Deltabar S
Endress+Hauser 11
Dynamic behavior
current output
Dead time, Time constant (T63)
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Presentation of the dead time and the time constant
Dynamic behavior HART Dead time, Time constant (T63)
A typical parametrization for the PLC of 3 to 4 values per second results in the following total dead time:
Reading cycle
• HART commands: on average 3 to 4 per second on average.
The Deltabar S commands the BURST MODE function for cyclic value transmission via the HART
communication protocol.
Response time
250 ms
Cycle time (Update time)
On average 250...330 ms.
Type Dead time t
1
Time constant (T63), t
2
PMD75 45 ms • 10 mbar and 30 mbar measuring cell: 200 ms
• 100 mbar measuring cell: 60 ms
• 500 mbar measuring cell: 45 ms
• 3 bar measuring cell: 40 ms
• 16 bar and 40 bar measuring cell: 60 ms
FMD77, FMD78 dependent on the diaphragm seal
PMD70, FMD76 90 ms • 25 mbar measuring cell: 4700 ms
• 100 mbar measuring cell: 280 ms
• 500 mbar measuring cell: 210 ms
• 3 bar measuring cell: 110 ms
Type Dead time t
1
Time constant (T63), t
2
PMD75 295 ms • 10 mbar and 30 mbar measuring cell: 200 ms
• 100 mbar measuring cell: 60 ms
• 500 mbar measuring cell: 45 ms
• 3 bar measuring cell: 40 ms
• 16 bar and 40 bar measuring cell: 60 ms
FMD77, FMD78 dependent on the diaphragm seal
PMD70, FMD76 340 ms • 25 mbar measuring cell: 4700 ms
• 100 mbar measuring cell: 280 ms
• 500 mbar measuring cell: 210 ms
• 3 bar measuring cell: 110 ms
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