Gas sampling probe - CAD drawing (or only 3D model)
250 USD Project:
System for sampling and analyzing flue gases (dust + CO₂) for tubular electrostatic precipitator in fireplace installations.
Objective:
Design in CAD (2D + 3D) a system that allows sampling gases at two points, cooling them, and supplying to SEN54 and SCD41 sensors. Also, ensure that no condensation occurs.
1. Operating Conditions
Gas flow is created by a fan after the electrostatic precipitator.
Working environment: dry flue gases, high dust content.
Temperatures:
After the electrostatic precipitator — average 160 °C, peak up to 250 °C.
At the oven outlet (before the filter) — up to 100 °C.
Maximum temperature in the analysis chamber — 46 °C.
Sensors:
SEN54 — dust, temperature, humidity.
SCD41 — CO₂.
Operating mode: 2 minutes/hour, 24 V membrane pump, 0.3–0.5 l/min.
2. What needs to be designed
2.1 Sampling probes (2 pcs.)
First probe — after the electrostatic precipitator.
Second probe — at the oven outlet, before the filter.
Material: stainless steel 316L, Ø 6 mm.
Tip shape: “spoon” (angled end with side opening).
Inclination: 5–10° downward along the flow.
Insertion depth: 30–50 mm.
At the end of each probe — sintered filter 20–40 μm (stainless steel).
2.2 Sampling line from probe to chamber
PTFE tube Ø 6×4 mm.
For the probe after the filter: length ≥ 1.5 m (gas cooling to ~25–30 °C).
For the probe before the filter: length according to installation (cooling as needed).
Before the chamber — common drain-settler 30–50 ml.
2.3 Sample analysis chamber
Material: aluminum or stainless steel 316L.
Volume: 0.25 L.
Interior matte black (to eliminate reflections).
Outside — aluminum radiator 40×40 mm.
Placement of SEN54 and SCD41 sensors in one airflow.
Pressure compensation: hole Ø 3–4 mm with PTFE membrane IP66.
Cable routing: through cable glands with heat resistance and IP66, outlet towards electrical compartment.
2.4 Sampling and exhaust system
Check valve.
24 V membrane pump, 0.3–0.5 l/min.
Exhaust gas outside or back into the pipe.
3. Expected deliverables
3D model in STEP/IGES format + CAD source files.
Drawings with dimensions and materials.
Cross-section of the probe tip.
Cross-section of the chamber with sensor placement.
Gas flow diagram from both probes.
Cable and connection routing.
Functionality demonstration.
Your ideas.
I am attaching photos of the pipe before and after the filter. And an approximate diagram.
Explanations for the Technical Specification: Flue Gas Sampling and Analysis System
Project goal:
Create a system that will collect a flue gas sample at two points in the duct (before and after the electrostatic precipitator), cool it, and supply it to SEN54 sensors (fine dust PM1–PM10, temperature, humidity) and SCD41 (CO₂).
The main task is to obtain accurate readings without distortions from condensation, dust deposition, and air intake.
Key parameters and requirements:
Two sampling points:
After the electrostatic precipitator — on a straight section of pipe before the fan (at least 30 cm from the nearest bend).
Before the electrostatic precipitator — on a straight section before its inlet (distance from bend).
Probe: stainless steel 316L, Ø6 mm, «spoon» shape, insertion into flow 30–50 mm, tilt 5–10° downward along the flow. Sinter filter at the end 20–40 μm. Insulate the first 20–30 cm.
Sampling line: PTFE tube Ø6×4 mm. After the filter — length ≥1.5 m for natural cooling. In front of the chamber — common drainage sediment trap 30–50 ml.
Analysis chamber: volume ~0.25 liters, aluminum or stainless steel 316L, matte black inside, radiator 40×40 mm outside, pressure compensation via PTFE membrane IP66. Sensors SEN54 and SCD41 in one flow.
Sampling system: membrane pump 24 V, 0.3–0.5 l/min, draws gas through the chamber, then — check valve, outlet outside or into the duct.
Installation: minimal bends and constrictions, slope towards drainage, no «siphons», quick-release fittings, ability to purge with clean air.
Why these requirements are important:
Straight sections are needed for uniform gas and dust flow, otherwise measurements will be inaccurate.
Thermal insulation of the first 20–30 cm prevents rapid cooling and condensation directly in the probe filter.
Drainage prevents moisture from reaching the sensors.
Natural cooling (1.5 m of tube) allows reducing the gas temperature without a complex heat exchanger.
Probe window along the flow provides a representative dust sample, not «drawing» large particles from the wall.
Пояснения к ТЗ: система отбора и анализа дымовых газов
Цель проекта:
Создать систему, которая будет забирать пробу дымовых газов в двух точках газохода (до и после электрофильтра), охлаждать её и подавать на датчики SEN54 (мелкодисперсная пыль PM1–PM10, температура, влажность) и SCD41 (CO₂).
Основная задача — получить корректные показания без искажений от конденсата, осаждения пыли и подсоса воздуха.
Ключевые параметры и требования:
Две точки отбора:
После электрофильтра — на прямом участке трубы до вентилятора (минимум 30 см от ближайшего изгиба).
До электрофильтра — на прямом участке перед его входом (отступ от изгиба).
Зонд: нержавейка 316L, Ø6 мм, форма «ложка», ввод в поток 30–50 мм, уклон 5–10° вниз по потоку. На конце синтер-фильтр 20–40 мкм. Первые 20–30 см термоизолировать.
Линия пробы: PTFE-трубка Ø6×4 мм. После фильтра — длина ≥1,5 м для естественного охлаждения. Перед камерой — общий дренаж-отстойник 30–50 мл.
Камера анализа: объём ~0,25 л, алюминий или нерж. 316L, матово-чёрная внутри, радиатор 40×40 мм снаружи, компенсация давления через PTFE-мембрану IP66. Датчики SEN54 и SCD41 в одном потоке.
Система прокачки: мембранная помпа 24 В, 0,3–0,5 л/мин, тянет газ через камеру, после неё — обратный клапан, отвод наружу или в газоход.
Монтаж: минимум изгибов и сужений, уклон к дренажу, без «сифонов», быстросъёмные фитинги, возможность продувки чистым воздухом.
Почему важны эти требования:
Прямые участки нужны для равномерного потока газа и пыли, иначе замеры будут неточными.
Термоизоляция первых 20–30 см исключает резкое охлаждение и выпадение конденсата прямо в фильтре зонда.
Дренаж предотвращает попадание влаги в датчики.
Естественное охлаждение (1,5 м трубки) позволяет снизить температуру газа без сложного теплообменника.
Окно зонда по потоку даёт репрезентативную пробу пыли, не «тянущую» крупные частицы со стенки.
Applications 3
Client's review of cooperation with Vladyslav B.
Gas sampling probe - CAD drawing (or only 3D model)The performer demonstrated a high level of professionalism and responsibility during the development of the probe scheme for gas sampling. All tasks were completed with quality, on time, and without errors. I would like to especially note his stress resistance; even in difficult situations, he maintained calmness and focus, which positively influenced the work result.
Freelancer's review of cooperation with Yuriy Karnaukhov
Gas sampling probe - CAD drawing (or only 3D model)Honestly and effectively
A big thank you to the client
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Winning proposal8 days250 USD
3842 47 2 Winning proposal8 days250 USDGood afternoon
I have experience in developing a similar system
I can arrange everything properly
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8 days250 USD
10438 183 1 1 8 days250 USDGood day. Ready to complete your task, please contact me, I will be happy to help
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7 days250 USD
6755 77 0 1 7 days250 USDHello. I am ready to complete your task. Write to discuss all the details
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