Gas Detection > Fixed Gas & Flame Detection > Senko SI-200A Fixed Gas Sensor Transmitter

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TSI-200A is an intrinsically safe (Ex ia) fixed gas detector designed for fast and accurate detection of toxic gases such as HCl, NH₃, and Cl₂—gases that often suffer from delayed response due to adsorption in conventional flameproof (Ex d) detectors. With its optimized sensor housing and internal structure, the SI-200A minimizes adsorption effects, ensuring faster response time and higher measurement accuracy.

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Senko SI-200A Fixed Gas Sensor Transmitter

The SI‑200A is a high-performance, intrinsically safe fixed gas detector tailored for adsorption-prone toxic gases like HCl, NH₃, H2S and CL₂. Its optimized housing delivers fast, accurate responses; its rugged design ensures reliability in harsh settings; and versatile output and wireless configuration make it a smart, efficient solution for modern industrial safety needs.

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Ideal Use Cases

Environments with high concentrations of HCl, NH₃, H2S or CL₂
Applications requiring fast, reliable toxic gas detection in classified explosive zones
Remote or outdoor installations needing weatherproof, low-maintenance sensors
Facilities that demand remote calibration to minimize personnel exposure

Features:

Intrinsically Safe Sensor Housing (Ex ia): Designed for maximum safety in hazardous environments, the SI‑200A isolates the sensor module for safe operation even in explosive atmospheres
Optimized Design for Adsorptive, Toxic Gases: Engineered to minimize adsorption delays—specifically with gases like HCl, NH₃, H2S and CL₂—this ensures faster, more accurate detection compared to conventional flameproof units
Large Digital Display & Self-Diagnostics: Features a 4‑digit LCD display presenting real-time gas concentration, along with built-in self-diagnostic alerts for streamlined monitoring
Dual Analog & Digital Outputs: Offers 4–20 mA analog output (with optional HART) plus RS‑485 digital communication—ideal for integration with SCADA, DCS, or building management systems
Wireless Configuration Support: Enables remote device configuration and calibration, reducing the need for on-site manual adjustments

Benefits:

Fast & Accurate Detection of Adsorptive Gases: With optimized sensor housing, the detector excels at identifying HCl, NH₃, CL₂ without the lag typical of adsorption delay—validated by internal testing showing immediate responses to these gases
Robust & Reliable in Harsh Environments: Built with rugged IP66 enclosure and operating down to –40 °C, the SI‑200A is ideal for outdoor, industrial, and chemically aggressive settings
Seamless System Integration: With analog, digital outputs, and optional HART, the device connects effortlessly to industrial control systems for real-time alerting and data logging
Remote Configuration Saves Time: Bluetooth or wireless capabilities enable remote setup and calibration—minimizing downtime and reducing risks associated with field maintenance
Intrinsically Safe for Hazardous Zones: Ex ia-certified sensor design ensures intrinsic safety, making it suitable for Zone 0/1/2 environments where toxic or combustible gases are present

Product Specifications:

Specification	Details
Dimensions	169 × 188.5 × 107 mm
Weight	2.4 kg
Power Supply	24 V DC ±10%, ~3.6 W consumption
Protection Rating	IP66 – protection from dust and water
Textile Display	4‑digit LCD FND
Relay Outputs	Alarm 1, Alarm 2, Fault (2 A @ 30 V DC)
Analog Output	4–20 mA (HART optional)
Digital Output	RS‑485 (Modbus compatible)
Operating Temperature	–40 °C to +60 °C
Certification	KCs Ex db ia IIC T4 Gb, IECEx Ex ia IIC T4 Gb
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 / 0~2,000ppm (Option)	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	0~500ppm	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
Carbon Dioxide (CO₂)	IR	0~2000ppm	1000ppm	1500ppm	3ppm
Carbon Dioxide (CO₂)	IR	0~5000ppm	3000ppm	5000ppm	8ppm
Carbon Dioxide (CO₂)	IR	0~5%Vol	0.5%Vol	3%Vol	0.1%Vol
VOC (VOC)	PID	0~1000ppm	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	1ppm	2ppm	0.1ppm
Ethylene (C₂H₄)	Catalytic	0~100%LEL	15%LEL	50%LEL	1%LEL
Nitrogen Monoxide (NO)	Electrochemical	0~100ppm	25ppm	50ppm	1ppm