Is the Lower Explosive Limit (LEL) the same as the alarm setpoint?

No. LEL is the minimum concentration at which a gas can ignite; for methane it is about 5% by volume, which equals 100% LEL on the detector scale. Alarm setpoints are set well below it, typically at or below 25% LEL for the first-level alarm, according to the local code that governs the project.

Where should a household combustible gas detector be installed?

Mount according to gas density: for natural gas (methane, lighter than air) install high, close to the ceiling; for LPG (heavier than air) install low, close to the floor. Keep the detector within a few metres of the appliance and away from extractor hoods, steam and direct airflow.

Why do oxygen detectors use %VOL instead of ppm?

Normal air contains about 20.9% oxygen by volume, so oxygen deficiency and enrichment are tracked as volume percentages. Common reference alarm points are 19.5% VOL for deficiency and 23.5% VOL for enrichment, which are far easier to read and configure in %VOL than in hundreds of thousands of ppm.

Can a Shield gas detector shut off the gas supply automatically?

Yes. Shield household detectors drive a solenoid valve when the alarm setpoint is reached, and the JYFJS-011 emergency shut-off valve can be triggered by gas alarm systems, fire-protection panels or smart terminals. The valve must be reopened manually so gas cannot return before the hazard is cleared.

What is the difference between a stand-alone and a bus-type point gas detector?

A stand-alone detector such as the SD2130 series alarms locally and drives linkage outputs without a controller, ideal for single zones. Bus or branch-line detectors such as the SD2100A series report to a gas alarm controller (SD8001A/B) installed in a non-hazardous control room for centralized multi-point monitoring.

Does Shield offer OEM and ODM gas detectors?

Yes. With 80+ marketable product models and in-house R&D, Shield supports private labelling, housing and packaging customization and configuration changes for distributors and brand owners. Request the catalog to review available platforms.

High-Quality Portable Gas Detector Shield SD3001 Series Supplier, Factory

1 / 2

High-Quality Portable Gas Detector Shield SD3001 Series Supplier, Factory

Product Overview

The SD3001 portable gas detector (hereinafter referred to as the detector) adopts advanced large-scale integrated circuit technology, international standard intelligent design technology, and proprietary digital-analog hybrid communication technology to create a fully intelligent gas detector. The detector uses natural diffusion to detect gases, with high-quality gas sensors as the sensitive components, offering excellent sensitivity and outstanding repeatability. It is easy to use and maintain, greatly meeting the reliability requirements of industrial site safety monitoring equipment. The shell is made of high-strength engineering plastic, which has high strength, a good feel, and is waterproof, dustproof, and explosion-proof.

Application

This detector is widely used in industries such as petroleum, chemical, environmental protection, metallurgy, refining, gas distribution, biochemical medicine, and agriculture.

Send Inquiry

Product Description

Structure and Function Overview

Serial Number	Area Name
1, 2, 3	Alarm indicator light window
4	Left click
5	Middle button
6	Right-click
7	Gas sensing hole
8	Charging port
9	LCD screen

Structure of the Detector

The main components are the shell, circuit board, battery, display screen, sensor, and charger.

Working Principle

Electrochemical type and catalytic combustion type.

Technical Parameters

The standard gas detection range:	EX or CO or H2S or CO2 (for other detectable gases, see the attached table)
Display error (depending on the installed sensor):	EX≤5%FS, CO: ±5umol/mol or ±10%, H2S: ±2umol/mol or ±10%, O2: ±0.7%VOL
Response time:	T90≤30s(EX), T90≤60s(CO), T90≤60s(H2S), T90≤20s(O2)
Display method:	LCD shows real-time data and system status LED, sound, vibration indicator alarm, fault and undervoltage
Working environment:	Temperature -20℃~50℃; Humidity <95% RH (no condensation)
Operating voltage:	DC3.7V (Lithium battery capacity 2000mAh)
Explosion-proof Mark:	Ex ib IIB T3 Gb
Charging time:	6h~8h
Standby time:	Greater than 8 hours
Sensor life:	2 years
Dimensions:	1125645(mm) (including back clip)
Weight:	Approximately 152g

Precautions for Use

Prevent this device from falling from a height or experiencing severe shocks.

When high concentrations of gas are present, the device may not function properly.

Please strictly follow the instructions for operation and use, otherwise it may lead to inaccurate test results or damage to the machine.

This product must not be stored or used in environments containing corrosive gases (such as high concentrations of chlorine gas, etc.), nor should it be used or stored in other harsh environments, including excessively high or low temperatures, high humidity, electromagnetic fields, and strong sunlight.

If there is dirt on the surface of the machine after long-term use, please use a clean soft cloth dipped in water to gently wipe it. Do not use corrosive solvents or hard objects to wipe the surface of the machine, as this may cause scratches or damage.

To ensure detection accuracy, the machine should be calibrated regularly, and the calibration period should not exceed one year.

For any applications or usage issues beyond what is described in this manual, please contact our company for assistance.

Do not disassemble or replace the battery pack, nor charge the battery pack in an explosive gas environment. It is not allowed to use peripheral plug-in devices without explosion-proof certification in explosive gas environments; nor is it allowed to replace sensors.

Storage and Accessories

Storage

The detector should be stored in a ventilated room with an ambient temperature of -10℃ to 55℃ and a relative humidity not exceeding 85%RH. The air should not contain harmful gases or impurities that could corrode the detector.

