Proline Promag W 500
Endress+Hauser 13
External measured values
To increase the accuracy of certain measured variables or to calculate the corrected volume flow, the
automation system can continuously write different measured values to the measuring device:
• Medium temperature to increase the accuracy of the electrical conductivity (e.g. iTEMP)
• Reference density for calculating the corrected volume flow
Various pressure transmitters and temperature measuring devices can be ordered from Endress
+Hauser: see "Accessories" section → 112
It is recommended to read in external measured values to calculate the corrected volume flow.
HART protocol
The measured values are written from the automation system to the measuring device via the HART
protocol. The pressure transmitter must support the following protocol-specific functions:
• HART protocol
• Burst mode
Current input
The measured values are written from the automation system to the measuring device via the
current input → 13.
Digital communication
The measured values can be written from the automation system to the measuring via:
• FOUNDATION Fieldbus
• PROFIBUS DP
• PROFIBUS PA
• Modbus RS485
• EtherNet/IP
• PROFINET
Current input 0/4 to 20 mA
Current input 0/4 to 20 mA (active/passive)
Current span • 4 to 20 mA (active)
• 0/4 to 20 mA (passive)
Resolution 1 µA
Voltage drop Typically: 0.6 to 2 V for 3.6 to 22 mA (passive)
Maximum input voltage ≤ 30 V (passive)
Open-circuit voltage ≤ 28.8 V (active)
Possible input variables • Pressure
• Temperature
• Density
Status input
Maximum input values • DC –3 to 30 V
• If status input is active (ON): R
i
>3 kΩ
Response time Adjustable: 5 to 200 ms
Input signal level • Low signal: DC –3 to +5 V
• High signal: DC 12 to 30 V
Assignable functions • Off
• Reset the individual totalizers separately
• Reset all totalizers
• Flow override
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