FMC Corporation - Talstar 80 - Handbuch (Seite 77)

Proline Promass 80 PROFIBUS PA Troubleshooting
77
9.3 Process error messages
!
Note!
See the information on
→ Page 40
9.3.1 Displaying the device status on PROFIBUS PA
Further information
→ Page 71
9.3.2 List of process error messages
No. Device status message
(local display)
PROFIBUS measured value status
Extended
diagnostic
message in the
PROFIBUS
master
Cause/remedy
Q
u
alit
y co
de
(H
EX
)
Measured v
a
lue
status
Qu
ality
sta
tu
s
Qua
li
ty su
bs
ta
tu
s
Lim
its
P = Process error
$ = Fault message (with an effect on the outputs)
! = Notice message (without any effect on the outputs)
700 P: EMPTY PIPE
!: # 700 0x53 UNCERT
AIN
Sensor
conversion
not accurate
(measured
value from
sensor not
accurate)
Constant Empty pipe
detected Cause:
The process fluid density is outside the upper or lower
limit values set for empty pipe detection.
Causes:
Air in the measuring tube Partly filled measuring tube
Remedy:
1. Ensure that there is no gas content in the process
liquid.
2. Adjust the upper or lower limit value for empty
pipe detection to the current process conditions.
Access:
BASIC FUNCTIONS
→ PROCESS PARAMETER →
EPD PARAMETER
→ EPD VALUE LOW or EPD
VALUE HIGH
701 P: EXC. CURR. LIM
!: # 701 0x40
0x41
0x42 UNCERT
AIN
Non specific
(uncertain
status)
O.K.
Low
High
Excitation too high Cause:
The maximum current value for the sensor coils has
been reached, since certain process fluid characteristics
are extreme, e.g. high gas or solid content.
The instrument continues to work correctly.
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.