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 Industrial and Commercial Gas Detector Shield SD2100E Series Manufacturers, Factory

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OEM Industrial and Commercial Gas Detector Shield SD2100E Series Manufacturers, Factory

Product Overview

GTYQ-SD2100E/GTQ-SD2100E/GQ-SD2100E series point gas detector (hereinafter referred to as the detector), for intelligent bus system and split-wire products, and supporting the controller to form a gas alarm detection system, real-time detection of target gases that may be present in the operating environment, real-time concentration of the gas is displayed on-site, and the controller sends out an acoustic and visual alarm signal when the concentration exceeds the limit. The normal, fault or alarm status of the detector can be monitored by the controller, and parameters such as zero calibration, concentration calibration, high/low limit alarm values, etc. can also be set for the detector by the controller or infrared remote controller.

Application

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

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Product Description

Product Overview & Key Features

Industrial and Commercial Gas Detector SD2100E

Product Features

Adapted to bus system and 4-20mA split line system, convenient for system design and expansion;
Sensor modules are replaceable, reducing use and maintenance costs;
Infrared remote control for on-site operation without opening the lid;
Digital tube display, real-time display of gas concentration and equipment status;
With its own linkage control output, it can control the sound and light or fan/valve on site;
Double outlet structure for easy on-site construction;
Built-in temperature detection function, to ensure that the product in a variety of temperature environment detection is accurate and effective.

Unboxing and Inspection

Accessories for the whole machine:

Product manual (1 pc)
Factory inspection report (1 pc)
Certificate of conformity (1 pc)
Mounting plate (1 pc)
Mounting fittings (1 pc)

Open the box and check:

Ensure no scratches on the appearance of the product, the label is complete and clear, and all accessories are complete.

Technical Parameters

Detecting gas	Methane / propane / other gases
Detection Principle	Catalytic Combustion / Infrared / Electrochemical / Semiconductor / PID
Sampling method	Diffusion
Measuring range	(3~ 100)%LEL or others
Alarm setpoint (default for combustible gases)	25% LEL low limit / 50% LEL high limit
Alarm error	±3%F.S
Response time	Combustible gas ≤30S(T90) / toxic gas ≤60S(T90)
Power consumption	≤3W (DC24V)
Protection class	IP66
Explosion-proof grade	ExdⅡCT6Gb
Communication mode	S-BUS bus & 4-20mA wiring system
External control output	1 passive switch signal, contact capacity 1A/AC220V or 1A/DC24V
Sensor life	Three years (catalytic typical)
Storage Temperature	-25℃ ~ +55℃
Use environment	Temperature -40℃ ~ +70℃, relative humidity ≤93%RH
Explosion-proof cable introduction interface	Wire outer diameter 9-10mm
Threaded connection size	G3/4
Product weight	About 880g
Product size	156.5mm x 150.5mm x 76.5mm

Structure & Display Component Description

Display Components

Display Status Reference

Display Status	Status Description
—	Equipment self-test
[Blank]	Equipment failure
-E1-	Sensor failure
-E2-	Sensor anomaly

Installation Diagrams & Wiring Instructions

Installation Diagram (Dimensions: mm)

Installation Methods

Ceiling Installation

Wall Mount

Cross-pipe Installation

Vertical Pipe Installation

Mounting Plate

Wiring Terminal Diagram & Description

Safety Instructions for Use

To ensure that you fully understand the characteristics, functions and operating requirements of the product, so as to avoid any unnecessary damage or accidents. Before using the product, please be sure to read and understand the contents of this manual completely, especially the warnings and precautions, and keep this manual appropriately.

Distress & Critical Precautions

Please disconnect the power supply before wiring, removing wires and other work, do not operate with electricity;
Do not place the equipment in explosive, humid, dusty, extremely hot, extremely cold, corrosive gases, strong electromagnetic radiation or unstable lighting conditions and other environments;
It is strictly prohibited to open the cover with electricity.

Operation Warnings

It is strictly prohibited to disassemble and dismantle the equipment and other operations;
Please ensure that the power supply has been disconnected and the equipment is in a stable state before maintaining the equipment;
Prohibit unauthorized maintenance operations, maintenance should contact after-sales support.

General Safety Precautions

Operators are required to take safety precautions to ensure personal safety;
If you have any questions or uncertainties, please read the manual carefully or consult the after-sales support.

Frequently Asked Questions (FAQ)

What gases can the SD2100E Gas Detector monitor?

The SD2100E series is designed to detect Methane, Propane, and various other combustible or toxic gases utilizing Catalytic Combustion, Infrared, Electrochemical, Semiconductor, or PID sensor principles.

What are the explosion-proof and protection ratings of this device?

The detector features an ExdⅡCT6Gb explosion-proof grade and an IP66 protection class rating, ensuring high reliability and safety in harsh industrial environments.

Can the device operate external safety equipment like valves or alarm lights?

Yes. It features built-in passive switch linkage control output (1A/AC220V or 1A/DC24V) to trigger local sound and light alarms, exhaust fans, or shut-off valves automatically.

Is it required to open the device cover for on-site operation or calibration?

No, the detector supports infrared remote control, allowing operators to complete on-site configuration and adjustments conveniently without opening the explosion-proof cover.

What communication methods are compatible with this gas detector?

It supports dual system integration including S-BUS bus systems and standard 4-20mA split line wiring systems, facilitating effortless design and future network expansion.

What installation methods are supported for site mounting?

The SD2100E comes with a mounting plate supporting four versatile installation modes: Ceiling Installation, Wall Mount, Cross-pipe Installation, and Vertical Pipe Installation.

OEM Industrial and Commercial Gas Detector Shield SD2100E Series Manufacturers, Factory

Product Description

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