Filter
Top Products
10
Set up instrument - 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, when the unit is switched off.
Set up instrument – Diagnostics
The following list allows Micronics to see if
the instrument is functioning correctly, and
if the signals are being sent and received
in the correct way.
Calculated μs
This is a value the instrument predicts will
be the time in μsecs 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.
Up μs, Dn μs
This is the actual transit time measured by
the instrument and will be slightly (5-10μs
depending on the pipe size and signal
condition) less than the calculated value
above.
Measurement μs
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. It is normally used on
smaller pipes when the instrument is being
used in double or triple bounce as signals
can sometimes interfere with each other.
This value is normally a few μs below the
Up μs, Dn μs
value.
Phase up/dn μs
Only valid if Calculated μs and Up μs, Dn
μs 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.
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 when the flow condition is good
and velocity is within the range of the
transducers being used. As the flow rate
increases towards and beyond the
maximum, this figure will continuously
change. In flow mode the instrument will
read unstable or high flow.
Flow (m/s)
This displays flow velocity in m/sec to 3
decimal places.
Signal
This is the average value of Signal up/dn
and is a value between 800 and 2400
which
Display’s the signal strength as a
percentage (800=0%, 2400=86%).
Signal up/dn
This value is internal to the electronics and
must be greater than 800. There is an
option in the SET UP INSTRUMENT menu
to allow this value to be taken down to 400
in extreme circumstances and is useful on
some applications when the signal levels
are poor.
Sensor separation
This is a reminder for the user to check for
correct sensor separation and sensor
mode.
STATUS/ERROR/WARNING
MESSAGES
There are three types of message that will
appear, Status, Error and Warning. These
messages appear under the time and date
on the display when in flow mode.
Status Messages
S1: Initialising
Appears when first entering flow mode to
show instrument is starting up.
Error Messages
E1: unstable or high flow
This error message occurs when either the
sensors have been positioned too near to
an obstruction or bend causing turbulence,
or the instrument is being used outside its
normal flow range. When the instrument is
programmed it calculates the maximum
flow rate and if this is exceeded then the
high flow message occurs.
E2: No Flow Signal
This message appears when the two
transducers cannot send or receive
signals, which could happen for various
reasons. Firstly check that all cables are
connected, transducers are on the pipe
correctly with grease between the sensor
face and the pipe.
No flow signal will happen if:
• The pipe is empty or partially filled.
• The liquid is aerated.
• The particulate content of the liquid is
too high.