10 Technical data Proline Prowirl 72 FOUNDATION Fieldbus
66 Endress + Hauser
10.1.5 Power supply
Electrical connection see Page 20 ff.
Supply voltage 9 to 32 V DC
Cable entry Power supply cable/fieldbus cable (outputs):
• Cable entry: M20 1.5 (6 to 12 mm / 0.24 to 0.47 inch)
• Thread for cable entry: ½" NPT, G ½", G ½" Shimada
Cable specifications, remote
version
• Permitted temperature range:
between –40 °C (–40 °F) and the max. permissible ambient temperature plus 10 °C (plus 18 °F)
• Remote versionPage 23
Power supply failure • The totalizer stops at the last value determined.
• All settings are kept in the EEPROM.
• Error messages are stored.
10.1.6 Performance characteristics
Reference operating
conditions
Error limits following ISO/DIN 11631:
• 20 to 30 °C (68 to 86 °F)
• 2 to 4 bar (30 to 60 psi)
• Calibration rig traced to national standards.
• Calibration with the process connection corresponding to the particular standard.
Maximum measured error • Liquid:
<0.75% o.r. for Re > 20 000
<0.75% o.f.s for Re between 4000 and 20 000
• Gas/steam:
<1% o.r. for Re > 20 000 and v < 75 m/s (246 ft/s)
<1% o.f.s for Re between 4000 and 20 000
o.r. = of reading
o.f.s. = of full scale value
Re = Reynolds number
Diameter jump correction
Prowirl 72 can correct shifts in the calibration factor which are caused by a jump in the diameter
between the device flange and the mating pipe. The diameter jump should only be corrected within
the following limit values (for which test measurements have also been performed).
Flange connection:
DN 15 (½"): ±20% of the internal diameter
DN 25 (1"): ±15% of the internal diameter
DN 40 (1½"): ±12% of the internal diameter
DN 50 ( 2"): ±10% of the internal diameter
To Next Page
Loading...
