MIL-G-18997D, MILITARY SPECIFICATION: GAUGE, PRESSURE, DIAL INDICATING (08-OCT-1987) [SUPERSEDING MIL-I-18997C]

MIL-G-18997D, MILITARY SPECIFICATION: GAUGE, PRESSURE, DIAL INDICATING (08-OCT-1987) [SUPERSEDING MIL-I-18997C]., This specification covers environmentally hardened pressure gauges that utilize a mechanical elastic element to sense the pressure to provide an analog indication of the pressure on a circular dial or vertical scale, Helical Edgeview Mechanical Pressure Indicator (HEMPI). Depending on case size and design, the pressure gauge may either be stem or flush/surface mounted.