KOMYO RIKAGAKU North川-Type Furfural Gas Detection Tube (Model 190U@)

Overview

The KOMYO RIKAGAKU North川-Type Furfural Gas Detection Tube (Model 190U@) is a single-use, colorimetric dosimeter designed for rapid, on-site quantification of furfural (2-furaldehyde) vapor in ambient air. Developed under the legacy “Kitagawa” tube standard—pioneered by Dr. North川 (Kitagawa) in post-war Japan—the system relies on a stoichiometric, diffusion-controlled reaction between furfural and a proprietary solid-phase reagent (typically a sulfanilic acid–formaldehyde–acid catalyst formulation) immobilized inside a calibrated glass tube. Upon manual aspiration using the AP-20 dual-stroke hand pump (100 mL per stroke, ±5% volume tolerance), sampled air passes through the reagent bed; furfural induces a localized chromogenic zone whose length is linearly proportional to concentration. The tube’s printed scale—calibrated against NIST-traceable furfural standards—enables direct visual readout in parts per million (ppm) within 60 seconds. This method complies with the fundamental principles of ISO 8573-2 for qualitative/semi-quantitative gas analysis and aligns with Japanese Industrial Standard JIS K 0321 for detector tube performance validation.

Key Features

• Pre-calibrated linear range: 2–60 ppm furfural, with ±15% accuracy at 23 °C and 50% RH (per JIS K 0321 repeatability criteria)
• Single-use borosilicate glass construction with hermetically sealed ends; shelf life ≥24 months when stored at 5–30 °C in original packaging
• No power, no software, no calibration gases required—operational independence ideal for field deployment, confined space entry, or emergency response
• Compatible with universal AP-20 hand pump (standard 100 mL stroke volume); pump also supports >300 KOMYO gas detection tubes across VOCs, inorganic toxics, and combustion byproducts
• Traceable batch certification included: each tube lot undergoes gravimetric verification against certified furfural reference gas mixtures (NMIJ/JCSS traceability)

Sample Compatibility & Compliance

The 190U@ tube is validated for use in clean, dry air matrices. High humidity (>80% RH), particulate loading (>1 mg/m³), or co-presence of strong oxidizers (e.g., chlorine, NO₂) may interfere with color development and require pre-filtration or parallel blank correction. The tube meets requirements for occupational exposure assessment under Japan’s Industrial Safety and Health Act (ISHA) Article 62 and is referenced in the Ministry of Health, Labour and Welfare (MHLW) Guideline on Workplace Air Monitoring (2021 Edition). While not FDA 21 CFR Part 11 compliant (as it produces analog visual data), its documented uncertainty budget, lot-specific calibration certificates, and adherence to JIS K 0321 support GLP-aligned recordkeeping when paired with standardized observation logs.

Software & Data Management

As an analog, visual-readout device, the 190U@ tube does not interface with digital systems or generate electronic data streams. However, quantitative results may be transcribed into LIMS or EHS platforms via structured manual entry. KOMYO provides downloadable PDF datasheets (including interference tables, temperature/humidity correction charts, and uncertainty statements) for each lot number. For audit readiness, users are advised to retain used tubes alongside dated, signed observation records—consistent with ISO/IEC 17025 clause 7.8.2 on result reporting integrity.

Applications

• Routine monitoring of furfural emissions during biomass thermal processing (e.g., rice husk pyrolysis, corn cob hydrolysis)
• Leak detection and source identification in resin manufacturing facilities where furfural is used as a solvent or intermediate
• Emergency response triage following transport incidents involving furfural cargo (UN 2810, Class 6.1)
• Verification of local exhaust ventilation (LEV) effectiveness in pharmaceutical synthesis labs handling furan derivatives
• Compliance screening against Japan’s Workplace Environmental Measurement Standards (WEMS) threshold limit value (TLV-TWA: 5 ppm)

FAQ

Is the 190U@ tube suitable for continuous monitoring?
No. It is a discrete, single-measurement tool requiring manual pump actuation. Continuous monitoring requires electrochemical or PID-based fixed systems.
Can I use this tube with pumps other than the AP-20?
Only pumps delivering precisely 100 mL per stroke and maintaining ≤10 kPa backpressure are validated. Deviations invalidate the calibration curve.
What is the measurement uncertainty at the lower detection limit (2 ppm)?
±0.5 ppm (k=2, based on JIS K 0321 inter-laboratory reproducibility studies, n=12).
Does humidity affect the reading—and if so, how?
Yes. At 80% RH, apparent concentration increases by ~8% due to enhanced reagent hydration; correction factors are provided in the technical manual.
Are safety data sheets (SDS) available for the internal reagent?
Yes—KOMYO supplies SDS (GHS-compliant, JIS Z 7253 format) upon request for occupational hygiene risk assessment.