Endress+Hauser Proline Prosonic Flow 91 User Manual

Troubleshooting Proline Prosonic Flow 91
54 Endress+Hauser
9.4 Response of outputs to errors
!
Note!
The response of the totalizer, current output, pulse output and status output is defined in the
FAILSAFE MODE function (→ ä 99).
The outputs can be set to their fallback value be means of the postitive zero return. Applicable when
operation has to be interrupted while a pipe is being cleaned. This function takes priority over all
other device functions; simulations, for example, are suppressed.
Failsafe mode of outputs and totalizers
Process/system error is present Positive zero return is activated
Current output MINIMUM VALUE
4–20 mA (25 mA) → 2 mA
4–20 mA NAMUR → 3.5 mA
4–20 mA US → 3.75 mA
4–20 mA (25 mA) HART → 2 mA
4–20 mA HART NAMUR → 3.5 mA
4–20 mA HART US → 3.75 mA
MAXIMUM VALUE
4–20 mA (25 mA) → 25mA
4–20 mA NAMUR → 22.6 mA
4–20 mA US → 22.6 mA
4–20 mA (25 mA) HART → 25 mA
4–20 mA HART NAMUR → 22.6 mA
4–20 mA HART US → 22.6 mA
ACTUAL VALUE
Fault is ignored, i.e. standard measured value output on the basis of ongoing flow
measurement (not recommended).
Output signal corresponds to "zero flow"
Pulse output MINIMUM/MAXIMUM VALUE → FALLBACK VALUE
Signal output → No pulses
ACTUAL VALUE
Fault is ignored, i.e. standard measured value output on the basis of ongoing flow
measurement.
Output signal corresponds to "zero flow"
Totalizer MINIMUM/MAXIMUM VALUE → STOP
The totalizer is paused until the fault is rectified.
ACTUAL VALUE
The fault is ignored. The totalizer continues to count in accordance with the current flow
value.
Totalizer stops
Status output In the event of fault or power supply failure: status output → Non-conductive No effect on status output

Endress+Hauser Proline Prosonic Flow 91 Specifications

General

Brand	Endress+Hauser
Model	Proline Prosonic Flow 91
Category	Measuring Instruments
Language	English