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figure they wish including a minus figure
for reverse flow conditions.
Output mA For Error
This gives an error output to inform the
user of loss of signal. The figure set to
between zero and 24mA, but defaults to
22mA.
Exit
RS232 Key
Not available on this instrument.
Logger Key
Not available on this instrument.
Delete Key
If anything is entered in error, press the
DELETE key and re-enter the information
required.
Options Key
This can only be used in flow mode. Scroll
down the options then press ENTER to
select.
OPTIONS
Cutoff (m/s) 0.05
Set zero
Total RUN
Reset + total
Reset – total
Damping (sec) 5
Cal Factor 1.00
Corr Factor 1.00
Diagnostics
Exit
Options key - Cut Off (m/s)
The instrument has an automatic CUTOFF
which defaults to 0.05 m/s. Micronics
cannot guarantee measuring flows below
this range due to the nature of the
applications, installation, and instabilities
in the measuring system.
Adjusting the cutoff allows the user not to
see or record any flow below that figure.
For example it may be that the user may
not want to measure flows below 50 LPM
in a 50mm pipe which is equivalent to 0.42
m/sec. In this case 0.42 m/sec would be
entered into the instrument and nothing
would be recorded below that level. The
maximum cut off is 1 m/sec.
Options key – Set zero flow
On some applications and in some
conditions it may be possible that although
there is no flow the instrument may show a
small offset due to “noise” or “ringing”. The
offset can be cancelled out and will
increase the accuracy of the instrument.
Selecting this option and pressing ENTER
the display will show the following.
Stop the flow
COMPLETELY and
press ENTER or
SCROLL to cancel
Pressing ENTER before the flow has
stopped will result in a message asking if
you are you sure the flow has stopped.
This occurs when the flow is still above
0.25m/sec.
When this facility has already been
selected, press ENTER to cancel the
previous instruction, it is then possible to
re-set the Zero balance. The option is not
available when error messages E1 and E2
(See 10) are being displayed.
Set up instrument - Total
This option allows the user to disable the
positive and negative totalizers. When you
select either of these options the totaliser
will start or stop functioning. It does not
zero the total, this is a separate function
described below.
Set up instrument - Reset + Total
and - Total
The Portaflow 204 Plus! has a forward and
reverse totaliser that can be reset. Use the
scroll keys to select and press ENTER to
reset. The Total is stored when the unit is
switched off or battery goes flat.
Set up instrument - Damping (sec)
Damping maybe used when the flow
readings are unstable due to turbulence
caused by obstructions or bends etc.
Damping or averaging can be used to
make the readings more stable. It can be
set to up-date the display, anything
between 3 and 100 seconds.
Set up instrument - Calibration
Factor
This allows the user to calibrate the unit
for a specific application. If for example the
flow reading is 4% higher than expected
entering 0.96 will reduce the reading by
4%. If the reading is 4% lower than
expected then entering 1.04 would
increase the reading by 4%.
When the instrument is supplied it will
always default to 1.00 and when this is
changed it will stay in the memory, until
such time as it needs to be changed
again.