Gas Detection > Fixed Gas & Flame Detection > Sensor Transmitters > Senko SI-100 Fixed Gas Sensor Transmitter - Methane

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Fixed gas detector for toxic, combustible gases and oxygen deficiency. Features large LCD display with self-diagnostics, supports 4-20mA and RS-485 output, and offers strong EMI/RFI resistance with durable metal housing.

NZ $1,175.00
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Senko SI-100 Fixed Gas Sensor Transmitter - Methane

The SI-100 is a fixed gas detector designed to continuously monitor the presence of toxic gases, combustible gases, and oxygen in industrial environments. With an explosion-proof structure and a wide range of sensor options, the SI-100 provides stable and reliable gas detection in hazardous areas. It features a large LCD display with white backlight for clear visibility and supports easy operation and calibration using a magnetic bar. The SI-100 provides output via 4-20mA signals and RS-485 communication, ensuring easy integration with control systems.

Operating Manual:

Key Features:

Supports various sensor types
Easy operation using a magnetic bar
Large digital LCD display with blue backlight
Explosion-proof structure
Water and dust proof design
Automatic calibration by simply applying gas
Long-distance signal transmission via 4–20 mA output
Relay contact output signal

Product Specifications:

Model Name	SI-100
Detected Gas	Combustible Gas		Toxic Gas	Oxygen
Detection Principle	Catalytic	IR	Electrochemical Cell	Galvanic
Sensor Life	> 5 years	> 2 years	> 2 years	< 2 years
Response Time	<15 sec / 90% scale	<30 sec / 90% scale		<15 sec / 90% scale
Resolution	1%LEL	1%LEL		0.1%VOL
Detection Type	Diffusion Type
Accuracy	±3% Full Scale
Operating Voltage	18~32Vdc
Power Consumption	2.8W @ 24Vdc
Indicators	FND, Gas Concentration, Alarm, Device Fault
Relay Output	1st Alarm, 2nd Alarm, Fault Alarm (Rated 5.0A @30Vdc)
Analog Output	4~20mA (HART: Optional)
Digital Communication	RS-485
Remote Interface	RS-485 Modbus, HART (Optional)
Input & Setting	Non-Intrusive with Magnetic Wand & RS-485 (Optional)
Wiring	4~20mA / DC / Relay: Max 20 AWG
Operating Temperature	-20℃ ~ +55℃
Operating Humidity	5% ~ 95% RH (Non-condensing)
Conduit Size	3/4” NPT × 2EA
Device Warranty	2 Years
Sensor Warranty	1 Year
Material	Transmitter: Aluminum, Sensor Housing: Stainless Steel (SS316)
Dimensions	150(W) x 165(H) x 110(D) mm
Weight	Approx. 1.9kg
Explosion-proof Cert	IECEx: Ex d IIC T5

Sensor Specifications:

Gas	Sensor	Range	Low Alarm	High Alarm	Resolution
O₂	Electrochemical	0~30%vol	19.0%vol	23.0%vol	0.1%vol
CO	Electrochemical	0~500ppm	30ppm	60ppm	1ppm
SO₂	Electrochemical	0~20ppm	2ppm	5ppm	0.1ppm
H₂	Catalytic	0~100%LEL	15%LEL	50%LEL	1%LEL
H₂	Electrochemical	0~1,000ppm	100ppm	500ppm	5ppm
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
NH₃	Electrochemical	0~100ppm	25ppm	35ppm	1ppm
C₂H₂	Catalytic	0~100%LEL	15%LEL	50%LEL	1%LEL
C₂H₄O	Catalytic	0~100%LEL	15%LEL	50%LEL	1%LEL
C₆H₆	IR	0~100%LEL	15%LEL	50%LEL	1%LEL
C₇H₈	Catalytic	0~100%LEL	15%LEL	50%LEL	1%LEL
CH₄	IR	0~100%LEL	15%LEL	50%LEL	1%LEL
CH₄	Catalytic	0~100%LEL	15%LEL	50%LEL	1%LEL
Cl₂	Electrochemical	0~5ppm	0.5ppm	1.0ppm	0.1ppm
Cl₂	Electrochemical	0~20ppm	0.5ppm	1.0ppm	0.1ppm
CO₂	IR	0~2,000ppm	1,000ppm	1,500ppm	3ppm
CO₂	IR	0~5,000ppm	3,000ppm	5,000ppm	8ppm
CO₂	IR	0~5%vol	0.5%vol	3%vol	0.1%vol
HCl	Electrochemical	0~10ppm	1ppm	2ppm	0.1ppm
VOC	PID	0~1,000ppm	50ppm	100ppm	with in 3ppm
C₈H₁₀	Catalytic	0~100%LEL	15%LEL	50%LEL	1%LEL
H₂O₂	Electrochemical	0~10ppm	1ppm	2ppm	0.1ppm
NO₂	Electrochemical	0~20ppm	3ppm	5ppm	0.1ppm
C₂H₄O	Electrochemical	0~30ppm	1ppm	2ppm	0.1ppm
C₂H₂	Catalytic	0~100%LEL	15%LEL	50%LEL	1%LEL
NO	Electrochemical	0~100ppm	25ppm	50ppm	1ppm
HF	Electrochemical	0~5ppm	0.5ppm	1ppm	0.1ppm