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7
Model 581A Differential Pressure Switch
Section 1
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cation testing, which found the devices suitable for functional service in a
limited harsh environment. The service conditions associated with the limited
•
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.
•
– 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
governed by factors such as environmental temperature, radiation exposure, and activa-
tion energy.
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.