One-stop customized gas detection and gas shut-off solutions from Shield
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Sichuan Shield Technology · Chengdu, China

Gas Detector & Solenoid Shut-off Valve Manufacturer for Residential, Commercial and Industrial Gas Safety

Shield designs and builds the complete gas-safety chain in-house — household and point-type combustible gas detectors, portable instruments, gas alarm controllers and emergency shut-off valves. Distributors, gas utilities, EPC contractors and OEM brands in global markets rely on our 80+ product models to detect leaks early and isolate the gas supply before a leak becomes an incident.

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Multi-Gas Readout · DemoSystem Normal
CH₄ · LELAL1 25
0.6%LEL
O₂19.5–23.5
20.9%VOL
COAL1 35
1ppm
H₂SAL1 10
0.1ppm
LEL TREND · 60 SDIFFUSION SAMPLING

Illustrative values showing how a 4-in-1 portable detector reports combustible gas in %LEL, oxygen in %VOL and toxic gases in ppm. Alarm setpoints shown are common reference values; configure them to your local code.

Advanced Gas Detection

Gas Detection & Shut-off Product Portfolio

Five interoperable product lines — detectors, controllers, portable instruments and valves — engineered to work as one system. Hover a card for a technical quick-view, tick “Compare” to shortlist up to three models.

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SD2100EIndustrial and Commercial Gas Detector Shield SD2100E Series
Technical quick-view
Wiring
Intelligent bus or split-wire
Display
Real-time on-site concentration
Setup
Infrared remote parameter setting
Point-Type Detector

Point-Type Gas Detector SD2100E Series (GTYQ / GTQ / GQ)

Detector family for combustible and target gases with controller-side audible-visual alarm when limits are exceeded.

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SD8001A/BGas Alarm Controller Shield 8001AB Series
Technical quick-view
Role
Centralized detection & alarm
Location
Non-hazardous control room
System
Supervises Shield field detectors
Gas Alarm Controller

Gas Alarm Controller SD8001A / SD8001B Series

The control-room brain of a multi-point system, monitoring detectors installed in indoor and outdoor hazardous areas.

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SD6200Household Combustible Gas Detector Shield SD6200 Series
Technical quick-view
Use
Residential kitchens & utility rooms
Alarm
Audible + visual
Linkage
Drives solenoid valve shut-off
Household Detector

Household Combustible Gas Detector SD6200 Series

Continuous indoor monitoring that alarms and closes the gas supply to prevent fire, explosion and asphyxiation.

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SD6101Household Combustible Gas Detectors 6101 Series
Technical quick-view
Use
Homes, villas, rental housing
Alarm
Sound & light at setpoint
Linkage
Automatic valve activation
Household Detector

Household Combustible Gas Detector SD6101 Series

Entry platform for distributors building a residential gas-alarm range, available for OEM branding.

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BTYQ-Z44 in 1 Portable Gas Detector Shield BTYQ-Z4 Series
Technical quick-view
Channels
4 gases (typ. LEL / O₂ / CO / H₂S)
Use
Confined space entry & patrols
Housing
Water-, dust- & explosion-proof design
Portable Detector

4-in-1 Portable Multi-Gas Detector BTYQ-Z4 Series

Personal four-gas monitor for tanks, utility tunnels, sewers and maintenance shutdowns.

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JLY-CP100Portable Gas leak Detector Shield JLY-CP100 Series
Technical quick-view
Sampling
Free diffusion
Housing
High-strength engineering plastic
Use
Pipeline & station leak surveys
Portable Detector

Portable Combustible Gas Leak Detector JLY-CP100

Handheld leak detector with high-repeatability sensing for gas distribution and plant inspection crews.

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JLY-50APortable Gas Detector Pen Shield JLY-50A Series
Technical quick-view
Form
Pen-type pinpoint locator
Sampling
Free diffusion
Use
Joints, valves, meters, regulators
Portable Detector

Pen-Type Portable Gas Detector JLY-50A Series

Pocket-size tool for technicians to pinpoint leaks during installation, commissioning and service calls.

