The Respiratory Resistance Tester consists of a flow-adjustable air source, a standardized human head model, two inspiratory and expiratory piping systems and a respiratory resistance measurement system. The flow sensor used has a high zero point stability with full range high stability, full range height and excellent repeatability, low power consumption, low pressure loss and fast response time. The micro piezometer sensor is a two-wire system with high accuracy and good stability; it is safe and reliable to use with an explosion-proof design.

Respiratory Resistance Tester is widely used to determine the inspiratory and expiratory resistance of respirators and masks under specified conditions. It is suitable for testing and inspection of common masks, dust masks, medical masks and anti-haze masks by labour protective equipment inspection agencies and mask manufacturers.

Technical features of the NFPA 1972 Respiratory Resistance Tester:

1. High precision digital flow sensor measurement with a very small initial flow rate.

2. Standard head moulds are used and the K-mask sample is sealed and fixed in a leak-proof manner, making testing easy.

3. The instrument is controlled by an intelligent animated colour screen, fully automatic measurement mode, automatic measurement of inspiration and expiration, data statistics printing.

4. Self-cleaning air source filtering device, full silent mode, no need for external air compressor or air pump.

5. Fully automatic measurement mode, no need to manually adjust the flow meter, high data reproducibility.

6. Micro piezometer sensor range, zero point external continuously adjustable, damping adjustable, no mechanical movable parts, high accuracy.

7. High sensitivity of the flow sensor, with a very small initial flow.

8. flow sensor chip using thermal mass flow meter, no temperature pressure compensation, to ensure the high accuracy of the sensor measurement.

9. Multiple sensors are integrated on a single flow sensor chip, making the range ratio of the sensor much higher.

10. The data logger adopts a graphic dot matrix LCD with a resolution of 128 x 64 and a full Chinese interface for easy operation.

11. 4M memory in the data logger for measuring value recording