Scope of application:DH117 Breathing Resistance TesterIt is used to measure the inspiratory resistance and expiratory resistance of respirators and masks under specified conditions. It is applicable to the relevant testing and inspection of ordinary masks, dust masks, medical masks and anti-haze masks by national labor protection equipment inspection institutions and mask manufacturers.

Applicable Standards：                        

GB 2626-2006 Respiratory Protective Equipment Self-priming Filter Anti-particulate Respirator 6.5 6.6

GB/T 32610-2016 Technical specification for daily protective masks.

Technical indicators:

1. The instrument consists of an air source that can adjust the flow rate, a human head mold specified in the standard, two cannula systems for inhalation and exhalation, and a respiratory resistance measurement system.;

2.High sensitivity flow sensor with minimal initial flow;

3.The flow sensor chip adopts thermal mass flowmeter without temperature and pressure compensation, which ensures the high precision measurement of the sensor. The measuring range of the flowmeter is0 L/min ~ 100L/min, accuracy of ± 2%;

4.Multiple sensors are integrated on a single flow sensor chip, which greatly improves the range ratio of the sensor;

5.The flow sensor has high zero stability, high stability in the full range, high accuracy and excellent repeatability in the full range, and has the characteristics of low power consumption, low voltage loss and fast response speed.;

6.Data logger with resolution128 × 64 graphic dot matrix LCD, full Chinese interface, easy to operate;

7.The data logger has4M memory for measured value recording;

8.Micro pressure gauge sensor adopts two-wire system, high precision, good stability; using explosion-proof design safe and reliable;

9.The range and zero point of the micro-pressure gauge sensor are continuously adjustable, the damping is adjustable, there is no mechanical movable part, and the maintenance workload is small. Micromanometer range is-1000Pa ~ 1000Pa, accuracy is 1Pa;

10.The whole instrument adopts a special gas path conversion element, which ensures the convenient and quick conversion of the exhalation and inhalation two-way system.;

11.The suction volume of the suction pump shall not be less40L/min~100L/min. ;

12.The ventilation volume is constant (85±1）L/min;

13.Power:AC220V，50Hz;

14.Applicable to the latest national standard requirements, compatible with labor protection masks and daily protective masks standard.