10 Troubleshooting
10.6 Problems with the totalizers
FLUXUS F60*
2017-10-16, UMFLUXUSF60xV5-0EN
116
The entered cut-off flow is too high
All flow velocities below the cut-off flow are set to zero. All derived quantities are also set
to zero. The cut-off flow has to be set to a low value to be able to measure at low flow ve-
locities (default: 2.5 cm/s).
The entered pipe roughness is not appropriate
The flow velocity of the fluid is outside the measuring range of the transmitter
The measuring point is not appropriate
Check whether a different measuring point provides better results. Because pipes are
never rotationally symmetric, the flow profile is affected.
10.6
Problems with the totalizers
The values of the totalizers are too high
See
Special Funct.\SYSTEM settings\Measuring\Quantity recall
. If this
menu item is activated, the values of the totalizer will be stored. The totalizer will continue
with this value at the start of the next measurement.
The values of the totalizers are too small
One of the totalizers has reached the upper limit and has to be reset to zero manually.
The sum of the totalizers is not correct
See
Special Funct.\SYSTEM settings\Measuring\Quant. wrapping
. The
sum of both totalizers (throughput) transmitted via the output is no longer valid after the
first overflow (wrapping) of one of the totalizers.
10.7
Problems during the heat flow measurement
The measured values for the fluid temperature differ from the actual values.
The temperature probes are not sufficiently insulated.
On a pipe with a small pipe diameter, the temperature probe is lifted from the pipe sur-
face by the insulation foam.
The measured absolute value of the heat flow is correct but has the opposite sign.
Check the assignment of the supply and return temperature to the temperature inputs.
The calculated heat flow differs from the actual heat flow although the measured
flow and temperature values are correct
Check the heat flow coefficient of the fluid.