Ngày đăng: 03/03/2018, 20:52
To 10,000 PSIG (69 MPa)
Design Temperature To 350°F (175°C) for differential-pressure (d/p) cell and to 1200°F (650°C) for filled
systems; others to 200°F (93°C); standard electronics generally limited to 140°F
Range Differential-pressure cells and indicators are available with full-scale ranges as low
as 0 to 5 in. (0 to 12 cm) H2O. The higher ranges are limited only by physical tank
size, since d/p cells are available with ranges over 433 ft H2O (7 MPa or 134 m H2O).
Inaccuracy ±0.5% to 2% of full scale for indicators and switches. For d/p transmitters, the basic
error is from ±0.1% to 0.5% of the actual span. Added to this are the temperature
and pressure effects on the span and zero. In case of “intelligent” transmitters, the
pressure and temperature correction is automatic, and the overall error is ±0.1% to
0.2% of span with analog outputs and may approach ±0.01% with digital outputs.
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