Endress+Hauser prosonic flow 92, Operating Instructions Manual

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9 Trouble-shooting Prosonic Flow 92
52 EHauser
9.4 Response of outputs to errors
!
Note!
The failsafe mode of current outputs can be customised by means of various functions
in the function matrix. You will find detailed information on these procedures in the
“Description of device functions” appendix (see Section 11).
Low flow cut-off and failsafe mode:
You can use “low flow cut-off” to set the signal of the current output to its fallback value,
for example when measuring has to be interrupted while a pipe is being cleaned. This
function takes priority over all other device functions. Simulations, for example, are sup-
pressed.
Failsafe mode of outputs
Process/system error is present Low flow cut-off is activated
"
Caution!
System or process errors have no effect whatsoever on the inputs and outputs. See the information on
Page 39 ff.
Current output Hold Value
4...20 mA
→
Last measured value
MIN. CURRENT
4–20 mA
→
0.8 mA
MAX. CURRENT
4–20 mA
→
23.2 mA
ZERO
4...20 mA
→
4 mA
Output signal corresponds to
“zero flow”