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Portable gas detection

MS104K-S2 Portable Single- or Two-Gas Detector

BTYQ-MS104K-S2

Front view of the Eranntex BTYQ-MS104K-S2 portable single- or two-gas detector with a color display.

Certificates & documents

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Preview of TN 754042 7.4 V 1750 mAh battery UN 38.3 test summary SSP26090210-3Test reportTN 754042 7.4 V 1750 mAh battery UN 38.3 test summary SSP26090210-3
Preview of TN 754042 7.4 V 1750 mAh battery UN 38.3 test report SSP26090210-2Test reportTN 754042 7.4 V 1750 mAh battery UN 38.3 test report SSP26090210-2
Preview of TN 754042 7.4 V 1750 mAh battery MSDS SSP26090210-1Test reportTN 754042 7.4 V 1750 mAh battery MSDS SSP26090210-1
Preview of TN 754042 7.4 V 1750 mAh battery marine transport report DSP2608263Test reportTN 754042 7.4 V 1750 mAh battery marine transport report DSP2608263
Preview of TN 754042 7.4 V 1750 mAh battery stacking test report SSP26090210-5Test reportTN 754042 7.4 V 1750 mAh battery stacking test report SSP26090210-5
Preview of TN 754042 7.4 V 1750 mAh battery 1.2 m drop test report SSP26090210-4Test reportTN 754042 7.4 V 1750 mAh battery 1.2 m drop test report SSP26090210-4
Preview of TN 754042 7.4 V 1750 mAh battery air transport report PEKSZ202609162103LYY520001Test reportTN 754042 7.4 V 1750 mAh battery air transport report PEKSZ202609162103LYY520001
Preview of Chinese IP68 test report PTC26080512701R-CN01 for BTYQ-MS104K-S2Test reportIP68 Test Report — Chinese
Preview of English IP68 test report PTC26080512701R-EN01 for BTYQ-MS104K-S2Test reportIP68 Test Report — English
Preview of explosion-proof conformity test report 2026550301 for BTYQ-MS104K-S2Test reportExplosion-proof Conformity Test Report
Preview of Chinese design patent certificate ZL 2025 3 0692599.9 for the MS104K-S2 gas detectorPatentMS104K-S2 Design Patent Certificate
Preview of Environmental Labeling (Type II) Product Verification Certificate ZII26080321001CertificateZII26080321001
Preview of explosion-proof Certificate of Conformity CCRI 26.2596X for BTYQ-MS104K-S2CertificateCCRI 26.2596X

Product overview

A portable diffusion gas detector configurable for single- or two-gas monitoring.

Single- or two-gas monitoring

BTYQ-MS104K-S2 is a compact portable diffusion gas detector configurable for single- or two-gas monitoring. Depending on the confirmed configuration, it can monitor up to two gases simultaneously. The requested gases, ranges and sensor compatibility must be confirmed.

The product uses a 7.4 V / 1750 mAh battery. Its TN 754042 battery report records 12.95 Wh for product and transport/safety documentation. A 2-inch monochrome LCD, USB-C charging and data communication, and storage for more than one million records are documented as standard.

Sampling method
Diffusion
Ingress protection
IP68
Operating temperature
-20 °C to 55 °C
Request a QuoteView specifications

Contact us to confirm the gas combination and measuring ranges for your application.

Technical specifications

Confirmed technical specifications
Sampling methodDiffusion
Ingress protectionIP68
Dimensions107 × 63 × 40 mm (L × W × H); belt-clip thickness excluded.
WeightApprox. 230 g — Weight varies by configuration.
Battery voltage7.4 V
Battery capacity1,750 mAh — TN 754042 battery report: 12.95 Wh, also represented as 3.7 V / 3500 mAh. This report supports product battery and transport/safety documentation.
Battery runtime> 48 h — With real-time 4G transmission and GPS/BeiDou positioning active, as stated in the source.
Operating temperature-20 °C to 55 °C
Display size2 in
Data storage> 1,000,000 records
Alarm volume> 95 dB — Measured at 30 cm; source also states >90 dB at 1 m.
Gas configuration
1–2 gases
Display configuration
2-inch monochrome LCD as standard; high-resolution color display optional
Relative humidity
10–95%RH
Housing material
PC + TPE
Interface languages
Chinese and English as standard; other languages customizable
Standard accessories
Calibration cap; operating instructions; product conformity document; USB charger with data cable; instrument packaging box
Optional accessories
External Bluetooth printer; protective carrying case; data SIM card

Supported gas configurations

Review the documented gas and measuring-range options, then request compatibility confirmation for the required configuration.

