Freelance projects

Freelance projects

Gas sampling probe - CAD drawing (or only 3D model)

Drawings & Diagrams, Mechanical Engineering & Instrument Making — incorrectly specified categories?

250 USD

Client's review of cooperation with Vladyslav B.

Gas sampling probe - CAD drawing (or only 3D model)

250 USD

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.

5.0

Yuriy Karnaukhov

Reciprocal Feedback

12 September 2025

Freelancer's review of cooperation with Yuriy Karnaukhov

Gas sampling probe - CAD drawing (or only 3D model)

250 USD

Honestly and effectively
A big thank you to the client

5.0

Vladyslav B.

Reciprocal Feedback

15 September 2025

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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:
1. After the electrostatic precipitator — average 160 °C, peak up to 250 °C.
2. 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.

Update #1 from 9 August 2025

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.

Proposals 3 Discussions 1

Please select

Vladyslav B.

Winning proposal

47 2

Budget: 250 USD Deadline: 8 days

Good afternoon
I have experience in developing a similar system
I can arrange everything properly

Aleksey I.

186 1

Budget: 250 USD Deadline: 8 days

Good day. Ready to complete your task, please contact me, I will be happy to help

Mykola P.

81 0

Budget: 250 USD Deadline: 7 days

Hello. I am ready to complete your task. Write to discuss all the details

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Yuriy Karnaukhov
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