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.

OEM 4 in 1 Portable Gas Detector Shield BTYQ-Z4 Series Manufacturer, Supplier

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OEM 4 in 1 Portable Gas Detector Shield BTYQ-Z4 Series Manufacturer, Supplier

Product Overview

The BTYQ-Z4 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

Structure and Function Comparison Table

The appearance and structure of the equipment are shown in the following diagram:

Control Buttons: The device has four buttons, namely left, menu, power, and right.

Status Indicators: The device has three indicator lights, namely normal, alarm, and fault indicators.

Leak Detector Structure

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

Working Principle

Electrochemical type and catalytic combustion type.

Technical Parameters

Types of gases	Range	Low alarm point	High alarm point	Resolution
EX	(0~100)%LEL	20%LEL	50%LEL	1%LEL
H2S	(0~100)PPM	10PPM	20PPM	1PPM
CO	(0~1000)PPM	50PPM	200PPM	1PPM
O2	(0~30)%VOL	19.5% ABV	23.5% ABV	0.1%VOL
For other gas mixtures, please contact the company.

Indication error	±5%FS (combustible), ±0.7%VOL (oxygen) Absolute error ±5umol/mol or relative error ±10% (carbon monoxide) Absolute error ±2umol/mol or relative error ±10% (hydrogen sulfide)
Response time	T90≤30S (combustible), T90≤20S (oxygen), T90≤60S (hydrogen sulfide, carbon monoxide)
Indication method	LCD displays real-time data and status, LED, voice, and vibration indicate alarms. And battery undervoltage
Working environment	Temperature -20℃~50℃; Humidity <95% RH (no condensation)
Operating voltage	DC 3.7V (Lithium battery capacity 2700mAh)
Explosion-proof Mark	Ex ib IIB T3 Gb
Standby time	10~12 hours under standard conditions
Dimensions	1326946(mm) (including back clip)
Weight	0.28kg

Precautions for Use

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

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

Please strictly follow the instructions for operation and use, otherwise it may result in 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 the accuracy of the detection, this 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.

In explosive gas environments, non-explosion-proof certified peripheral plug-in devices cannot be used, nor can sensors be replaced.

More Details

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

This product comes with one color box, one toolbox, one standard gas hood, one charging cable, one charging head, one instruction manual, one factory test report, one explosion-proof certificate, one certificate of conformity, and one warranty card.

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	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)

Q1: What standard gases can this gas detector measure?

The standard configuration measures Combustible Gas (EX), Hydrogen Sulfide (H2S), Carbon Monoxide (CO), and Oxygen (O2). Custom configurations are available for specific gases listed in the appendix.

Q2: What is the operating and storage environment requirement for the detector?

The detector operates between -20℃ and 50℃ with humidity <95% RH (no condensation). For storage, it should be kept in a ventilated room at -10℃ to 55℃ with relative humidity ≤85% RH free from corrosive gases.

Q3: How does the gas detector alert users during an alarm condition?

The device uses real-time LCD data display combined with LED lights, voice alerts, and vibration to indicate alarms and battery undervoltage.

Q4: How often should this gas detector be calibrated?

To ensure detection accuracy, the machine should be calibrated regularly, with a calibration period not exceeding one year.

Q5: What safety rules must be followed in explosive environments?

In explosive gas environments, do not disassemble, replace, or charge the battery pack. Non-explosion-proof certified peripheral plug-in devices cannot be used, and sensors must not be replaced in such environments.

Q6: What accessories are included with the product package?

The package includes one color box, toolbox, standard gas hood, charging cable, charging head, instruction manual, factory test report, explosion-proof certificate, certificate of conformity, and warranty card.

OEM 4 in 1 Portable Gas Detector Shield BTYQ-Z4 Series Manufacturer, Supplier

Product Description

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