KROHNE UFM 610P EN - Manual (Page 41)

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4.6.7 Correction factor
This is a facility that can be used when errors occur due to lack of straight pipe or the sensors have been placed too close to a
bend, this could give an incorrect reading to what is expected. The user can set this as a % in the same way as the calibration
factor, but it will not be stored in the memory.
4.6.8 Diagnostics
4.6.8.1 Calculated
µ
s
This is a value the instrument predicts will be the time in
µ
secs that it should take for the transmitted signal to go across a
particular pipe size. This value is ascertained from the data entered by the user. i.e. pipe size, material, sensor set etc.
4.6.8.2 Up
µ
s, DN
µ
s
This is the actual transit time measured by the instrument and will be slightly (5-10
µ
s depending on the pipe size and signal
condition) less than the calculated value above.
4.6.8.3 Measurement
µ
a
This is a point in the signal transmitted, where the flow measurement is taken from. It is used to see if the signal is being taken
from the burst, at the correct time to get the strongest signal. This is normally used on smaller pipes when the instrument is
being used in double or triple bounce were signals can sometimes interfere with each other. This value is normally a few
µ
s
below the Up
µ
s, Dn
µ
s value.
4.6.8.4 Phase up/DN
µ
s
This is only valid if calculated
µ
s and up
µ
s, Dn
µ
s are correct. If the reading is zero then there is no signal, which could mean
the pipe is empty, or the liquid is contaminated with particles or air.
4.6.8.5 Phase offset
This value will be between 0 and 15. The exact value is not important and will vary between applications. It should, however, be
stable in the short term, but could change with time and temperature over the longer term. As the flow rate reaches its maximum
this figure will continuously scroll between 0 and 15 which means it has reached its maximum flow rate capabilities and the
display will read unstable flow.
4.6.8.6 Flow m/s
This displays flow velocity in m/sec to 3 decimal places
4.6.8.7 Signal
This is the averaged value of Signal up/dn below, and is a value between 800 and 2400 which calculates the signal strength as a
percentage (800=0%, 2400=100%).