HY-GA40A - Gas detector Dahua Technology - Free user manual and instructions

Product Type	Gas Detector
Brand	Dahua Technology
Model	DHI-HY-GA40A
Gas Type	Methane (CH4)
Alarm Threshold	10% LEL
Response Time	≤30 seconds
Supply Voltage	DC12V
Power Consumption	≤0.8W
Output	1 valve output + 1 relay output
Operating Temperature	-10°C to +55°C (+14°F to +131°F)
Relative Humidity	≤95% RH (non condensing)
Warm-up Period	180 seconds
Alarm Method	Visual and audible alarm
Alarm Sound Output	70dB (A) at 1m (3.28 feet)
Silence Function	Supported
Dimensions	86.6 × 86.6 × 29.2 mm
Installation	Wall mount
Certification	CE
Sensor Type	Catalytic-type gas sensor
Indicator Lights	Three (power, alarm, fault)
Intelligent Linkage	Auto close valve / start fan
Detection	Gas concentration and temperature

Frequently Asked Questions - HY-GA40A Dahua Technology

What type of gas does the Dahua HY-GA40A detect?

The HY-GA40A is designed to detect methane (CH4) gas.

What is the alarm threshold of the gas detector?

The alarm threshold is set at 10% LEL (Lower Explosive Limit).

How do I install the HY-GA40A?

The device is wall mounted. Ensure it is installed at a suitable location away from sources of interference.

What power supply is required?

It requires a DC12V power supply with a maximum power consumption of 0.8W.

Can the gas detector connect to an exhaust fan or gas valve?

Yes, it has a relay output and a valve output to automatically start an exhaust fan or close the gas valve upon alarm.

How long does it take for the device to warm up?

The warm-up period is 180 seconds (3 minutes).

What does the silence function do?

The silence function allows you to temporarily mute the audible alarm while the device continues monitoring.

What are the operating temperature and humidity ranges?

It operates from -10°C to +55°C and up to 95% RH (non condensing).

How do I maintain and clean the gas detector?

Clean the device with a dry soft cloth. Do not use water or solvents. Periodically check the sensor for dust accumulation.

Is the device certified?

Yes, it has CE certification and complies with relevant safety standards.

USER MANUAL HY-GA40A Dahua Technology

System Overview

DHI-HY-GA40A Gas Alarm is designed to continuously monitor methane concentration. Adopting a catalytic-type gas sensor, advanced electrical technology, MCU, a built-in high-volume buzzer, it responds quickly and becomes highly sensitive with stable performance and low false alarm. Once the surrounding methane concentration reaches the alarm threshold, it will promptly send out visual and audible alarm signal to remind the user to take immediate measures. The exhausting fan can be linked to the relay output port to send out combustible gas. The Device can also close the pipeline valve to cut off the gas source.

Functions

Precise detection

A catalytic-type gas sensor is used for precise detection, stable performance and long-term operation. Alarm Threshold is 10% LEL.

Intelligent linkage

After alarm, it can automatically close the valve or turn on the exhausting fan, and address the leakage in time.

Multidimensional detection

It can detect the gas concentration and environment temperature.

Scene

Application scenarios include homes, restaurants, hotels and other places that require methane detection.

• High-performance sensor, intelligent and accurate detection of gas leakage, and send out alarm signal timely
• Operate stably and identify gas type effectively
• Intelligent linkage to close pipeline valve and start exhausting fan
  • A built-in high-volume buzzer, 70dB (A) at 1m (3.28 feet)
• Three indicator lights for displaying device status clearly

Technical Specification

Model DHI-HY-GA40A
Gas Type Methane (CH4)
Alarm Threshold 10% LEL
Response Time ≤30 s
Supply Voltage	DC12V
Power Consumption ≤0.8W
Output 1 valve output, 1 relay output
Operating Temperature -10°C to +55°C (+14°F to +131°F)
Relative Humidity ≤95% RH (non condensing)
Warm-up Period 180 s
Alarm Method Visual and audible alarm
Alarm Sound Output 70dB (A) at 1m (3.28 feet)
Silence	Support
Dimensions	86.6 mm × 86.6 mm × 29.2 mm (3.41" × 3.41" × 1.15")
Installation	Wall mount
Certification	CE

Ordering Information

Type	Part Number	Description
Gas Alarm	DHI-HY-GA40A	Gas Alarm (Methane)

Installation

Dimensions (mm/inch)