7
Model 580A Differential Pressure Switch
Section 1
Application Specifications
Model 580A switches were subjected to IEEE 323-1974/344-1975 qualifi
-
cation testing, which found the devices suitable for functional service in a
limited harsh environment. The service conditions associated with the limited
qualifications are:
•
22 year qualified service life
1
normal conditions of 104°F and 0 psig
•
Radiation exposure to 1 x 10
7
Rads (TID)
•
85 days @maximum DBE conditions of 200°F, 10 psig ambient pressure
and ≥ 95% R.H.
•
Seismic qualifications:
–
OBE @ 6.25 Gs (series of 5)
–
SSE @ 12.5 Gs
–
5% critical damping
–
No resonance in frequencies below 33 Hz
•
Mechanical aging included:
– 25,000 pressure cycles during accelerated aging
–
12,500 electrical cycles during accelerated aging
–
Vibration cycling using 0.2 G sinusoidal sweeps over the 1 to 200
Hz range at 1.0 octave/min.
1
Qualified Life: This equipment contains some organic material. The qualified life will be
governed by factors such as environmental temperature, radiation exposure, and activa-
tion energy.
Storage Specifications
Storage per ANSI N45.2.2-1978 Level B at 70°F (21°C) ±20°F (±11°C) in
factory sealed package for 2.5 years maximum will not affect installed service
life.
