Precision Sulfur Dioxide Gas — accuracy for instruments that must not drift
Precision sulfur dioxide is prepared by REAL GAZ for users who measure SO₂ at low concentrations and cannot tolerate uncertainty. Our Precision Sulfur Dioxide Gas is available as pure gas and as blends in nitrogen or air, with concentrations stated on the certificate.
Preparation follows gravimetric principles, so the value on the label is linked to mass, not estimation.
Preparation follows gravimetric principles, so the value on the label is linked to mass, not estimation.
REAL GAZ supplies this product according to ISO 6142-1 gravimetric preparation, ISO 6143 comparison methods and ISO 17025 competence requirements, suitable for industrial and laboratory use.
Typical blends run from a few ppm up to several percent SO₂ in nitrogen, with expanded uncertainty stated on the certificate. For emissions work, reference mixtures can be matched to the ranges used by continuous monitors, and multi-component blends with NO, CO and CO₂ can be prepared in the same cylinder.
🏭 Where Precision SO₂ Is Used
- 🌫️ Stack and ambient monitors — span and zero checks for UV-fluorescence and NDIR analysers;
- 🔬 Method validation — linearity and repeatability studies in environmental laboratories;
- 🏭 Refinery and smelter control — verification of process analysers in sulfur-bearing streams;
- 🛰️ Atmospheric research — reference material for field campaigns measuring trace sulfur species.
💡 Why Choose REAL GAZ
- ✅ Gravimetric accuracy — concentrations are derived from weighed components, not guesswork;
- 🧪 Passivated cylinders — treated internal surfaces help low-ppm SO₂ blends stay stable over time;
- 🎯 Tolerance by request — choose blending tolerance and analytical uncertainty to suit your method;
- 🔒 Stated shelf life — each blend carries a validity period so you know when to re-verify;
- 📄 Certificate of Analysis (CoA) — supplied with every order.
🔬 Quality Control & Safety
- gravimetric blending on calibrated balances;
- independent analytical verification against reference standards;
- moisture control during filling;
- leak testing and valve integrity inspection.
Low-concentration sulfur dioxide adsorbs on dirty or wet surfaces. Use stainless steel or PTFE tubing, keep lines short and purge thoroughly before reading. Do not use a blend beyond its stated expiry or below its minimum cylinder pressure.
Cylinders comply with ADR / UN transport rules and relevant EN/ISO standards.
⚙️ Trusted Gas Solutions
REAL GAZ provides Precision Sulfur Dioxide Gas for monitoring, research and quality teams in Azerbaijan, Turkey, Georgia, Uzbekistan and the USA. Tell us your range and uncertainty target, and we will propose a blend and cylinder configuration that fits your analyser.
Choosing the right cylinder matters as much as the blend: aluminium cylinders with a passivated inner surface minimise losses of reactive SO₂ at low levels. We recommend ordering ahead of calibration deadlines, so stability testing is complete before the cylinder arrives in your laboratory.
We can also supply matching zero gas and mid-range checks, so a single order covers the full calibration sequence required by your monitoring permit. Certificates are provided in electronic form for inclusion in your quality records.
REAL GAZ — measure with confidence.