8
Section 1
Model 764 Differential Pressure Transmitter
DBE Environment ........................... Two 10-second temperature ramps to 486
º
F maxi
-
mum; 24 hour duration chemical spray exposure;
15 day total exposure to saturated steam at 250
º
F
minimum
Long Term Severe Environment ..... 85 days at 200
º
F and 95% RH
Seismic Qualifications
....................
OBE @ 9.0 G (series of 5)
SSE @ 12.5 G
5% critical damping
no resonance in frequencies below 75 Hz
Mechanical Aging ...........................
500,000 pressure cycles during accelerated aging;
Cycled electrically to induce stress during acceler-
ated aging;
Vibration cycling using 0.2 G sweeps over the 1-100
Hz range @ 1.0 octave/min.
Storage:
Storage per ANSI N45.2.2-1978 Level B @ 70ºF (20ºC) ±20ºF (±11ºC) in
factory-sealed package for 2.5 years maximum will not affect installed service
life.
