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SD62
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Figure 2 Installation Dimensions with Rectangular Rotameter
Figure 3 Application Example
The requirements for a quality instrument air supply can be found in the Instrument Society of America's "Quality
Standard for Instrument Air" (ISA-S7.3). Basically, this standard calls for the following:
Particle Size — Maximum particle size in the air stream at the instrument should be no larger than 3 microns.
Dew Point — The dew point, at line pressure, should be at least 10°C (18°F) below the minimum temperature to
which any part of the instrument air system is exposed at any season of the year. Under no circumstances should the
dew point, at line pressure, exceed 2°C (35.6°F).
Oil Content — Maximum total oil or hydrocarbon content, exclusive of non-condensable, should not exceed 1 ppm
under normal operating conditions.
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Rectangular rotameter discontinued; superseded by rounded rotameter shown in Figure 1 and on Page 1
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