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CNGmass DCI
!
No.
Error message / Type
P = Process error
$ = Fault message (with an effect on the inputs and outputs
! = Notice message (without any effect on the inputs and outputs)
700
P: EMPTY PIPE
$: # 700
701
P: EXC. CURR. LIM
$: # 701
702
P: FLUID INHOM.
$: # 702
703
P: NOISE LIM. CH0
$: # 703
704
P: NOISE LIM. CH1
$: # 704
705
P: FLOW LIMIT
$: # 705
731
P: ADJ. ZERO FAIL
!: # 731
Endress+Hauser
10.3
Process error messages
Process errors can be defined as either "Fault" or "Notice" messages and can thereby be weighted
differently. You can define messages in this way with the aid of the function matrix (
→ "Description of Device Parameters" manual).
Note!
• The listed error message types below correspond to the factory setting.
• See also the information on → ä 28.
Cause
The process fluid density is outside the upper or lower
limit values set in the "EPD" function.
Causes:
– Air in the measuring tube
– Partly filled measuring tube
The maximum current value for the measuring tube
exciter coils has been reached, since certain process fluid
characteristics are extreme, e.g. high gas or solid
content.
The device continues to work correctly.
Frequency control is not stable, due to inhomogeneous
process fluid, e.g. gas or solid content.
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!
The mass flow is too high. The electronics' measuring
range will be exceeded.
The zero point adjustment is not possible or has been
canceled.
Remedy / spare part
1. Ensure that there is no gas content in the process liquid.
2. Adapt the values in the "EPD RESPONSE TIME" function to
the current process conditions.
In particular with outgassing fluids and/or increased gas content,
the following measures are recommended to increase system
pressure:
1. Install the device at the outlet side of a pump.
2. Install the device at the lowest point of an ascending pipeline.
3. Install a flow restriction, e.g. reducer or orifice plate,
downstream from the device.
Change or improve process conditions, e.g. by reducing the flow
velocity.
Reduce flow.
Make sure that zero point adjustment is carried out at "zero flow"
only (v = 0 m/s). → ä 52
Troubleshooting
67
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