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SD3001Portable Gas Detector Shield SD3001 Series
Technical quick-view
Sampling
Natural diffusion
Housing
Water- & dust-proof plastic shell
Use
Daily field inspection
Portable Detector

Portable Gas Detector SD3001 Series

Easy-to-maintain single-gas instrument for petroleum, chemical, metallurgy and agriculture sites.

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Need a specific target gas, measuring range, output signal or private-label housing? Our engineers configure detectors and valves to your market's codes and installation practice.

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About Shield

Engineering Authority Built on 18+ Years of Gas-Detection R&D

Sichuan Shield Technology Co., Ltd. is a high-tech enterprise integrating R&D, production, sales and service of gas detection and alarm equipment, industrial instrumentation, valves, explosion-proof electrical products, intelligent IoT devices and gas sensors.

Because detector, controller and valve are developed under one roof, signal compatibility, alarm logic and shut-off response are validated as a system — not left to the installer to integrate. Our technology-accumulation model supports more than 80 marketable models and fast, low-risk OEM/ODM derivatives.

  • National High-Tech Enterprise
  • Specialized & Innovative SME
  • New Economy “Double Hundred” Enterprise
  • Mandatory 3C (CCC) Certified Products
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Sichuan Shield Technology gas detector production facility in Chengdu REC ● Factory & R&D Tour
KPI-01
18+

Years of experienceFocused on gas safety

KPI-02
80+

Marketable modelsDetectors, controllers, valves

KPI-03
40+

PatentsSensing, circuitry & structure

KPI-04
5

Integrated product linesOne system, one supplier

Quality Assurance

Workshop quality-assurance system covering sensor incoming inspection, assembly and gas-response verification before shipment.

Factory-Direct Value

In-house R&D and production remove middle layers, giving distributors competitive margins on every program.

Stable Supply Capacity

Mature platforms and controlled component sourcing support repeat orders and utility-scale rollouts.

Responsive Service

OEM/ODM engineering, documentation support and after-sales guidance from the team that designs the product.

Project Cases & System Solutions

Application Scenarios: From Kitchen to Refinery

Tap the glowing sensor nodes to see which Shield model is recommended at each point and how it links into the safety chain.

Household gas safety solution with combustible gas detector and shut-off valve SCN-01
NODE A · DETECTHousehold Detector SD6200

Wall-mounted near the appliance: high for natural gas, low for LPG.

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NODE B · ISOLATEShut-off Valve JYFJS-011

Closes the inlet on alarm; manual reset only.

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Residential Kitchens & Apartments

Most domestic gas incidents start with a loose hose, unlit burner or incomplete combustion. A detector that both alarms and closes the supply removes the reliance on occupants reacting in time.

DetectorSound + LightSolenoid Valve
Household detector range
Underground gas pipe network leak detection project case SCN-02
NODE A · SURVEYLeak Detector JLY-CP100

Route patrols along valve pits and manholes.

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NODE B · PINPOINTPen Detector JLY-50A

Locates the exact joint or fitting that is leaking.

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Underground Pipe Networks

Utility tunnels, valve chambers and buried mains accumulate gas out of sight. Survey-then-pinpoint workflows with diffusion-type portables shorten the time from leak report to repair.

Patrol SurveyPinpointIsolate & Repair
Portable detector range
Municipal gas facility monitoring solution SCN-03
NODE A · FIELDPoint Detector SD2100E

Bus or split-wire detectors at regulator stations and meter rooms.

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NODE B · SUPERVISEController SD8001A/B

Central alarm and fault supervision for the whole site.

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Municipal Gas Facilities

Regulator stations, metering rooms and public buildings need continuous, supervised monitoring with clear fault reporting so maintenance teams know a channel is healthy, not just silent.

