FMC Corporation - Talstar 80 - Handbuch (Seite 78)

Troubleshooting Proline Promass 80 PROFIBUS PA
78
702 P: MEDIUM INHOM.
!: # 702 0x43 UNCERT
AIN
Non specific
(uncertain
status)
Constant Fluid
inhomogeneous Cause:
Frequency control is not stable, due to inhomogeneous
process fluid, e.g. gas or solid content.
Remedy:
In particular with outgassing fluids and/or increased
gas content, the following measures are recommended
to increase system pressure:
– Install the instrument at the outlet side of a pump.
– Install the instrument at the lowest point of an
ascending pipeline.
– Install a flow restriction, e.g. reducer or orifice plate,
downstream from the instrument.
703 P: NOISE LIM. CH0
!: # 703 0x40
0x41
0x42 UNCERT
AIN
Non specific
(uncertain
status)
O.K.
Low
High
Noise Limit
Channel 0 Cause:
Overdriving of the internal analog to digital converter.
Causes:
Cavitation
Extreme pressure pulses
High gas flow velocity
A continuation of the measurement is still possible!
Remedy:
Change or improve process conditions, e.g. by
reducing the flow velocity.
704 P: NOISE LIM. CH1
!: # 704 0x40
0x41
0x42 UNCERT
AIN
Non specific
(uncertain
status)
O.K.
Low
High
Noise Limit
Channel 1
705 P: FLOW LIMIT
$: # 705 0x42 UNCERT
AIN
Non specific
(uncertain
status)
High
Limited
Flow limit Cause:
The mass flow is too high. The electronics' measuring
range will be exceeded.
Remedy:
Reduce flow
731 P: ADJ. ZERO FAIL
!: # 731 0x43 UNCERT
AIN
Non specific
(uncertain
status)
Constant Zero point
adjustment failure Cause:
The zero point adjustment is not possible or has been
canceled.
Remedy:
Make sure that zero point adjustment is carried out at
"zero flow" only (v = 0 m/s).
→ Page 62
No. Device status message
(local display)
PROFIBUS measured value status
Extended
diagnostic
message in the
PROFIBUS
master
Cause/remedy
Q
u
a
lit
y co
de (H
EX
)
M
e
asured va
lue st
atus
Qua
li
ty st
a
tus
Qu
ality
substatus
Li
m
its