0 gases selected · up to 2Select one measuring range for each required gas.
Gas

Combustible Gas · EX

Measuring range0–100 %LEL
Resolution0 %LEL
Measuring range0–100 %Vol
Resolution0 %Vol
Gas

Oxygen · O₂

Measuring range0–30 %Vol
Resolution0 %Vol
Measuring range0–100 %Vol
Resolution0 %Vol
Measuring range0–5,000 ppm
Resolution1 ppm
Gas

Carbon Monoxide · CO

Measuring range0–100 ppm
Resolution0 ppm
Measuring range0–1,000 ppm
Resolution0 ppm
Measuring range0–2,000 ppm
Resolution0 ppm
Measuring range0–20,000 ppm
Resolution1 ppm
Measuring range0–100,000 ppm
Resolution1 ppm
Gas

Hydrogen Sulfide · H₂S

Measuring range0–10 ppm
Resolution0 ppm
Measuring range0–50 ppm
Resolution0 ppm
Measuring range0–100 ppm
Resolution0 ppm
Measuring range0–2,000 ppm
Resolution0 ppm
Measuring range0–10,000 ppm
Resolution1 ppm
4 of 59 gases shown · 159 gas/range options

For gases not listed in this table, contact technical sales to discuss your requirements.

Read all 159 documented gas and measuring-range options
Gas

Hydrogen Sulfide · H₂S

Measuring range0–10 ppm
Resolution0 ppm
Measuring range0–50 ppm
Resolution0 ppm
Measuring range0–100 ppm
Resolution0 ppm
Measuring range0–2,000 ppm
Resolution0 ppm
Measuring range0–10,000 ppm
Resolution1 ppm
Gas

Carbon Monoxide · CO

Measuring range0–100 ppm
Resolution0 ppm
Measuring range0–1,000 ppm
Resolution0 ppm
Measuring range0–2,000 ppm
Resolution0 ppm
Measuring range0–20,000 ppm
Resolution1 ppm
Measuring range0–100,000 ppm
Resolution1 ppm
Gas

Oxygen · O₂

Measuring range0–30 %Vol
Resolution0 %Vol
Measuring range0–100 %Vol
Resolution0 %Vol
Measuring range0–5,000 ppm
Resolution1 ppm
Gas

Methane · CH₄

Measuring range0–100 %LEL
Resolution0 %LEL
Measuring range0–100 %Vol
Resolution0 %Vol
Gas

Carbon Dioxide · CO₂

Measuring range0–20 %Vol
Resolution0 %Vol
Measuring range0–100 %Vol
Resolution0 %Vol
Measuring range0–500 ppm
Resolution1 ppm
Measuring range0–2,000 ppm
Resolution1 ppm
Measuring range0–5,000 ppm
Resolution1 ppm
Measuring range0–50,000 ppm
Resolution1 ppm
Gas

Ammonia · NH₃

Measuring range0–100 %LEL
Resolution0 %LEL
Measuring range0–50 ppm
Resolution0 ppm
Measuring range0–100 ppm
Resolution0 ppm
Measuring range0–1,000 ppm
Resolution0 ppm
Measuring range0–5,000 ppm
Resolution1 ppm
Gas

Chlorine · Cl₂

Measuring range0–10 ppm
Resolution0 ppm
Measuring range0–20 ppm
Resolution0 ppm
Measuring range0–200 ppm
Resolution0 ppm
Measuring range0–2,000 ppm
Resolution0 ppm
Gas

Sulfur Dioxide · SO₂

Measuring range0–10 ppm
Resolution0 ppm
Measuring range0–20 ppm
Resolution0 ppm
Measuring range0–100 ppm
Resolution0 ppm
Measuring range0–500 ppm
Resolution0 ppm
Measuring range0–2,000 ppm
Resolution0 ppm
Measuring range0–10,000 ppm
Resolution1 ppm
Gas