SD2100ESD8001 ControllerValve / Fan
Gas alarm controllers
Petrochemical industry gas detection project case SCN-04
NODE A · PROCESS AREAPoint Detector SD2100A

Fixed coverage at pumps, flanges and loading points.

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NODE B · PERSONNEL4-in-1 Detector BTYQ-Z4

Worn during tank entry, maintenance and turnaround work.

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Petrochemical, Refining & Metallurgy

Layered protection: fixed point detectors for area coverage, a controller in the non-hazardous control room, and personal multi-gas monitors for workers entering confined spaces.

Fixed DetectionControl RoomPersonal Monitors
Point-type detectors
Industrial and commercial gas safety solution for restaurants and plants SCN-05
NODE A · DETECTStand-Alone Detector SD2130

Local alarm plus linkage output, no controller required.

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NODE B · ISOLATEShut-off Valve JYFJS-011

Driven directly by the SD2130 linkage output.

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Commercial Kitchens & Industrial Plants

Restaurants, hotels, boiler rooms and workshops need fast, self-contained protection. Stand-alone detectors with direct valve and fan linkage keep installation simple and costs predictable.

SD2130Linkage RelayValve + Exhaust
Solenoid shut-off valves
Supplier of Professional Gas Detection Equipment

Configure the Right Gas-Safety System in Two Steps

Tell us where the risk is and how you want to respond — the selector maps your answer to the Shield product line our engineers would specify first.

Shield flagship gas detection equipment
01High-quality gas sensor
02Audible & visual alarm
03Linkage output
04Rugged sealed housing

Gas-Safety Selector

Step 01 · Where is the gas risk?

Select an application to begin. No personal data required.

Our Partners

Trusted by Gas Utilities, Integrators and Industrial Brands

Shield is fortunate to have supplied and co-developed gas-safety solutions with these organizations.

Global Service Network
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Technical Insights

Gas-Detection Insights & Compliance Guides

Field-tested answers to the questions procurement teams and safety engineers actually ask us — written by the engineers who build the instruments.

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Buyer FAQ

Technical FAQ for Gas-Detection Buyers

Clear answers on setpoints, installation and system design — so your specification is right before the order is placed.

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Q01Is the Lower Explosive Limit (LEL) the same as the alarm setpoint?
No. The LEL is the lowest concentration at which a gas can ignite — for methane about 5% by volume, shown as 100% LEL on the detector. Alarm setpoints sit well below it, typically at or below 25% LEL for the first-level alarm, as required by the code governing your project.
Q02Where should a household combustible gas detector be installed?
Follow gas density. Natural gas (methane) is lighter than air — mount high, near the ceiling. LPG is heavier than air — mount low, near the floor. Keep the detector within a few metres of the appliance and away from hoods, steam and direct drafts.
Q03Why do oxygen detectors read in %VOL instead of ppm?
Normal air contains about 20.9% oxygen by volume. Deficiency and enrichment are therefore tracked as volume percentages, with common reference alarms at 19.5% VOL (deficiency) and 23.5% VOL (enrichment) — far easier to read than six-digit ppm values.
Q04Can a Shield detector shut off the gas supply automatically?
Yes. Household detectors drive a solenoid valve at the alarm setpoint, and the JYFJS-011 emergency shut-off valve accepts signals from gas alarm systems, fire panels and smart terminals. It must be reopened manually, so gas cannot return before the cause is fixed.
Q05Stand-alone or bus-type point detector — which should I specify?
Choose a stand-alone SD2130 for single zones that need local alarm and direct valve or fan linkage. Choose bus/branch-line SD2100A or SD2100E detectors with an SD8001A/B controller in a non-hazardous control room when you need centralized multi-point supervision and fault reporting.
Q06Do you support OEM and ODM programs?
Yes. With 80+ marketable models and in-house R&D, we support private labelling, housing and packaging customization and configuration changes for distributors and brand owners. Request the catalog
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