ZS8100-HCl Process Hydrogen Chloride Analyzer

HCl is strongly water-soluble and has a dew point well above ambient in wet stack gas — a 10 %vol H2O incineration flue stream condenses to an acidic film on any cold surface, stripping HCl into the drop-out before the cell ever sees the molecule. EN 1911 (stationary-source HCl reference method) and US EPA Method 321 both require heated sample paths held 20 °C above the local dew point, typically ≥180 °C, with HCl-resistant wetted parts. A Peltier cool-dry chain removes the water but carries the HCl with it — the classic failure mode when operators reuse a CO / NOx chain for HCl duty. The ZS8100-HCl is therefore specified with the ZS-SCS-800 Hastelloy heated sampling system as a matched set; ambient / cool-dry deployment is not a supported configuration.

The near-IR HCl overtone line at ~1.74 μm sits in a laser-resolved window where the TDLAS system tunes across the line centre at MHz-scale resolution. Broadband NDIR photometers can struggle to separate the HCl feature from the H2O continuum or the CO2 / SO2 / HF overlap in this matrix. The TDLAS first-derivative fit separates the wing absorbers and reports HCl against the local line shape. For incineration CEMS this supports EPA Method 321-aligned engineering review, QAL2 preparation, and AST field-audit planning.

The EU IED Annex VI daily ELV for incineration HCl is 10 mg/Nm³ referenced to 11 %vol O2 dry — approximately 6 ppm at reference conditions. The 0–50 ppm firmware range is the primary CEMS range for this duty; the 0–200 ppm range handles boiler upsets and the 0–5000 ppm range handles chlor-alkali cell-room and PVC / VCM process vent loops. Firmware switches the configured range without optics change, so one analyzer carries both the compliance range and the process-upset range on the same signal chain. Report units (ppm vs mg/m³, dry vs wet, 11 %vol O2 normalized) are set in the HMI and locked behind operator-level access.

CE marking and ISO 9001:2015 manufacturing are standard. MCERTS (UK, certifying body Sira) and US EPA Performance Specification 18 (gaseous HCl CEMS) are listed as target scope, pending completion of GESHINE own-brand hardware and documentation sign-off — certificate numbers and validity windows are not published yet. The analyzer is therefore specified as a PS-18 / MCERTS QAL1 candidate rather than an already-certified CEMS; the ATEX / IECEx hazardous-area scope is Conditional, confirmed per project before order commitment. Sales engineering will confirm the current certification status, including issuing body and certificate number, before project commit.

Yes. The ZS8100-HCl runs on the ZS8100-series platform (O2 / HF / C2H2 family in 19-inch rack / field enclosure) and is positioned as the HCl flagship for incineration CEMS and chlor-alkali. The same TDLAS HCl measurement is also available on an alternative analyzer-platform footprint for projects where a different skid and mechanical envelope fits better — typical in refinery sulfur-recovery vent and chlor-alkali compression sections already standardized on that platform. Measurement performance is comparable TDLAS in both cases; the choice is driven by skid / panel standardization, not by accuracy or range. Application engineering will confirm the platform match during the sizing review.