Gas Detection > Fixed Gas & Flame Detection > Senko SI-301 Fixed Sensor Transmitter with Inbuilt Sampling Pump

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SI-301 is an explosion-proof sampling type gas detector that remotely draws and measures sample gas in real time through sensor cartridge inside the device. Designed to help prevent or manage various gas-related incidents such as asphyxiation, poisoning, fire and explosion, or corrosion in hazardous areas across diverse industrial environments.

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Senko SI-301 Fixed Sensor Transmitter with Inbuilt Sampling Pump

The SI‑301 delivers a robust, explosion-proof sampling type gas detector with real-time digital readings, modular sensor maintenance, and multi-interface connectivity—making it a dependable safety solution in high-risk, industrial settings.

Operating Manual:

Ideal Use Cases:

Hazardous industrial zones requiring explosion-proof gas detection
Remote or hard-to-access locations, via sampling tube up to 30 m away
Applications needing real-time alerts and system integration (SCADA, BMS, alarms)
Environments where quick sensor changes minimize downtime
Locations needing clear digital readouts and reliable data logging

Features:

Explosion‑proof (flame‑proof) housing: Certified to Ex d IIC T6 with IP65 rating, designed for safe operation in hazardous or explosive environments
Cartridge‑type sensor module: Enables quick, hassle‑free sensor swaps and maintenance with minimal downtime
Built‑in flow control & sampling system: Internally regulates gas sample flow (100–1,000 ml/min, typically 300–500 ml/min), ensuring precise, repeatable readings
Real‑time digital display: Large LCD/FND shows both gas concentration and flow rate clearly, for immediate visual monitoring
Versatile outputs & multiple communication interfaces: Supports analog (4–20 mA), digital (RS‑485 Modbus), relay alarms (low/high/fault), and optional Ethernet or Bluetooth for configuration

Benefits:

Enhanced safety in hazardous locations: Explosion‑proof design and real‑time monitoring help prevent incidents like asphyxiation, poisoning, fires, or explosions
Excellent uptime & ease of maintenance: Cartridge sensors and modular design simplify servicing, reducing operational disruption
Reliable and accurate sampling: Controlled flow ensures consistency and accurate detection even from up to 30 m away via sampling tubing
Flexible integration and alerting: Comprehensive output options plus internal relay control allow seamless integration into SCADA, BMS, or other monitoring systems .
Wide industrial applicability: Suitable for semiconductor fabs, sewage treatment, mining, petrochemicals, steel plants, and power generation due to explosion-proof certification and universal gas monitoring capability

Specification:

Spec	Value
Dimensions	194 × 152.4 × 136 mm
Weight	4 kg
Flow Rate	100–1,000 ml/min (typ. 300–500)
Power	DC 24 V ±10% or PoE 36–57 V (~48 V)
Power Draw	~5 W
Sampling Distance	Up to 30 m input/output tubing
Certifications	Ex d IIC T6 Gb (ATEX/KC)
Interface	4 buttons, RS‑485, Ethernet, Bluetooth
Warranty	2 years (device), 1 year (sensor)

Sensor Specifications

Gas	Sensor	Range	A1	A2	Resolution
Oxygen (O₂)	Electrochemical	0~30%Vol	19.0%Vol	23.0%Vol	0.1%Vol
Carbon Monoxide (CO)	Electrochemical	0~500ppm	30ppm	60ppm	1ppm
Sulfur Dioxide (SO₂)	Electrochemical	0~20ppm	2ppm	5ppm	0.1ppm
Hydrogen (H₂)	Catalytic	0~100%LEL	15%LEL	50%LEL	1%LEL
Hydrogen (H₂)	Electrochemical	0~1000ppm	100ppm	500ppm	within 5ppm
Hydrogen Sulfide (H₂S)	Electrochemical	0~100ppm	10ppm	15ppm	1ppm
Combustible (-)	Catalytic	0~100%LEL	15%LEL	50%LEL	1%LEL
Combustible (-)	IR	0~100%LEL	15%LEL	50%LEL	1%LEL
Ammonia (NH₃)	Electrochemical	0~100ppm	25ppm	35ppm	1ppm
Acetylene (C₂H₂)	Catalytic	0~100%LEL	15%LEL	50%LEL	1%LEL
Ethanol (C₂H₆O)	Catalytic	0~100%LEL	15%LEL	50%LEL	1%LEL
Toluene (C₇H₈)	IR	0~100%LEL	15%LEL	50%LEL	1%LEL
Toluene (C₇H₈)	Catalytic	0~100%LEL	15%LEL	50%LEL	1%LEL
Methane (CH₄)	IR	0~100%LEL	15%LEL	50%LEL	1%LEL
Methane (CH₄)	Catalytic	0~100%LEL	15%LEL	50%LEL	1%LEL
Chlorine (Cl₂)	Electrochemical	0~5ppm	0.5ppm	1.0ppm	0.1ppm
Chlorine (Cl₂)	Electrochemical	0~20ppm	1ppm	5ppm	0.1ppm
Carbon Dioxide (CO₂)	IR	0~2000ppm	1000ppm	1500ppm	3ppm
Carbon Dioxide (CO₂)	IR	0~5000ppm	3010ppm	5000ppm	8ppm
Carbon Dioxide (CO₂)	IR	0~5%Vol	0.5%Vol	3%Vol	0.1%Vol
Hydrogen Chloride (HCl)	Electrochemical	0~10ppm	1ppm	2ppm	0.1ppm
VOC (VOC)	PID	0~100ppm	50ppm	100ppm	within 3ppm
Xylene (C₈H₁₀)	IR	0~100%LEL	15%LEL	50%LEL	1%LEL
Hydrogen Peroxide (H₂O₂)	Electrochemical	0~10ppm	1ppm	2ppm	0.1ppm
Nitrogen Dioxide (NO₂)	Electrochemical	0~20ppm	3ppm	5ppm	0.1ppm
Ethylene Oxide (C₂H₄O)	Electrochemical	0~30ppm	3ppm	5ppm	0.1ppm
Ethylene (C₂H₄)	Catalytic	0~100%LEL	15%LEL	50%LEL	1%LEL
Nitrogen Monoxide (NO)	Electrochemical	0~100ppm	25ppm	50ppm	1ppm
Hydrogen Fluoride (HF)	Electrochemical	0~5ppm	0.5ppm	1ppm	0.1ppm