Nitric Oxide · NO

Measuring range0–10 ppm
Resolution0 ppm
Measuring range0–100 ppm
Resolution0 ppm
Measuring range0–2,000 ppm
Resolution0 ppm
Measuring range0–5,000 ppm
Resolution1 ppm
Gas

Nitrogen Dioxide · NO₂

Measuring range0–10 ppm
Resolution0 ppm
Measuring range0–100 ppm
Resolution0 ppm
Measuring range0–1,000 ppm
Resolution0 ppm
Measuring range0–5,000 ppm
Resolution1 ppm
Gas

Hydrogen · H₂

Measuring range0–100 %LEL
Resolution0 %LEL
Measuring range0–100 %Vol
Resolution0 %Vol
Measuring range0–1,000 ppm
Resolution0 ppm
Measuring range0–20,000 ppm
Resolution1 ppm
Measuring range0–40,000 ppm
Resolution1 ppm
Gas

Volatile Organic Compounds · VOC

Measuring range0–10 ppm
Resolution0 ppm
Measuring range0–10 ppm
Resolution0 ppm
Measuring range0–100 ppm
Resolution0 ppm
Measuring range0–2,000 ppm
Resolution0 ppm
Measuring range0–200,000 ppm
Resolution1 ppm
Gas

Hydrogen Cyanide · HCN

Measuring range0–30 ppm
Resolution0 ppm
Measuring range0–100 ppm
Resolution0 ppm
Gas

Hydrogen Chloride · HCl

Measuring range0–20 ppm
Resolution0 ppm
Measuring range0–200 ppm
Resolution0 ppm
Gas

Phosphine · PH₃

Measuring range0–5 ppm
Resolution0 ppm
Measuring range0–25 ppm
Resolution0 ppm
Measuring range0–2,000 ppm
Resolution1 ppm
Gas

Combustible Gas · EX

Measuring range0–100 %LEL
Resolution0 %LEL
Measuring range0–100 %Vol
Resolution0 %Vol
Gas

Chlorine Dioxide · ClO₂

Measuring range0–1 ppm
Resolution0 ppm
Measuring range0–10 ppm
Resolution0 ppm
Measuring range0–200 ppm
Resolution0 ppm
Gas

Ethylene Oxide · ETO

Measuring range0–100 %LEL
Resolution1 %LEL
Measuring range0–100 ppm
Resolution0 ppm
Measuring range0–1,000 ppm
Resolution0 ppm
Gas

Phosgene · COCl₂

Measuring range0–1 ppm
Resolution0 ppm
Measuring range0–50 ppm
Resolution0 ppm
Gas

Silane · SiH₄

Measuring range0–1 ppm
Resolution0 ppm
Measuring range0–50 ppm
Resolution0 ppm
Gas

Fluorine · F₂

Measuring range0–1 ppm
Resolution0 ppm
Measuring range0–10 ppm
Resolution0 ppm
Measuring range0–50 ppm
Resolution0 ppm
Gas

Hydrogen Fluoride · HF

Measuring range0–10 ppm
Resolution0 ppm
Measuring range0–50 ppm
Resolution0 ppm
Gas

Formaldehyde · CH₂O

Measuring range0–10 ppm
Resolution0 ppm
Measuring range0–10 ppm
Resolution0 ppm
Measuring range0–100 ppm
Resolution0 ppm
Measuring range0–5,000 ppm
Resolution1 ppm
Gas

Hydrogen Bromide · HBr

Measuring range0–50 ppm
Resolution0 ppm
Gas

Diborane · B₂H₆

Measuring range0–10 ppm
Resolution0 ppm
Gas

Arsine · AsH₃

Measuring range0–1 ppm
Resolution0 ppm
Measuring range0–10 ppm
Resolution0 ppm
Measuring range0–50 ppm
Resolution0 ppm
Gas

Ozone · O₃

Measuring range0–20 mg/L
Resolution0 mg/L
Measuring range0–1 ppm
Resolution0 ppm
Measuring range0–5 ppm
Resolution0 ppm
Measuring range0–50 ppm
Resolution0 ppm
Measuring range0–100 ppm
Resolution0 ppm
Measuring range0–2,000 ppm
Resolution0 ppm
Measuring range0–30,000 ppm
Resolution1 ppm
Gas

Germane · GeH₄

Measuring range0–2 ppm
Resolution0 ppm
Measuring range0–20 ppm
Resolution0 ppm
Gas

