Richard D. Marshall;Christopher G. Hall;Albert F. Zwolinsky
发明人:
Albert F. Zwolinsky,Richard D. Marshall,Christopher G. Hall
申请号：
US13521024
公开号：
US20130319408A1
申请日:
2010.10.27
申请国别(地区):
US
年份:
2013
代理人:
摘要：
A safety breathing apparatus has a sensor for measuring the difference in pressure between two point 1a, 1b in the gas delivered to a head unit 9. The sensor is used to measure the difference in the pressure of the gas supplied through the apparatus between the two points in the gas flow, and the pressure difference is then used to calculate the gas flow rate.
