What gas safety products does Shield manufacture?

Shield designs and manufactures household combustible gas detectors, industrial and commercial point-type combustible gas detectors, gas alarm controllers, portable and 4-in-1 multi-gas detectors, and solenoid gas shut-off valves. The portfolio covers more than 80 marketable models that can be combined into complete detect-alarm-shut-off systems.

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

No. The LEL is the lowest gas concentration in air that can ignite. Combustible gas detectors read in %LEL and trigger alarms well below that limit. Alarm set points are commonly configured in the range of about 20-25% LEL for the first alarm and up to about 50% LEL for the second alarm, but the final values must follow the standard that applies in your country and project.

Why do oxygen detectors display %VOL instead of ppm?

Normal air contains about 20.9% oxygen by volume, so oxygen deficiency or enrichment is measured in percentage by volume (%VOL). A ppm scale is designed for trace-level toxic gases and would be impractical for oxygen monitoring during pipe welding or confined-space work.

How does a gas detector work with a solenoid shut-off valve?

When the detector or gas alarm controller registers a concentration above the alarm value, it emits an audible and visual alarm and sends a linkage signal that closes the solenoid gas shut-off valve. Shield shut-off valves such as the JYFJS-011 series require manual reopening, so gas supply is only restored after the cause of the leak has been checked.

Does Shield support OEM and ODM orders for distributors?

Yes. Shield supports OEM and ODM cooperation. Branding, packaging, documentation and project-specific configuration such as target gas, alarm values and linkage outputs are reviewed and confirmed with our engineering team before sampling and mass production.

Which certifications do Shield products hold?

Applicable Shield products have been awarded China's mandatory 3C certification, and the company holds more than 40 patents. For export projects, our sales engineers confirm the test reports and compliance documents required in the destination market before an order is placed.

High-Quality Portable Gas Detector Pen Shield JLY-50A Series Manufacturer, Manufacturers

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High-Quality Portable Gas Detector Pen Shield JLY-50A Series Manufacturer, Manufacturers

Product Overview

The JYL-50A 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 design a fully intelligent gas detector. The detector uses a free diffusion method 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, meeting the reliability requirements of industrial site safety monitoring. The casing is made of high-strength engineering plastic, which is strong, has 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. The design, manufacture, and inspection of this product comply with the following national standards.

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Product Description

Combustible Gas Leak Detector - Alarm & Functions

Leak Detector Structure & Dimensions

Special Functions

Powered by 3V batteries (two AA batteries)
Sensor unit with built-in temperature compensation & calibration coefficients for high precision, good linearity, stability, and fast recovery
LCD displays gas concentration with two-pole alarm color prompts
Simple calibration, automatic verification, zeroing, and automatic compensation programs
Anti-radiation & electromagnetic interference design to minimize false alarms
Buzzer alarm indicating two levels of concentration alarm
LCD battery status indicator for timely battery replacement
Miniaturized, economical, and practical design for convenient operation and maintenance

Structure & Working Principle

Leak Detector Structure

The device mainly consists of components such as the casing, circuit board, battery, display screen, and sensors.

Working Principle

Catalytic combustion type.

Technical Parameters

Parameter	Specification
Measure gas	Flammable EX (calibrated with methane CH4)
Measurement range	0~10000PPM
Preheating time	<1 minute
Response time	≤30 seconds
Indication mode	LCD screen displays power supply, concentration, alarm information and sound alarm
Shell material	ABS
Explosion-proof mark	Exib IIB T3 Gb
Alarm threshold	Underreporting: approx. 2000PPM；High report: Approx. 4000PPM
Sensor lifespan	Five years
Sensor drift	Every half a year；Zero point <2%FS, sensitivity <3%FS
Working environment	-10~55°C; <95%RH
Battery voltage	DC 3V (two replaceable AA batteries)
Equipment size	1622521mm
Standby time	About 2 hours
Equipment weight	About 38 grams

Storage & Accessories

Storage Conditions

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

Standard Accessories

One combustible gas leak detector
Two No. 7 batteries
One instruction manual

Appendix: Detectable Gases Range

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	2.5
Carbon monoxide	0-1000PPM	0-2000/5000PPM	1PPM	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	0-50/500/1000PPM	1/0.1PPM	20	50
Hydrogen gas	0-1000PPM	0-40000PPM	1/0.1PPM	200	500
Chlorine gas	0-20PPM	0-100/150PPM	1/0.1PPM	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
Phosphine	0-20PPM	0-20PPM	1PPM	5	10
Hydrogen cyanide	0-20PPM	0-20PPM	1PPM	10	25
Acetylene	0-100PPM	0-100PPM	1PPM	20	50
Ethylene oxide	0-100PPM	0-100PPM	1PPM	20	50
Ozone	0-100PPM	0-20/100PPM	0.1PPM	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

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 (FAQ)

What type of battery does this gas leak detector require?

The detector is powered by DC 3V using two replaceable AA batteries.

What is the sensor lifespan and response time?

The sensor has a lifespan of five years and features a quick response time of ≤30 seconds.

How does the alarm system alert users of a gas leak?

It uses a dual alert system: the LCD screen provides two-pole color prompts displaying concentration levels, accompanied by a two-level buzzer sound alarm.

What environment conditions are suitable for operation and storage?

The device operates in temperatures from -10°C to 55°C with relative humidity below 95%RH. Storage requires a ventilated room within the same temperature range and humidity under 85%RH.

Can this detector be customized for gases other than Methane?

Yes, custom instruments can be configured to detect a wide variety of gases such as Oxygen, Carbon Monoxide, Hydrogen Sulfide, Ammonia, VOCs, and more as detailed in the appendix.

What is the working principle of this detector?

The leak detector operates using catalytic combustion technology for reliable and linear gas concentration measurement.

High-Quality Portable Gas Detector Pen Shield JLY-50A Series Manufacturer, Manufacturers

Product Description

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