Emerson 8800A, Product Manual

Page: 109 / 160

A-7
Reference Data
Gas and Steam—
for Reynolds Numbers over 15,000
NOTE
For
1
/
2
-in. through 4-in. (15 mm through 100 mm) line sizes, as the
Reynolds number decreases below the stated limit to 10000, the
positive limit of the accuracy error band will increase to 2.1% for the
pulse output. Example: +2.1% to –0.65% for liquids.
Repeatability
± 0.1% of actual flow rate
Stability
±0.1% of rate over one year
Process Temperature Effect
Automatic K-factor correction with user-entered process temperature
Table A-5 indicates the percent change in K-factor per 100 °F (50 °C) in
process temperature from reference temperature of 77 °F (25 °C) for
direct pulse, or user-entered process temperature.
Ambient Temperature Effect
Digital and Pulse Outputs
No effect
Analog Output
±0.1% of span from –40 to 185 °F (–40 to 85 °C)
Digital and Pulse Output
±1.35% of rate
Analog Output
Same as pulse output plus an additional 0.025% of span
Accuracy limitations for gas and steam:
- for 1 /
2
- and 1-in. (DN 15 and DN 25):
max velocity of 220 ft/s (67.06 m/s)
- for Dual-style meters (all sizes):
max velocity of 100 ft/s (30.5 m/s)
Table A-5. Process Temperature Effect
Material Percent Change in K-Factor per 100 °F (50 °C)
316L @ < 77 °F (25 °C) + 0.23 (+ 0,20)
316L @ > 77 °F (25 °C) - 0.27 (- 0,24)
Hastelloy
®
C @ < 77 °F (25 °C) + 0.22 (+ 0,20)
Hastelloy
®
C @ > 77 °F (25 °C) - 0.22 (- 0,20)