Smoke Detector Test Tunnel

The GB 4715 Smoke Fire Detector Threshold Test Chamber is a precision testing system designed for conducting threshold verification of point-type smoke fire detectors according to GB 4715-2005 standards. The chamber enables comprehensive testing including threshold, repeatability, orientation, and airflow evaluations. It is suitable for industrial and residential smoke detector testing and production, ensuring full compliance with national alarm performance requirements.

Application

The Smoke Fire Detector Threshold Test Chamber is suitable for:

Threshold verification of point-type smoke fire detectors.

Repeatability, orientation, and airflow testing in laboratory or production environments.

Industrial and residential smoke detector production quality control.

Specific Testing Equipment:

Point-type smoke detectors for home and industrial use

Alarm system components requiring threshold and response validation

Production testing lines for smoke detector quality assurance

Standards

The system conforms to the following national and international standards:

GB 4715-2005 – Technical Requirements and Test Methods for Point-Type Smoke Fire Detectors (China)

ISO 7240-7 – Fire Detection and Alarm Systems, Part 7: Smoke Detectors Using Scattered, Transmitted Light, or Ionization

EN 54-7 – Fire Detection and Fire Alarm Systems, Smoke Detectors

UL 268 – Standard for Smoke Detectors for Fire Protective Signaling Systems

EN54-7 

EN54-29 

EN14604

EN54-5

Parameters

Features

Steel structure chamber with anti-rust spray finish.

Observation glass on the chamber for visual monitoring of smoke distribution.

Independent control box for flexible laboratory layout.

Fan connected with soft couplings to reduce vibration impact on test data.

Equipped with an ion concentration meter to test the response threshold of ionization detectors.

Flash device included to simulate environmental lighting conditions.

Siemens dedicated temperature module for stable and reliable temperature data acquisition.

Imported Omega thermocouple with compensation wiring reduces temperature measurement deviations.

Programmable logic controller (PLC) enables system function control, paired with dedicated data acquisition modules.

Real-time data acquisition ensures stability and reliability.

Electrical components from reputable industry brands, controlled via industrial PC with dedicated software for real-time recording, storage, and visualization of test data.

Accessories

Observation glass

Variable frequency fan assembly

Heating rod modules

Optical density meter

Ion concentration meter

Flash simulation device

Omega K-type thermocouple and compensation wiring

Siemens temperature acquisition module

PLC controller with data acquisition modules

Industrial PC and dedicated software

Test Procedures

Install the smoke fire detector into the test chamber.

Power on the chamber and set the target temperature within 0–55 °C.

Activate the variable frequency fan and adjust airflow to 0.2 m/s.

Initiate the smoke generation process and monitor optical density readings.

Conduct threshold, repeatability, orientation, and airflow tests according to GB 4715-2005 protocols.

Use ion concentration meter to verify ionization detector response, if applicable.

Apply flash simulation to assess detector response under different lighting conditions.

Record all data in real time using the industrial PC and dedicated software for analysis.

Maintenance Information

Inspect heating rods and replace if temperature control is unstable.

Regularly clean or replace optical density meters and ion concentration sensors to maintain accuracy.

Check fan soft coupling connections to prevent vibration-related errors.

Verify thermocouple calibration periodically to reduce measurement deviations.

Ensure PLC, data acquisition modules, and industrial PC function correctly; perform software updates as required.

Clean observation glass to maintain clear visibility during tests.

Conclusion

The GB 4715 Smoke Fire Detector Threshold Test Chamber offers a complete solution for laboratory and production testing of point-type smoke fire detectors. Combining precise temperature control, adjustable airflow, optical and ionization measurement, and real-time data acquisition, the system ensures accurate threshold, repeatability, and orientation testing. Its robust construction, user-friendly operation, and comprehensive functionality meet both national and international fire safety testing standards.

FAQ

What types of tests can be performed in the GB 4715 Smoke Fire Detector Threshold Test Chamber?

The chamber allows threshold, repeatability, orientation, and airflow tests of point-type smoke fire detectors, ensuring full compliance with GB 4715-2005 requirements. Ionization detectors can be tested for response thresholds, and flash devices simulate varying environmental light conditions.

How is airflow controlled in the test chamber?

Airflow is managed using a variable frequency fan capable of 0–275 m³/h and 0.2 m/s airflow. Soft couplings reduce vibration effects on test accuracy. This precise control ensures reliable smoke dispersion and detector response measurements.

How is temperature maintained and monitored?

The chamber temperature is controlled via heating rods and measured with an Omega K-type thermocouple and Siemens dedicated temperature module. Temperature can be precisely adjusted within 0–55 °C, and the system provides real-time data for stable and accurate monitoring.

How is data recorded and analyzed?

An industrial PC with dedicated software, paired with PLC control and data acquisition modules, captures all test data in real time. This setup ensures accurate recording of smoke density, detector response, ion concentration, and temperature for analysis and compliance verification.