Hydrazine · N₂H₄

Measuring range0–1 ppm
Resolution0 ppm
Measuring range0–300 ppm
Resolution0 ppm
Gas

Tetrahydrothiophene · THT

Measuring range0–100 mg/m3
Resolution0 mg/m3
Gas

Bromine · Br₂

Measuring range0–10 ppm
Resolution0 ppm
Measuring range0–100 ppm
Resolution0 ppm
Measuring range0–2,000 ppm
Resolution1 ppm
Gas

Acetylene · C₂H₂

Measuring range0–100 %LEL
Resolution0 %LEL
Measuring range0–100 ppm
Resolution0 ppm
Measuring range0–1,000 ppm
Resolution0 ppm
Gas

Ethylene · C₂H₄

Measuring range0–100 %LEL
Resolution0 %LEL
Measuring range0–100 ppm
Resolution0 ppm
Measuring range0–2,000 ppm
Resolution0 ppm
Gas

Ethanol · C₂H₆O

Measuring range0–100 ppm
Resolution0 ppm
Measuring range0–2,000 ppm
Resolution1 ppm
Gas

Methanol

Measuring range0–100 ppm
Resolution0 ppm
Measuring range0–2,000 ppm
Resolution1 ppm
Gas

Nitrogen Oxides · NOₓ

Measuring range0–10 ppm
Resolution0 ppm
Measuring range0–100 ppm
Resolution0 ppm
Measuring range0–2,000 ppm
Resolution0 ppm
Measuring range0–5,000 ppm
Resolution1 ppm
Gas

Carbon Disulfide · CS₂

Measuring range0–50 ppm
Resolution0 ppm
Measuring range0–5,000 ppm
Resolution0 ppm
Gas

Acrylonitrile · C₃H₃N

Measuring range0–50 ppm
Resolution0 ppm
Measuring range0–2,000 ppm
Resolution1 ppm
Gas

Nitrous Oxide · N₂O

Measuring range0–100 ppm
Resolution0 ppm
Gas

Methylamine

Measuring range0–50 ppm
Resolution0 ppm
Gas

Nitrogen · N₂

Measuring range0–100 %Vol
Resolution0 %Vol
Gas

Benzene · C₆H₆

Measuring range0–10 ppm
Resolution0 ppm
Measuring range0–100 ppm
Resolution0 ppm
Measuring range0–2,000 ppm
Resolution1 ppm
Measuring range0–20,000 ppm
Resolution1 ppm
Gas

Toluene · C₇H₈

Measuring range0–10 ppm
Resolution0 ppm
Measuring range0–100 ppm
Resolution0 ppm
Measuring range0–2,000 ppm
Resolution0 ppm
Measuring range0–20,000 ppm
Resolution1 ppm
Gas

Xylene · C₈H₁₀

Measuring range0–10 ppm
Resolution0 ppm
Measuring range0–100 ppm
Resolution0 ppm
Measuring range0–2,000 ppm
Resolution0 ppm
Measuring range0–20,000 ppm
Resolution1 ppm
Gas

Styrene · C₈H₈

Measuring range0–200 ppm
Resolution0 ppm
Measuring range0–5,000 ppm
Resolution1 ppm
Gas

Vinyl Chloride · C₂H₃Cl

Measuring range0–100 ppm
Resolution0 ppm
Gas

Trichloroethylene · C₂HCl₃

Measuring range0–100 ppm
Resolution0 ppm
Gas

Tetrachloroethylene (PID) · C₂Cl₄

Measuring range0–100 ppm
Resolution0 ppm
Gas

Methyl Bromide · CH₃Br

Measuring range0–200 g/m3
Resolution0 g/m3
Measuring range0–100 ppm
Resolution0 ppm
Measuring range0–30,000 ppm
Resolution1 ppm
Gas

Helium · He

Measuring range0–100 %Vol
Resolution0 %Vol
Gas

Argon · Ar

Measuring range0–100 %Vol
Resolution0 %Vol
Gas

Xenon · Xe

Measuring range0–100 %Vol
Resolution0 %Vol
Gas

Ozone in Water

Measuring range0–20 mg/L
Resolution0 mg/L
Gas

Nitrogen Trifluoride · NF₃

Measuring range0–100 ppm
Resolution0 ppm
Gas

Hydrogen Peroxide · H₂O₂

Measuring range0–100 ppm
Resolution0 ppm
Gas

Sulfuryl Fluoride · SO₂F₂

Measuring range0–100 ppm
Resolution0 ppm
Measuring range0–5,000 ppm
Resolution1 ppm
Measuring range0–10,000 ppm
Resolution1 ppm
Gas

