TH-YC8H Sulfuric Acid Mist Sampling Probe with Integrated Constant-Temperature Ice Bath

Overview

The TH-YC8H Sulfuric Acid Mist Sampling Probe is an engineered field instrument designed for accurate, compliant, and simultaneous collection of both particulate-phase and gaseous-phase sulfuric acid (H₂SO₄) emissions from stationary source exhaust stacks. It operates on the Venturi proportional splitting principle—ensuring isokinetic sampling of particulates while maintaining stoichiometric proportionality for vapor-phase sulfate species. This dual-mode sampling architecture directly addresses the analytical challenge posed by the coexistence of aerosolized sulfuric acid droplets and uncondensed gaseous H₂SO₄ in flue gas streams. The probe conforms strictly to Chinese national standards GB/T 16157–1996 (Determination of Particulates and Gaseous Pollutants in Stationary Source Exhaust) and HJ 544–2016 (Determination of Sulfuric Acid Mist in Stationary Source Exhaust Using Ion Chromatography), making it suitable for regulatory monitoring programs requiring trace-level sulfate quantification via IC, ICP-MS, or gravimetric analysis.

Key Features

• Venturi-based proportional splitter ensures real-time isokinetic sampling of particulates and proportional capture of gaseous sulfuric acid across variable stack velocities (typically 5–30 m/s)
• Integrated constant-temperature ice bath maintains absorption media at 0–4 °C during sampling—critical for suppressing H₂SO₄ volatilization from impinger solutions and minimizing artifact formation
• Modular heated probe section (adjustable 50–180 °C) prevents condensation upstream of the splitter and preserves sample integrity in high-humidity or low-temperature exhaust conditions
• Four-position 75 mL impinger rack accommodates standard multi-stage absorption trains (e.g., first stage: 0.1 M NaOH for gaseous H₂SO₄; second stage: water or dilute H₂O₂ for residual aerosols)
• Embedded S-type Pitot tube and calibrated K-type thermocouple enable concurrent velocity, temperature, and differential pressure measurement—supporting full isokinetic calculation per GB/T 16157
• Lightweight aluminum alloy construction (<2.8 kg) facilitates single-operator deployment in confined or elevated sampling locations
• Universal 1/2″ NPT and ISO-KF interface compatibility allows seamless integration with domestic and international sampling systems—including but not limited to崂应 (LaoYing), 恒奥德 (HengAode), and certified EU/US portable samplers rated up to 100 L/min

Sample Compatibility & Compliance

The TH-YC8H is validated for use with aqueous alkaline absorbents (e.g., 0.1 M NaOH, 3% H₂O₂), deionized water, and mixed-solution protocols specified in HJ 544–2016. Its design mitigates common interferences such as SO₂ breakthrough (via optimized residence time and cooling), ammonium sulfate salt precipitation (through controlled thermal gradient management), and adsorptive loss on stainless-steel surfaces (achieved via electropolished internal pathways). All wetted materials comply with EPA Method 205 and ISO 12141 requirements for inertness toward strong acids. Documentation includes factory calibration certificates for Pitot tube coefficient (C_p = 0.84 ± 0.02) and thermocouple traceability to NIM (National Institute of Metrology, China). Full compliance documentation supports GLP-aligned data generation and audit readiness under China’s MEP Order No. 39 and local environmental monitoring accreditation frameworks.

Software & Data Management

While the TH-YC8H is a hardware-only sampling tool, its output integrates natively with third-party stack emission data acquisition systems (e.g., LaoYing 3012H, HengAode HD-5G) supporting RS-232/485 or analog 4–20 mA outputs. Field-collected parameters—including stack temperature, velocity pressure, static pressure, and real-time flow rate—are timestamped and logged alongside laboratory IC results to satisfy traceability requirements under CNAS-CL01:2018. When paired with compliant data loggers, the system meets basic ALCOA+ principles (Attributable, Legible, Contemporaneous, Original, Accurate, Complete, Consistent, Enduring, Available) for environmental monitoring records.

Applications

• Regulatory compliance monitoring at sulfuric acid production facilities, phosphate fertilizer plants, metal pickling lines, and coal-fired power stations with wet flue gas desulfurization (WFGD)
• Source testing for sulfuric acid mist emission inventories under China’s “Blue Sky Defense Campaign” and provincial VOCs/SOₓ control plans
• Method validation studies comparing ion chromatography (HJ 544–2016) against alternative techniques such as ICP-OES or colorimetric barium chloride assays
• Stack characterization during commissioning of mist eliminators, wet electrostatic precipitators (WESPs), and packed-bed scrubbers
• Research-grade sampling for atmospheric chemistry modeling of secondary sulfate aerosol formation potential

FAQ

Does the TH-YC8H require external power for the ice bath?
No—the integrated ice bath is passive and relies on pre-chilled gel packs or crushed ice; no battery or AC supply is needed.
Can the heated section be used simultaneously with the ice bath?
Yes. The probe employs thermally decoupled zones: the upstream heater maintains duct wall temperature, while the downstream impinger chamber remains actively cooled—enabling true dual-phase stabilization.
Is calibration of the Venturi splitter required before each use?
No. The splitter is factory-calibrated and sealed; field verification is performed via Pitot traverse and flow balance check per GB/T 16157 Annex B.
What is the maximum allowable flue gas moisture content?
The probe is rated for ≤90% relative humidity at 180 °C; condensate management is handled via heated sampling line and coalescing filter (not included).