Endress+Hauser Proline Promass E 500 PROFINET Operating Instructions Manual page 255

Proline Promass E 500 PROFINET
Operable flow range
Input signal
Endress+Hauser
Calculation example for gas
• Sensor: Promass E, DN 50
• Gas: Air with a density of 60.3 kg/m³ (at 20 °C and 50 bar)
• Measuring range (liquid): 70 000 kg/h
• x = 125 kg/m³ (for Promass E, DN 50)
Maximum possible full scale value:
 =  · ρ : x = 70 000 kg/h · 60.3 kg/m³ : 125 kg/m³ = 33 800 kg/h
max(G) max(F) G
Recommended measuring range
Flow limit →  271
Over 1000 : 1.
Flow rates above the preset full scale value do not override the electronics unit, with the
result that the totalizer values are registered correctly.
External measured values
To increase the accuracy of certain measured variables or to calculate the corrected volume
flow for gases, the automation system can continuously write different measured values to
the measuring device:
• Operating pressure to increase accuracy (Endress+Hauser recommends the use of a
pressure measuring device for absolute pressure, e.g. Cerabar M or Cerabar S)
• Medium temperature to increase accuracy (e.g. iTEMP)
• Reference density for calculating the corrected volume flow for gases
Various pressure transmitters and temperature measuring devices can be ordered
from Endress+Hauser: see "Accessories" section →  252
It is recommended to read in external measured values to calculate the corrected volume
flow.
Current input
The measured values are written from the automation system to the measuring device via
the current input →  255.
Digital communication
The measured values are written from the automation system to the measuring device via
PROFINET.
Current input 0/4 to 20 mA
Current input
Current span
Resolution
Voltage drop
Maximum input voltage
Open-circuit voltage
Possible input variables
0/4 to 20 mA (active/passive)
• 4 to 20 mA (active)
• 0/4 to 20 mA (passive)
1 µA
Typically: 0.6 to 2 V for 3.6 to 22 mA (passive)
≤ 30 V (passive)
≤ 28.8 V (active)
• Pressure
• Temperature
• Density
•
Technical data
255