This instrument is designed to measure the inspiratory and expiratory resistance of respirators and masks under specified conditions. It is suitable for national labor protection supplies inspection agencies, mask manufacturers, and quality control inspections of various mask types including ordinary masks, dust masks, medical masks, and anti-fog masks.

• Comprises an adjustable flow rate air source, standard-compliant head mold, dual intubation systems for inhalation/exhalation, and respiratory resistance measurement system
• High sensitivity flow sensor with minimal starting flow requirement
• Thermal mass flow meter chip ensures high-precision measurement without temperature and pressure compensation
• Flow meter range: 0-100 L/min with ±2% accuracy
• Multiple sensors integrated on single chip for enhanced range ratio
• Excellent zero point stability, full-range high stability, superior repeatability, low power consumption, minimal pressure loss, and fast response
• Graphic dot matrix LCD display (128×64 resolution) with full Chinese interface
• 4MB memory capacity for measurement value recording
• Two-wire micro-manometer sensor with high accuracy, stability, and explosion-proof design
• Micro-pressure measurement range: -1000Pa to 1000Pa with 1Pa accuracy
• Special gas path conversion elements for convenient inhalation/exhalation system switching
• Suction pump capacity: ≥40-100 L/min
• Constant ventilation volume: (85 ± 1) L/min
• Power supply: AC220V, 50Hz

• Do not carry by the control box bottom during transportation to avoid crushing
• Wipe electroplated parts with oil to prevent rust and maintain brightness
• Clean machine after testing and regularly lubricate moving parts with butter/engine oil mixture
• Wipe control panels with dry cloth only to prevent moisture damage to electronic components
• Store all fixtures and accessories properly after wiping off anti-rust oil
• Ensure stable foundation and level positioning after transportation
• Verify correct power input specifications (incorrect phase may cause leakage)
• Proper grounding required to prevent leakage hazards and signal interference
• Do not unplug during operation
• Operation and maintenance by qualified personnel only; contact maintenance department for major issues