How We Qualify Suppliers
Four sub-assembly groups drive analyzer performance. Each is sourced against a documented qualification standard, re-audited on a cadence, and traced to the serial number of the unit you receive.
Your measurement is only as stable as our weakest upstream lot.
Gas analyzers live in the tail of the supply chain — their accuracy and compliance depend on optics that don’t drift, calibration gases that stay within spec, and enclosures that keep the outside out. A weak lot anywhere upstream shows up as a deviation in your plant data.
So we apply the same discipline we expect our customers to apply to us. Every sub-assembly group below has entry criteria, audit evidence, and a re-audit cadence. Procurement buyers who inherit our analyzers inherit this chain — and the traceability comes with the unit.
Qualification criteria per group
Each group carries a distinct failure mode. The criteria are tuned to the failure we are pre-empting, not a generic checklist.
Optical Core
Laser diodes · photodetectors · optical cells · filter wheels
Audit Criteria
- Lot traceability and wavelength-stability data
- Temperature / vibration tolerance evidence
- Long-term drift data (≥ 12 months)
- Second-source qualification where available
Failure Mode We Pre-empt
Wavelength drift and detector aging go unnoticed without upstream evidence — lots without it are held or rejected under incoming-QC rules.
Sampling & Conditioning
Probes · heated lines · condensers · filters · pumps · flow meters · valves
Audit Criteria
- Wetted-material compatibility against the target gas list
- Heat-trace temperature uniformity certificate
- Pressure rating & leak-tightness validation
- MTBF data for pumps and flow meters
Failure Mode We Pre-empt
Conditioning hardware determines whether the analyzer ever sees the real sample — a weak link here invalidates the rest.
Conversion & Calibration Gases
NOx converter catalysts · 99.99% N₂ zero · span calibration gases
Audit Criteria
- Conversion efficiency certificate (NOx converter)
- Certified gas concentration with expiry date
- Traceable reference standards
- Supplier ISO 17025 or equivalent accreditation
Failure Mode We Pre-empt
A calibration is only as good as the gas behind it — and compliance auditors will ask.
Electronics & Enclosure
Signal-processing boards · RS485 / 4-20 mA I/O · Ex-proof enclosures
Audit Criteria
- Ex db IIC T6 Gb compliance (GB/T 3836.1 / 3836.2)
- IP55 / IP67 ingress-protection certification
- EMC immunity test report
- Functional-safety (SIL) evidence for safety-rated parts
Failure Mode We Pre-empt
Hazardous-area deployment leaves no room for enclosure compromises — we keep Ex-proof evidence in the audit trail.
Four stages from dossier to Approved Vendor List
Qualification dossier
New supplier submits lot capability, quality-system evidence (ISO 9001 / 17025 where relevant), and sample evidence per sub-assembly group.
Pilot lot acceptance
Pilot lot is tested against the same incoming-QC criteria the final assembly will see. Lot data joins the supplier record, not just the individual unit.
Production approval
Approved suppliers enter the Approved Vendor List with documented scope. First-time-use in a safety-rated analyzer requires an additional reliability gate.
Periodic re-audit
Approved suppliers are re-audited on a scheduled cadence plus on any drift signal, failure report, or regulation change. Re-audit outcome is dated in the record.
The supply chain ships with the analyzer.
Your procurement and compliance teams do not have to chase upstream evidence after the fact. It is already keyed to the serial number you receive.
- Where a sub-assembly is partner-sourced, the supplier’s certificates and audit evidence travel with the finished analyzer’s qualification package.
- Lot numbers on calibration gases, NOx converters, and optical components are logged to the analyzer serial number — procurement auditors can trace any specific unit.
- Second-source qualification is maintained for laser diodes and calibration gases to protect supply continuity during lead-time shocks.