Process Error Messages - Endress+Hauser PROline prosonic flow 90 Operating Instructions Manual

9 Trouble-shooting
!
78
9.3

Process error messages

Process errors can be defined as either "Fault" or "Notice" messages and can thereby
be weighted differently. Determination of this is done via the function matrix
( o see the "Description of Device Functions" manual).
Note!
The error types listed in the following correspond to the factory settings.
Also observe the information on Page 44 ff. and 80.
Type Error message / No.
P = Process error
$
= Fault message (with an effect on the inputs and outputs)
! = Notice message (without an effect on the inputs and outputs)
P PIPE DATA
$
# 468
P S.VELOC. RANGE
$
# 491
P INTERFERENCE
! # 494
P FLOW LIMIT
! # 705
Cause
The inner diameter is negative.
The sound velocity is outside the
search range of the transmitter.
The pipe transmitted wave may
superpose the signal. We recom-
mend you alter the sensor config-
uration in the event of this error
message.
"
Caution!
A change of the sensor configu-
ration is required if the measuring
device indicates zero or low flow.
The mass flow is too high.
The electronics' measuring range
will be exceeded.
PROline Prosonic Flow 90
Remedy
– In the function group PIPE
DATA check the values of the
functions CIRCUMFERENCE
and WALL THICKNESS resp.
LINER THICKNESS.
– Check the installation dimen-
sions.
– If possible, check the sound
velocity of the fluid or check
the specialist literature.
If the actual sound velocity is
outside the defined search
range, the corresponding
parameters must be changed
in the LIQUID DATA function
group. Detailed information on
this topic is provided in the
Description of Device Func-
tions Prosonic Flow 90 (BA
069D/06/en) manual under the
SOUND VELOCITY LIQUID
function.
– In the SENSOR
CONFIGURATION function,
change the number of
traverses from 2 or 4 to 1 or 3
and mount the sensors accord-
ingly."
– Reduce flow
Endress+Hauser