition system. It adds a computer control system and improves the level of automation. It is a test device with complete functions, advanced technology and high level of automation in the same type of products at home and abroad.

Main technical requirements

The main components of the equipment

The leak rate test stａnd is domestically produced, but the core components include an aerosol generator and the photometer is imported from abroad. The air source required for the entire air path is external compressed air, and the power for detecting the air path is provided by the vacuum pump. Set an aerosol generator and a generating pipeline on the generating gas path; set a pneumatic clamp with a cylinder, a laser dust particle counter on the detection air path, an upstream and downstream test channel, a rotameter, and a vacuum pump; One sealed cabin.

According to the standard

GB2626-2019 "Respiratory Protection Self-priming Filter Anti-Particle Respirator"

technical parameter

1. Aerosol type: corn oil, NaCl

2. Aerosol dynamic particle size range: (oily) (0.02-2) um, mass median diameter 0.3um.

(Salinity) (0.02-2) um, mass median diameter 0.6um.

3. Photometer: concentration range 1ug/m3-200mg/m3, ±1%

4. Sampling flow range: (1~2) L/min 7. Power supply: 230 VAC, 50Hz, <1.5kW

5. Appearance size: 2000mm×1500mm×2200mm

5. Inlet temperature of test room: (25±5)℃;

6. Temperature and humidity of the air intake environment of the laboratory: (30±10)%RH;

7. Electricity: Chinese system, power supply voltage AC220V±10%, power suppl

The main components of the equipment

Three-stage filter

The first level is the Q level, which can remove a large amount of liquid and solid particles above 3μm, reaching a minimum residual oil content of only 5ppm, with a small amount of moisture, dust and oil mist;

The second level is the P level, which can filter out liquid and solid particles as small as 1μm, reaching a minimum residual oil content of only 0.5ppm, with trace moisture, dust and oil mist;

The third level is the S level, which can filter out liquid and solid particles as small as 0.01μm, reaching a minimum residual oil content of only 0.001ppm, and almost all moisture, dust and oil are removed;

Aerosol generator

The main technical parameters are as follows:

Particle size range: 0.01～2m

Average particle size: 0.3m

Dynamic range: >107 pieces/cm3

Geometric standard deviation: less than 2.0

The atomizing aerosol generator has a large flow rate and a built-in dilution system. The user can choose the number of enabled nozzles, each nozzle can generate more than 107 particles/cm3 at a flow rate of 6.5 lpm (pressure 25psig). The built-in dilution system is controlled by valves and rotameters, and the output particle concentration is adjustable. Polydisperse high concentration aerosol. The polydisperse aerosol can be generated by atomizing the solution, and the monodisperse aerosol can also be generated by atomizing the suspended monodisperse particles. A variety of materials can be used (PSL, DOP, silicone oil, salt, sugar, etc.). This equipment The main occurrence is corn oil and gas sol.

The compressed air from the outside is divided into two channels after constant pressure filtration, one way into the aerosol generator, which emits a mixed gas containing particles, and another way of compressed air into the cylinder to make the upper and lower fixtures close to clamp the sample.

Vacuum pump for power

According to the curve:

26 inHg max.vacuum

8.0 CFM open flow

10 psi max.pressure

4.5 CFM open flow

0.18kW

 HEPA high efficiency filter

High-efficiency filter, the filter with a transmission rate ≤0.1% (ie efficiency ≥99.9%) or a count transmission rate for particles with a particle size ≥0.1 μm ≤0.001% (ie efficiency ≥99.999%) is a high-efficiency air filter

 Photometer

Photometer parameters:

Number of probes: 2

Detection concentration range: 1.0 μg/m3～200 mg/m3

Range selection: automatic

Sample gas flow: 2.0 L/min

Purge gas flow: about 20 L/min

Appearance size: 15cm X 25cm X 33cm

The aerosol photometer is specially designed for mask quality certification and filter material testing. It uses a reliable and durable diode laser to provide a stable laser light source that can be used for a long time without attenuation. The unique sheath gas protection system can keep the detection light room clean and low background noise, so the product requires little maintenance. The reliability of the design and use of this product has been verified by the US government laboratory for more than 10 years. It is especially suitable for laboratory testing of mask filtration efficiency and filter material filtration efficiency. The control commａnd of this product is very simple. It can easily meet the requirements of test procedures and data management using LabVIEW software. Therefore, it is very convenient for users to design and build masks and filter material filtering efficiency. The soft probe of the test table can be adjusted in 360 degrees. Power supply : Power adapter DC 24V, 5A, output: RS232 port connection (can be converted to 485) or external printer (optional) can store 1000 sets of data.

