Endress+Hauser dosimass, Руководство по эксплуатации

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Troubleshooting Dosimass
28 Hauser
PN # 701
EXCITING CURRENT
LIMIT
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 instrument continues to work
correctly.
In particular with outgassing fluids and/or
increased gas content, the following
measures are recommended to increase
system pressure:
1. Mount the instrument on the pressure
side of a pump.
2. Mount the instrument at the lowest
point of an ascending pipeline.
3. Install a valve or orifice plate
downstream from the measuring
device.
PN # 702
FLUID
INHOMOGENEOUS
Frequency control is not stable due to
inhomogeneous fluid properties e.g.
gas or solid content. In particular with outgassing fluids and/or
increased gas content, the following
measures are recommended to increase
system pressure:
1. Mount the instrument on the pressure
side of a pump.
2. Mount the instrument at the lowest
point of an ascending pipeline.
3. Install a valve or orifice plate
downstream from the measuring
device.
PN # 704
NOISE LIMIT CH1
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!
Change or improve process conditions, e.g.
by reducing the flow velocity.
PN # 704
NOISE LIMIT CH1
PN # 705
FLOW LIMIT
The mass flow is too high. The
electronics' measuring range is
exceeded. Reduce flow
PN # 731
ZERO ADJUST NOT
POSSIBLE
Zero point is not possible or has been
canceled. Make sure that zero point adjustment is
carried out at "zero flow" only

(v = 0 m/s (0 ft/s))
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21.
Type No./error message Cause Remedy / spare part