Number of views: 5657 Author: Aili Industry Release time: 2027-04-12 Source: Ai Li Industrial
The total amount of TVOC alone is usually not sufficient to determine the chemical filter media. TVOC is comprehensive information under a specific detection caliber. It cannot account for all organic components, nor can it cover all acidic, alkaline or corrosive gases. Selection requires breaking the total amount back to specific components and sources, and then judging the media configuration.
The similar TVOC readings at the two workstations do not mean that the gases in the air are the same. One may be mainly alcohols or ketones, and the other may contain esters, aromatic hydrocarbons or siloxanes. The adsorption and reaction performance of different components on the medium are obviously different. The value reported by TVOC is affected by the detection method, calibration method and response factor. It answers 'approximately how much the comprehensive organic load is' rather than 'what gases are there and what are their respective concentrations'. Using the total amount to directly correspond to a certain type of filter material makes it easy to treat pollution from different sources as the same task.
TVOC is not a unified standard material, and the comparability of results obtained by different instruments and sampling methods is limited. Common on-site methods include PID photoionization, gas chromatography, and online monitoring. Each has inconsistent responses to low-concentration components, high-boiling-point components, and halogenated compounds. If the method, detection limit and sampling period are not indicated on the report, the reference value of this total data in selection will be reduced. When Aili Industrial accepts selection consultation, it usually confirms the testing caliber of TVOC first, and then uses the on-site material list to determine which components need to be separately tested, instead of directly recommending media based on the total amount.
In the absence of ingredient data, bills of materials and process operations are often more instructive than total quantity readings. For cleaning agents, adhesives, photoresists, developers, lubricants and packaging materials, the corresponding release component ranges are relatively easy to check. Sort out the safety data sheets, dosage, operating temperature and exhaust conditions of chemicals used in the workstation. You can first delineate possible acidic, alkaline, organic or silicone objects. For information on how to use cleaning agent information for preliminary screening, please refer toCan cleaning agent safety data sheets be used for chemical filter selection? . Only by doing this step solidly can subsequent supplementary tests be targeted.
The supplementary test is not to test TVOC again, but to take samples at key locations for suspected components. It is necessary to distinguish the fresh air inlet, supply air, return air and work stations, and clarify which points correspond to the actual protection objects. If the concern is about the device end or product surface, the detection point should be close to the location of use, rather than just measuring the room background. The sampling period should also cover different states such as production, cleaning and shutdown, and short-term peak and stable operating values should be recorded separately. Regarding the method of distinguishing whether the source of pollution is outdoor or internal, please refer toHow to distinguish whether workshop pollution comes from outside or inside?。
After getting the ingredient list, the selection enters the comparable stage. At this time, you need to confirm the target gas, concentration range, temperature, humidity and air volume one by one, and then check whether the medium has corresponding data. When mixing components, we should also consider whether there is competitive adsorption between the components and whether there is overlapping application range of the reactive media. Aili Industrial can provide media configuration options for FFU packages, box type, flat type and V-type products in chemical filter packages, and can assist in sorting out the target gas list according to project materials and working conditions. Products can be viewedChemical filter product series page to learn about media types, box MAU matching can be referred toMAU box-type chemical filter , FFU integrated configuration can be referred toChemical Filter FFU page. For existing systems that replace imported or other brands of filter elements, replacement checks can be made around the ingredient list and installation interface. The manufacturing and supporting system covers the independent research and development and production of motors and fans, control systems, sheet metal, air filters and complete machine assembly, making it easy to confirm the filter sections and air supply conditions together. The actual results are subject to on-site leak detection and gas detection results.
Does TVOC compliance mean that chemical filters can be dispensed with?
You can't judge like this. Compliance with TVOC standards only means that the comprehensive organic load under this caliber is within a certain range. Acidic, alkaline or specific sensitive components may not be included, and still need to be checked separately according to the protected objects.
When there is no ingredient data, can you first prepare a layer of activated carbon based on experience?
It can be evaluated as a temporary measure, but it is not recommended to be directly used as a final solution. Empirical configuration needs to be confirmed by exit testing during use and cannot replace ingredient investigation.
Can Aili Industrial help sort out the selection conditions from TVOC data?
It can be combined with the detection caliber, material list and on-site working conditions to help sort out the key components that need supplementary testing, and then check the media configuration accordingly. The specific plan needs to be confirmed based on the corresponding product information and site conditions.
Multiple workstations use different solvents, how to divide chemical filtration?
Do you need to know how many hours a day it will run when selecting a chemical filter?
Check items |
Confirm key points |
Check items |
Confirm key points |
|---|---|---|---|
Total caliber |
Check testing methods and units |
key ingredients |
Determine objects combined with materials |
Other gases |
Supplementary check of acid, alkali and special components |
Sampling point location |
Covering entrances and protected locations |
Period coverage |
Distinguish between production cleaning and shutdown |
Selection basis |
Corresponding to specific gas data |
In chemical filter projects, Aili Industrial usually does not just report one model, but first looks at the target gas, air volume and installation conditions together. When comprehensive data such as TVOC comes in, we will first ask about the testing method, sampling location and what chemicals were used on site, and then determine which components need additional testing and which ones can be configured according to the material range first. In terms of product form, FFU matching, box type, flat type and V type all have corresponding structures, which can be compared according to air volume and space conditions; if it involves replacing the imported filter element in the original system, the adaptation check can also be done according to the interface size and media requirements. The manufacturing end covers motors, fans, control systems, sheet metal and complete machine assembly. The interface problem between the filter section and the air supply power can be solved in the same package. The specific gas effect, applicable environment and replacement cycle still need to be verified based on the corresponding configuration data and on-site working conditions. learnChemical filter product series , check the products and air supply matching according to the project conditions. The actual results are subject to on-site leak detection and gas detection results.
