LASK CONNECTION 





Fig, 9-11 Oxygen flasks and control/monitoring devices aboard PC- /4, 



sure in the flask (0-4,000 psig), a valve to 

 reduce the pressure as it comes out of the 

 flask (0-100 psi) and a flow meter (0-15 1pm) 

 to indicate and control the rate of oxygen 

 released to the cabin. 



A second arrangement is shown in Figure 

 9.12. In this Scott device the oxygen is intro- 

 duced at one of the fittings at the top and 

 circulates through the system, during which 

 time flask pressure is measured (0-2,000 psi). 

 Flow rate is controlled and monitored (SCFH 

 at 10 psig and 70°F), and oxygen is fed into 

 the cabin via the companion top fitting or 



routed through piping elsewhere if desired. 

 Quite frequently the readout portion of such 

 systems is incorporated into the monitoring 

 panel which is in easy view of the operator 

 and does not require his moving about to 

 check the gages. 



Several portable devices are available to 

 monitor the oxygen content in the atmos- 

 phere. Invariably these are polarographic 

 sensors which indicate by means of a voltme- 

 ter. 



Both the JOHNSON SEA LINK and SDL-J 

 use the Biomarine oxygen monitoring sys- 



432 



