Explosion Limits Tester
The HWP21-30SE is designed to determine the upper and lower flammability limits of chemical vapors mixed with air at test temperature and atmospheric pressure. Applicable to gases, vaporizable liquids, and solids, it provides critical technical data for fire hazard classification and process safety specifications. Inert gases may be used as diluents; substances with oxidizing properties stronger than air must not be used.
Test Parameters
Upper and Lower Flammability Limits (UFL and LFL)
Application
Chemicals, Petrochemicals, Energy
Features
Specifications
Applications
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Features
Embedded processor, Windows CE operating system.
8-inch LCD touchscreen displaying real-time test status.
Optional 5 L and 12 L round glass test containers ensuring thorough gas mixing and good compatibility.
Explosion relief devices (relief door and spring clamping device).
Integrated heating and cooling design for compact instrument structure.
Built-in air circulation system ensuring temperature uniformity and stability.
High-precision, high-frequency-response blending pressure sensor with response time ≤2.5 ms. Protection rating IP65.
Combination of pressure sensors and thermocouples detecting sample status; automatic monitoring and recording of ambient temperature, humidity, and atmospheric pressure.
High-precision pressure sensor combined with fast-response solenoid valves and temperature-compensated gas-blending algorithm for precise gas mixture ratio control.
Magnetic stirring with remote start control for automatic ignition and precise ignition timing.
Automatic cleaning of container and combustion products by extracting internal gases.
Equipped with a bottle brush for cleaning substances adhering to container walls using a mixture of fine sand, detergent, and water.
Double-glazed, anti-fog tempered glass observation window and rear pressure relief door for safety and convenient observation.
Dual interlock protection ensuring ignition operations are invalid if the door is not closed or the target temperature is not reached.
Video surveillance system recording the test process; playback for result observation and judgment.
Fully automated test process requiring no manual intervention; supports parameter setting, data storage, and report viewing.
Supports remote control ignition and instrument-side delayed ignition, ensuring operator safety.
Standards: GB/T 21844 -2008, ASTM E681-2009, GAT536, NY/T 1860.25
Specifications
| Operating Environment | -5–45°C, <95% RH |
| Test Objects | Gases, vaporizable liquids, or solids |
| Temperature Control Range | -10–210 °C |
| Temperature Control Accuracy | ±1°C |
| Sample Temperature Measurement Range | -50–350 °C |
| Sample Temperature Measurement Resolution | 0.1°C |
| Sample Temperature Measurement Accuracy | ≤±(0.15 + 0.002|t|)°C |
| Blending Pressure Measurement Range | 0–110 kPa |
| Blending Pressure Measurement Accuracy | ±0.1% FS |
| Oven Ambient Temperature Control Range | -10–210 °C, accuracy ≤±1 °C |
| Ambient Temperature Measurement Range | -10–60 °C |
| Ambient Temperature Measurement Accuracy | ±0.5 °C |
| Ambient Humidity Measurement Range | 5–95% RH |
| Ambient Humidity Measurement Accuracy | ±5.0% RH |
| Ambient Atmospheric Pressure Measurement Range | 60–110 kPa |
| Ambient Atmospheric Pressure Measurement Accuracy | ±0.5 kPa |
| Achievable Working Vacuum | ≤1.33 kPa |
| Leakage Rate | ≤0.03 kPa/min |
| Timing Range | 0–24 h |
| Timing Accuracy | ±0.01 s |
| Igniter Spark Gap | 6.4 mm |
| Igniter Arc Voltage / Current | 15 kV / 30 mA |
| Ignition Duration | 0–1 s |
| 5 L Glass Container Size | Diameter approx. 222 mm, height approx. 345 mm |
| 12 L Glass Container Size | Diameter approx. 295 mm, height approx. 378 mm |
| Stirrer Speed | ≥300 rpm |
| Instrument Dimensions (L × W × H) | 930 mm × 600 mm × 1100 mm (excluding camera) |
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