Control volume board

With DIO, counter function, AD cache: 8K FIFO, resolution 16bit, analog input voltage 10V, voltage range accuracy 2.2mV, voltage range accuracy 69uV. It is used to collect the feedback value of acceleration sensor and angle sensor in real time. This card has its own cache function, which avoids data distortion caused by industrial PCI card and PLC system due to long analysis time.

4.7 Industrial Computer

4U double door industrial chassis

4U, 19 inches can be racked, all steel structure, in line with FCC, CE standards

Provides one 3.5" driver and three 5.25" driver bits

Optional industrial full-length CPU card or ATX architecture motherboard

Double doors on the front panel with lock to prevent misoperation, 2 USB ports on the front, power switch and reset button

The front panel provides power and hard disk indicator lights with a special curved beam design, the height of the curved bead is adjustable

product description

4U, 19-inch rack-mountable, all-steel structure; one 3.5" and three 5.25" drive positions; one 12025 double-ball high-speed cooling fan at the front; Power ON/OFF, Reset

Material: 1.2mm high-quality carbon high-strength structural steel, in line with FCC and CE standards

Configuration:

Control part and post-processing

control function

l Manually fill in the test content, automatically open and adjust the flow to reach the target flow range, and collect the real-time value of the required sensor;

lAccording to the filled flow, automatically switch the pipeline to make it reach and stabilize in the required flow test range to ensure the set air flow and its accuracy.

lAdjust the aerosol concentration as required before the test, and it can start and stop automatically at the beginning and end of the test

l Press the "Stop" button at any time during the test to stop the test.

Data detection and processing functions

lEnter the corresponding parameters through the keyboard before the test, the device automatically collects environmental parameters (automatic collection of environmental parameters needs to be separately proposed by the user), such as atmospheric pressure, pipeline temperature and humidity, etc.; during the test, enter the air flow rate, powder feed and other tests through the keyboard Parameters and display them on the display

 The relevant data in the test are displayed on the test interface of the industrial computer screen. According to the test requirements, several test points in each test are automatically performed in sequence, and the test will be automatically stopped after the test is completed. After the test data is processed by the computer, it can be stored or output through the printer, and realize the filter efficiency of the filter material and the filter performance of the filter component.

l The previous test data should be able to be searched and queried;

lThe measurement interface is friendly, with man-machine dialogue function;

lThe test device has advanced technology, high degree of automation, and good accuracy and repeatability of test results. Therefore, it has great advantages for users' use, installation and maintenance. It is an indispensable test equipment for air filter design and production units to develop new products for research, testing and verification. It is also an indispensable equipment for comprehensive inspection of air filter manufacturers' products and entry inspection of air filters for engine manufacturers. Applicable to the inspection and verification department for testing and product evaluation of air filter performance.

Control Strategy

For the system, the controller is the control core and network hub of the entire system, which is crucial to its choice. At present, the control scheme based on the integrated board of single PC and the independent control scheme based on PLC occupy the dominant position in system development, but they have their own shortcomings and are difficult to replace each other. A

Control scheme of integrated board based on single PC

In this control application scheme, the software platform of the system can use windowsNT, windows CE or Linux, etc., the general IO board and IO terminal board (or field bus card, field bus and remote I/O module) are responsible for industrial control Deal with the scene. The collected input signal is received and analyzed by the PC, and then processed by the soft PLC operating system. The control application program written by the soft PLC development system (programmer) is also interpreted and executed by the soft PLC operating system, and finally the processed signal is output to Local (or remote) control site completes the corresponding local control (or remote control) function, and its control scheme and process.

