The core of cleaning frequency for connecting pipelines is "adjusting as needed", and the core judgment criteria are pipeline pollution risk, usage environment, medium characteristics, and detection data feedback. The ultimate goal is to avoid pipeline blockage, sensor contamination, or affecting detection accuracy. The following are specific quantifiable adjustment factors that balance practicality and operability, making it easy to implement in practical scenarios:
1、 Core adjustment factors (sorted by priority)
1. Environmental dust/particulate matter concentration (the most critical factor)
High risk scenarios (requiring daily cleaning):
Mines, construction sites, cement/wood processing workshops (high dust concentration, easy to deposit on the inner wall of pipelines);
Oil fume/mist environment (such as kitchens, mechanical processing workshops, where oil stains can easily adhere to pipelines and cause blockages);
Medium risk scenario (1-2 cleanings per week):
Ordinary factory workshops and warehouses (with a small amount of dust and no obvious oil stains);
Outdoor environment (such as road monitoring, park inspections, and possible dust);
Low risk scenario (clean once every 2-4 weeks):
Laboratory and cleanroom (with low dust concentration and controlled environment);
Indoor office area, conventional gas monitoring points (without obvious pollutants).
2. Characteristics of transmission medium (corrosiveness and viscosity of gas/sample)
Corrosive gases (such as chlorine, ammonia, acidic gases):
This type of gas is prone to react with pipeline materials (such as aging rubber pipes, corrosion of metal pipes), resulting in sedimentation or blockage of pipelines. It is necessary to shorten the cleaning frequency (2-3 times a week) and regularly check whether the pipelines are cracked or brittle;
Containing viscous/condensing media (such as high humidity gases, oily vapors):
After condensation of water vapor, it is easy to mix with dust to form muddy sediment. The viscous medium directly adheres to the inner wall of the pipeline and needs to be cleaned 1-2 times a week. If necessary, a condensation filter should be installed at the front end of the pipeline to reduce pollution;
Inert gases (such as nitrogen and argon):
Non corrosive, non sticky, low pollution risk, can be cleaned according to low-risk scenario frequency (every 2-4 weeks).
3. Instrument usage frequency and duration
High frequency use (daily use for more than 8 hours, such as continuous monitoring equipment):
The gas flow in the pipeline is large, the accumulation rate of pollutants is fast, and the cleaning frequency needs to be doubled (such as changing from once a week to twice a week);
Low frequency use (1-2 times a week, such as occasional sampling of portable devices):
Although the accumulation of pollutants is slow, there may be residual gas or moisture in the pipeline when it is idle, which can lead to bacterial growth (especially in rubber pipes). It is necessary to clean it briefly after each use (such as blowing off the residue with compressed air) and conduct a comprehensive cleaning once a month.
4. Detection data feedback (abnormal signal triggers cleaning)
When the following situations occur, regardless of whether it is the regular cleaning time, the pipeline should be cleaned immediately:
Slow response speed of the instrument (such as delayed updating of instrument values after changes in gas concentration);
Drift of detection results (deviation from standard gas calibration results exceeding the allowable range);
Abnormal alarm (false alarm when there is no gas, or no alarm when there is gas);
Increased intake resistance (such as abnormal sound or insufficient flow when a portable instrument inhales).
5. Pipeline material and length
Pipeline material:
Rubber and silicone tubes (easy to adsorb oil and dust, soft material and prone to residual pollutants): The cleaning frequency should be twice as high as that of metal tubes (stainless steel, copper) (such as cleaning metal tubes every 2 weeks and rubber tubes once a week);
Polytetrafluoroethylene (PTFE) tube (highly inert, not easily adhered to pollutants): can be extended by 50% according to conventional frequency (such as changing from once a week to once every 1.5 weeks);
Pipeline length:
Long pipelines (over 1 meter): The gas circulation path is long, and pollutants are prone to deposit in the middle section. The cleaning frequency is twice as high as that of short pipelines (≤ 50cm), and segmented blowing is required during cleaning (blowing from the inlet end to the outlet end to avoid pollutants pushing towards the sensor).
6. Requirements for special application scenarios
Explosion proof/toxic gas detection scenarios (such as chemical parks, gas stations):
Pipeline blockage or contamination may cause detection failure and safety accidents. It is necessary to strictly shorten the cleaning frequency (daily cleaning for high-risk environments, twice a week for medium risk environments), and perform zero point calibration after cleaning;
Medical and food industries (such as operating rooms and food processing workshops):
High hygiene requirements are required, and the pipeline should avoid bacterial growth. When cleaning, the outer wall should be wiped with a sterile cloth, and the inner wall should be blown away with sterile compressed air, with a frequency of 1-2 times a week. If necessary, isopropanol should be used for disinfection (ensuring complete evaporation of alcohol before use).