Accessories and Others

The supporting detection instrument includes one packing box, one portable single gas detector, one charger, one manual, and one warranty card with a certificate of conformity.

Appendix (Custom instruments can be configured to detect gases listed in the table below)

Detecting gas	Normal range	Selectable range	Resolution	Low alarm	High alarm
Oxygen	0~30%VOL	0~30%VOL	0.1 %VOL	19.5	23.5
Methane	0~4%VOL	0~4%VOL	0.01 %VOL	1.00	2.50
Carbon monoxide	0~1000PPM	0~2000/ 5000PPM	1 PPM	50	200
Hydrogen sulfide	0~100PPM	0~50/200/1000PPM	1/0.1PPM	10	20
Flammable gas	0~100%LEL	0~100%LEL	1%LEL	20	50
Ammonia	0~100PPM	050/500/1000PPM	1/0.1PPM	20	50
Hydrogen gas	0~1000PPM	0~40000PPM	1/0.1PPM	200	500
Chlorine gas	0~20PPM	0~100/1 50PPM	1/0.1 PPM	5	10
Hydrogen chloride	0~20PPM	0~20/ 150PPM	1/0.1PPM	5	10
Sulfur dioxide	0~20PPM	0~50/ 100PPM	1/0.1PPM	5	10
Nitric oxide	0~250PPM	0~500/ 1000PPM	1/0.1PPM	20	125
Nitrogen dioxide	0~20PPM	0~50PPM	1/0.1 PPM	5	10
Carbon dioxide	0~5000PPM	0- 5%/10%VOL (Infrared)	1PPM/0.1%VOL	1000/0.2	2000/0.5
Phosphine	0~20PPM	0~20PPM	1PPM	5	10
Hydrogen chloride	0~20PPM	0~20PPM	1PPM	10	25
Epoxy ethane	0~100PPM	0~100PPM	1PPM	20	50
Ethylene oxide	0~100PPM	0~100PPM	1PPM	20	50
Ozone	0~100PPM	0~100PPM	1PPM	20	50
Formaldehyde	0~40PPM	0~50/100PPM	1/0.1PPM	8	20
Benzene	0~1000PPM	0~1000PPM	1PPM	200	500
Toluene	0~1000PPM	0~1000PPM	1PPM	200	500
Xylene	0~1000PPM	0~1000PPM	1PPM	200	500
VOC	0~1000PPM	0~1000PPM	1PPM	200	500
Vinyl chloride	0~250PPM	0~250PPM	1PPM	50	125
Methanol	0~30PPM	0~30PPM	1PPM	6	15
Isobutene	0~90PPM	0~90PPM	1PPM	18	45
Ethanol	0~80PPM	0~80PPM	1PPM	16	40
Arsine	0-10PPM	0-10PPM	0.1PPM/0.01PPM	2	5

Note: The detection range of customized instruments is subject to the actual instruments delivered. For gases not listed, please contact the manufacturer.

Frequently Asked Questions

What are the main working principles of this detector?

The detector operates using electrochemical and catalytic combustion sensor principles depending on the specific gas being detected.

How often should the gas detector be calibrated?

To guarantee detection accuracy, the unit must be calibrated on a regular schedule, and the interval between calibrations must not exceed one year.

Can the unit be charged or disassembled in hazardous areas?

No. You must not disassemble the unit, replace the battery pack, charge the battery pack, or replace sensors in an explosive gas environment.

What is the battery standby and charging duration?

The detector offers a standby operating duration greater than 8 hours, powered by a DC3.7V 2000mAh lithium battery. A full recharge takes between 6 to 8 hours.

What standard accessories come packaged with the device?

The standard package includes one packing box, one portable single gas detector, one charger, one user manual, and one warranty card with a certificate of conformity.

What are the proper environmental storage conditions?

Store the unit in a well-ventilated area with temperatures between -10℃ and 55℃, relative humidity under 85%RH, free from corrosive gases or damaging airborne contaminants.

High-Quality Portable Gas Detector Shield SD3001 Series Supplier, Factory

Product Description

Related Products

High-Quality Portable Gas Detector Shield SD3001 Series Supplier, Factory

ODM 4 in 1 Portable Gas Detector Shield BTYQ-Z4 Series Manufacturers, Supplier

OEM Portable Gas Detector Pen Shield JLY-50A Series Suppliers, Factory

High-Quality Portable Gas leak Detector Shield JLY-CP100 Series Manufacturer, Supplier

High-Quality China SD6200 Series Household Combustible Gas Detector - Reliable Suppliers & Factory Safety Solutions Manufacturer, Factory

ODM Industrial and Commercial Gas Detector SD2100E Series - Reliable China Suppliers and Factory Solutions Manufacturers, Factory

ODM China SD6103K Household Combustible Gas Detector - Reliable Safety Product from Trusted Suppliers and Factory Manufacturer, Manufacturers

High-Quality China SD6200 Series Household Combustible Gas Detector: Reliable Suppliers and Factory Solutions for Safety Monitoring Manufacturer, Factory

High-Quality China JYFJS-011 Aluminum Alloy Electromagnetic Shut-off Valve | Leading Suppliers & Factory for Gas Safety Solutions Manufacturer, Factories

High-Quality Gas Alarm Controller Shield 8001AB Series - Reliable Gas Detection System from China Suppliers and Factory Manufacturer, Factory