The control system structure of the industrial computer combined with the I/0 board is shown above. It is mainly composed of industrial control computers, digital input and output boards, analog input and output boards, buttons, switches, precision adjustable positioners and other control equipment, numerical sampling sensors, and indicator lights. According to the actual needs of the site, the connection between the controlled device and the control system is performed. In addition. Corresponding boards can be inserted in the expansion slot to expａnd the control functions of the system. A

PC-based control refers to the use of PC software and hardware to achieve PLC control functions, and fully reflects the flexibility and high cost performance of PCs in communication, storage, and programming. However, compared with PLC, its shortcomings are also obvious: poor stability, deterministic control cannot be achieved, and it is easy to crash restart; poor reliability, the use of non-industry standard hardening components and rotating disks are prone to failure; the development platform is not uniform, although PC control can Complete many high-end control applications, but often require different development environments. At the same time, the price of PCI boards is relatively high. A

PC-based control refers to the use of PC software and hardware to realize the control function of PLC, and fully reflects the flexibility and high cost performance of PC in communication, storage, and programming. However, compared with PLC, its shortcomings are also obvious: poor stability, deterministic control cannot be achieved, and it is easy to crash restart; poor reliability, the use of non-industry standard hardening components and rotating disks are prone to failure, and the development platform is not uniform, although PC control can Complete many high-end control applications, but often require different development environments. A

This control system collects parameters such as flow, temperature, humidity, etc. in the system in real time, processes the collected parameters using industrial computers and boards, and executes software control procedures to complete the system control of on-off valves, regulating valves, vacuum pumps, etc. Experimental procedure. Finally, print and output the test data report through the printer. At the same time, the computer control system can also monitor the test status in real time, and display and output the on-site abnormal conditions.

Test data section

This part is composed of air flow, temperature and humidity, upstream and downstream concentrations, etc.

Electrical safety and protection system

lThe ground wire must be well grounded, and the grounding resistance is less than 4 ohms;

lThe motor starting cabinet has protections such as phase loss, undervoltage, overload, short circuit, overheating, etc., and corresponding signal output;

lThe sensor signal line is connected with shielded wire, and it can be grounded at one end according to the situation, to prevent interference signals and affect the measurement. In addition, the system determines whether the sensor is working properly through the electrical zero point method;

lWeak point control and strong current method are used for logic control, and relay isolation is used;

lAll the measuring pipelines are equipped with micro differential pressure switches before and after the absolute filtration, which is used to judge whether the absolute filter paper is invalid and make an alarm output;

l The gas circuit of the entire system is equipped with a low-pressure protection switch. When a low-pressure protection signal is detected, the system will prompt to prevent the pneumatic valve from opening due to the low pressure of the air source, resulting in system failure;

External interface

Use standard Modbus protocol

Modbus protocol is a universal language applied to electronic controllers. Through this protocol, the controllers can communicate with each other, and the controller can communicate with other devices via a network (such as Ethernet). It has become a universal industry standard. With it, control equipment produced by different manufacturers can be connected into an industrial network for centralized monitoring. This protocol defines a message structure that a controller can recognize and use regardless of the network through which they communicate. It describes the process of a controller requesting access to other devices, how to respond to requests from other devices, and how to detect and record errors. It establishes the format of the message domain and the common format of the content.

When communicating on a Modbus network, this protocol determines that each controller needs to know their device address, recognize the messages sent by the address, and decide what action to take. If a response is required, the controller will generate feedback information and send it using Modbus protocol. On other networks, messages containing Modbus protocol are converted into frames or packet structures used on this network. This conversion also extends the method of solving section addresses, routing paths, and error detection according to specific networks.

This protocol supports traditional RS-232, RS-422, RS-485 and Ethernet devices. Many industrial equipment, including PLC, DCS, smart instruments, etc. are using Modbus protocol as their communication standard.

Equipment matching requirements and required to complete the test

Equipment supporting

Compressed air source

Compressed air pressure is 0.5 ~ 0.7MPa, flow rate is greater than 0.15m3/min, and compressed air is required to be dry and clean

Power matching

220VAC, 50Hz; stable power supply above 1.5kW, leading to the high power control cabinet with radius less than or equal to 2M near the equipment