SI-200A

Ex ia Fixed Gas Detector

DESCRIPTION

SI-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.

This diffusion-type explosion-proof detector is suitable for hazardous areas where toxic, oxygen, or combustible gases may be present. It features a large LCD for real-time gas concentration display and self-diagnostics. The device supports 4–20mA analog output (HART optional), RS-485 digital communication, and enables convenient configuration and calibration via wireless connection.

KEY FEATURES

- Explosion-proof Structure (Transmitter): Ensures safety in hazardous areas.
- Intrinsically Safe Sensor Housing: Certified Ex ia structure for high-risk environments.
- Optimized for Adsorptive Toxic Gases: Fast and accurate detection of HCl, NH₃, Cl₂, and similar gases.
- 4-digit Gas Concentration Display: Provides real-time readings on a large LCD screen.
- Self-diagnostic Function via LCD: Enables early detection of sensor or system faults.
- 4–20mA Output (HART Optional) / RS-485 Communication: Supports both analog and digital data transmission.
- Wireless Communication Supported: Allows remote configuration and calibration.
- Suitable for Hazardous Area Installation: Designed for industrial environments with explosion risks.

Product Specifications

Model	SI-200A
Dimensions	169mm (W) × 188.5mm (D) × 107mm (H)
Weight	2.4kg
Operation Power	DC: +24Vdc ±10%
Power Consumption	3.6W @ +24VDC
Operation Mode Display	FND, Concentration of Gas, Alarm, Malfunction
Relay	1st Alarm, 2nd Alarm, Fault Alarm (Rated 2.0A @30Vdc)
Analog Output Signal	4–20mA
Digital Output Signal	RS-485
Measuring Method	Diffusion
Operating Temperature	-40℃ to +60℃
IP	IP66
Input and Setting	4 Buttons & RS-485 & Bluetooth
Device Warranty	2 years
Sensor Warranty	1 year
Wireless Interface	RS-485 Modbus, HART (Option)
Certification	KCs: Ex db ia IIC T4 Gb IECEx: Ex ia IIC T4 Gb

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