KOMYO RIKAGAKU Toluene Gas Detection Tubes Model 124SA / 124SB / 124SH

Overview

KOMYO RIKAGAKU Toluene Gas Detection Tubes (Models 124SA, 124SB, and 124SH) are precision-engineered colorimetric gas sampling devices for rapid, on-site quantification of toluene vapor concentrations in ambient air. Based on the established North-Kawakami (Kitagawa-type) detection tube principle, each tube contains a fixed-length glass column pre-filled with a chemically selective reagent—typically a sulfonated chromogenic compound—that undergoes a stoichiometric, diffusion-controlled reaction with toluene. Upon drawing a defined volume of air (100 mL standard, using the AP-20 hand pump), toluene molecules react along the silica gel or porous carrier matrix, generating a discrete color front. The length of the stained zone is linearly proportional to concentration and is read directly against the calibrated scale printed on the tube body. This method delivers immediate semi-quantitative results without power, calibration gases, or software—making it ideal for first-response scenarios, industrial hygiene spot checks, confined space entry verification, and leak screening in petrochemical, paint, printing, and solvent-handling facilities.

Key Features

• Three complementary range options: 124SB (2–100 ppm) for low-level occupational exposure assessment; 124SA (10–500 ppm) for general workplace monitoring; and 124SH (100–3000 ppm) for high-concentration emergency response or process off-gas evaluation.
• Manufactured in Japan under strict JIS K 0804 quality control protocols, ensuring batch-to-batch reproducibility and shelf-life stability (typically 24 months from manufacture when stored at ≤30°C and protected from light).
• Compatible exclusively with the KOMYO AP-20 dual-stroke bellows pump (sold separately), which delivers precise 100 mL ±5% draw volume per stroke—critical for maintaining measurement accuracy per ISO 8573-6 Annex B guidance on manual sampling systems.
• Each tube is individually sealed in aluminum-laminated foil packaging to preserve reagent integrity; includes lot-specific expiration date and traceable manufacturing code.
• No electronic components, batteries, or firmware—eliminates drift, sensor poisoning, or cross-sensitivity issues common in electrochemical or PID-based instruments.

Sample Compatibility & Compliance

These tubes are validated for use in clean, dry air matrices. High humidity (>85% RH), aerosols, or co-existing solvents such as xylene, ethylbenzene, or acetone may cause interference or overestimation due to shared reactivity pathways; refer to KOMYO Technical Bulletin TB-021 for documented interferences. The 124-series complies with Japanese Industrial Standard JIS K 0804:2019 “Gas Detection Tubes – General Rules”, and supports compliance with OSHA 1910.120 (HAZWOPER) and ACGIH TLV® documentation requirements when used within defined procedural limits. While not certified for regulatory reporting under EPA Method TO-17 or ISO 16000-6, they serve as validated screening tools aligned with NIOSH Manual of Analytical Methods (NMAM) Chapter 6000 protocols for qualitative/semi-quantitative field triage.

Software & Data Management

The 124SA/124SB/124SH detection tubes operate independently of software or digital infrastructure. All data acquisition is manual: users record tube lot number, sampling time, location, pump strokes, observed stain length, and environmental conditions (temperature, relative humidity) in field logbooks or LIMS-integrated paper forms. For audit readiness, KOMYO provides Certificate of Analysis (CoA) with each production lot, including reference concentration validation data against gravimetrically prepared standards. No electronic data capture, cloud upload, or 21 CFR Part 11 compliance is applicable—consistent with GLP-aligned paper-based field workflows where instrument independence and chain-of-custody transparency are prioritized.

Applications

• Routine industrial hygiene surveys for toluene exposure near dip tanks, spray booths, and solvent recovery units.
• Emergency response during transportation incidents involving toluene-containing cargo (e.g., tank truck rollovers, railcar leaks).
• Pre-entry verification of atmospheric safety in storage tanks, reactors, or wastewater lift stations prior to maintenance.
• Educational laboratory demonstrations of gas-phase reaction kinetics and diffusion-controlled color development.
• Baseline screening in indoor air quality assessments following renovation with solvent-based adhesives or coatings.

FAQ

What is the recommended sampling volume for all three models?
100 mL per tube, drawn using two full strokes of the AP-20 pump (50 mL/stroke). Deviations beyond ±5% invalidate concentration interpretation.
Can these tubes be reused after initial sampling?
No. Each tube is a single-use, disposable analytical device. Reuse introduces carryover, inconsistent flow resistance, and non-linear color development.
How should unused tubes be stored?
In original foil pouches, at temperatures between 5°C and 30°C, away from direct sunlight and organic solvent vapors. Do not refrigerate.
Is there a documented uncertainty budget for this method?
Per JIS K 0804, typical expanded uncertainty (k=2) is ±25% for concentrations within the central 50% of the scale; higher near range endpoints. Full uncertainty analysis requires documenting pump calibration, observer bias, and ambient temperature effects.
Are replacement reagents or refills available?
No. KOMYO does not supply refill kits. Tubes are factory-sealed and cannot be recharged or recalibrated in the field.