FMC Corporation - Talstar 80 ユーザーズマニュアル

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).