Agilent Technologies PHD-4 User Manual page 33

Tripping of the "protection set-point" may also trigger an active
protection at one or two levels.
PHD-4 Portable Helium Detector User Manual
Backflow Valve
Reverse
ppm
x
Backflow Valve
Position
Valve
Normal
Quartz Heater
Status
ON
DISPLAY
/ 87-900-120-01 (F )
Technical Information
Basic Unit Data and Specification
Backflow Valve
Normal
Valve Valve
Normal
Reverse
OFF
2 sec
ON
2
“LEAK
!”
5
t
81/140