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20L Spherical Explosion Tester

ECD-20AE

The ECD-20AE is a professional instrument for determining the maximum explosion pressure maximum rate of explosion pressure rise, and explosion index of dust clouds under specific test conditions. Suitable for assessing dust explosivity in production sites of aluminum powder, zinc powder, plastic powders, and organic synthetic pharmaceutical intermediates, it accurately measures parameters like maximum explosion pressure, maximum rate of explosion pressure rise, explosion index, lower explosion limit, and limiting oxygen concentration.

Test Parameters

Maximum Explosive Pressure, Maximum Explosive Pressure Rate of Rise, Explosive Index

Applicable Fields

Combustible Dust

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Features

Specifications

Standards

Applications

Videos

Features

Capable of testing the explosion parameters of dusts, gases, and hybrid solid/gas systems.

Features built-in international standard test methods. Tests can be executed using standard or user-defined parameters.

Equipped with both chemical and electrostatic ignition to suit different testing purposes.

Explosion vessel with a water-circulating jacket to maintain a constant test environment temperature.

The system automatically performs purging, evacuation, and gas mixture preparation after the target concentration value is entered.

Dust dispersing device capable of completely and uniformly dispersing the dust into the explosion vessel.

Experiments are performed automatically without human intervention.

Real-time display of time and pressure data for an intuitive view of the testing process.

Test results include time-pressure curves, providing detailed explosion information.

Remote operation capability ensures the safety of personnel.

Computer-controlled operation with powerful data analysis capabilities for accurate interpretation of curve characteristics.

Standard: ASTM E1226, ASTM E1515, EN 14034-1, EN 14034-2, EN 14034-3, EN 14034-4, GB/T 16425, GB/T 16426, GB/T 803, ISO/IEC 6184/1, ISO/IEC 6184/2, ISO/IEC 80079-20-2

Specifications

Operating environment	5–45 °C, <85% RH
Explosion vessel	20 L sphere with jacket
Vessel pressure rating	Design pressure 3.0 MPa @ 25 °C
Sphere material	316 stainless steel
Sphere operating temperature	Max. 220 °C
Sphere volume	20 L
Jacket volume	1.5 L
Diffusion pressure sensor	Range 0–3.5 MPa, overload 10.5 MPa; accuracy ±0.1% FS; operating temperature −40 to 105 °C
Gas mixing pressure sensor	Range 0–200 kPa, overload 600 kPa; accuracy ±0.1% FS; operating temperature −40 to 105 °C
Explosion pressure measurement	Range 0–10.0 MPa; resolution 0.001 MPa; accuracy ±0.5% FS; response time <20 µs
Explosion pressure channels	2
Explosion temperature sensor	Range 0–1000 °C; resolution 0.01 °C
Dust dispersion vessel	Volume 0.6 L; pressure rating 2.5 MPa
Dust injection pressure	2.0 MPa
Nozzle type	Rebound nozzle
Dust dispersion delay	30–50 ms
Ignition methods	Chemical ignition (customer-supplied); electrostatic ignition 15 kV, 0.5 s
Ignition delay	60 ms
Explosion pressure data acquisition	Max. sampling rate 100 ks/s; recording time 1 s
Ignition control	Supports remote wireless ignition
Automatic gas mixing	2 gas inlets + 1 air inlet; partial-pressure mixing method; independent pressure sensors and solenoid valves; mixing accuracy ±0.1%
Vacuum system	Rotary vane vacuum pump with dual-layer impact-resistant filters to prevent blockage and contamination; easy replacement
Clamp ring diameter	95 mm
Cleaning port diameter	150 mm
Observation window	Armored glass, 40 mm diameter
Interface	RJ45
Power supply	90–260 VAC / 47–63 Hz
Power	600 W
Dimensions	700 mm × 540 mm × 1210 mm

Applications

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Videos

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Q&A

What types of systems can ECD-20AE test: dust, gas, or hybrid?

It supports explosion parameter testing for dust clouds, flammable gases, and solid–gas hybrid mixtures.

How is the test temperature controlled in the 20 L sphere?

The 20 L explosion vessel includes a water-circulation jacket to maintain stable test temperature, with a maximum vessel operating temperature of 220°C.

Two ignition methods are supported: chemical ignition (customer-supplied) and electrostatic ignition (15 kV, 0.5 s).

How are gas mixtures prepared and how accurate is the concentration control?

The system uses the partial-pressure method with independent pressure sensors and solenoid valves, providing gas-mixing accuracy of ±0.1%.

What does the pressure measurement setup look like for explosion tests?

Explosion pressure is measured over 0–10.0 MPa with 0.001 MPa resolution and <20 µs response time, using two pressure measurement channels, with high-speed data acquisition up to 100 ks/s (1 s record length).

ASTM E1226: Standard Test Method for Explosibility of Dust Clouds

ASTM E1515: Standard Test Method for Minimum Explosible Concentration of Combustible Dusts

EN 14034-1: Determination of explosion characteristics of dust clouds — Part 1: Determination of the maximum explosion pressure p_max of dust clouds

EN 14034-2: Determination of explosion characteristics of dust clouds — Part 2: Determination of the maximum rate of explosion pressure rise (dp/dt)_max of dust clouds

EN 14034-3: Determination of explosion characteristics of dust clouds — Part 3: Determination of the lower explosion limit LEL of dust clouds

EN 14034-4: Determination of explosion characteristics of dust clouds — Part 4: Determination of the limiting oxygen concentration LOC of dust clouds

ISO 6184/1: Explosion protection systems — Part 1: Determination of explosion indices of combustible dusts in air

ISO 6184/2: Explosion protection systems — Part 2: Determination of explosion indices of combustible gases in air

ISO/IEC 80079-20-2: Explosive atmospheres — Part 20-2: Material characteristics — Combustible dusts test methods

Complies with the above standards and their equivalent national or industry standards.

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