Acetaldehyde

Measuring range0–10 ppm
Resolution0 ppm
Gas

Total Volatile Organic Compounds · TVOC

Measuring range0–10 ppm
Resolution0 ppm
Measuring range0–10 ppm
Resolution0 ppm
Measuring range0–100 ppm
Resolution0 ppm
Measuring range0–2,000 ppm
Resolution0 ppm
Measuring range0–200,000 ppm
Resolution1 ppm
Gas

Iodine · I₂

Measuring range0–50 ppm
Resolution0 ppm

Communication and product capabilities

Included as standard

Confirmed product-wide interfaces and functions
  • USB-C

    Fast charging and data communication.

  • Data logging
  • SOS emergency call
  • Man-down alert

Options for technical review

Select requirements for technical confirmation
0 selectedSelections are added to your enquiry and require configuration confirmation.
  • 4GOptional
  • Wi-FiOptional
  • LoRaOptional
  • MESHOptional
  • BluetoothOptional
  • GPSOptional
  • BeiDouOptional

Certificates & documents

Preview of Environmental Labeling (Type II) Product Verification Certificate ZII26080321001
Certificate

Environmental Labeling (Type II) Product Verification Certificate ZII26080321001

ZII26080321001

View document
Preview of explosion-proof Certificate of Conformity CCRI 26.2596X for BTYQ-MS104K-S2
Certificate

Explosion-proof Certificate of Conformity

CCRI 26.2596X

View document
Preview of TN 754042 7.4 V 1750 mAh battery air transport report PEKSZ202609162103LYY520001
Test report

TN 754042 7.4 V 1750 mAh battery air transport report PEKSZ202609162103LYY520001

Check the document for applicable models and configurations.

View document
Preview of Chinese IP68 test report PTC26080512701R-CN01 for BTYQ-MS104K-S2
Test report

IP68 Test Report — Chinese

Check the document for applicable models and configurations.

View document
Preview of English IP68 test report PTC26080512701R-EN01 for BTYQ-MS104K-S2
Test report

IP68 Test Report — English

Check the document for applicable models and configurations.

View document
Preview of explosion-proof conformity test report 2026550301 for BTYQ-MS104K-S2
Test report

Explosion-proof Conformity Test Report

Check the document for applicable models and configurations.

View document
Preview of Chinese design patent certificate ZL 2025 3 0692599.9 for the MS104K-S2 gas detector
Patent

MS104K-S2 Design Patent Certificate

Check the document for applicable models and configurations.

View document

Downloads

datasheetBTYQ-MS104K-S2 English technical summary
Open PDF

Industries and applications

Safety engineer checking a portable gas detector at an oil and gas process facilityIndustry

Oil & Gas

Oil and gas projects span mobile worker protection, continuous release-point detection and conditioned process sampling. Define the target gases, operating conditions and site response before selecting portable, fixed or online equipment.

Explore operating context
Illustrative personal gas monitoring scene with an Eranntex BTYQ-MS104K-S2 detector worn on a technician's upper chest.Application

Personal Gas Monitoring

Portable gas detectors monitor selected gases and provide local alarms for workers in industrial environments. Match the gas configuration, measuring ranges and sampling method to the task and site conditions.

Review the monitoring task
Field team using remote gas sampling equipment outside a vessel access openingApplication

Confined Space Entry

Define two separate monitoring tasks: remote atmospheric testing before entry and continued monitoring while people are inside. Select gases from the site hazard assessment, then confirm sampling points, the pump, probe and line arrangement, instrument response and the equipment details needed for the inquiry.

Review the monitoring task

Product questions

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BTYQ-MS104K-S2

Front view of the Eranntex BTYQ-MS104K-S2 portable single- or two-gas detector with a color display.

Select the required gases and measuring ranges, and review the listed communication options. Technical sales will confirm compatibility and the final configuration with you.

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Choose up to 2 gases for this product. for other requirements.

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