3. Calibration work status
Note: only in the unit LTR for calibration
Factory calibration automatically, please follow these steps:
Batteries are not installed on the body, then a short circuit board jumpers J2,
after the installation of batteries, it will display
00000
, in which means it has been
entered into the calibration status, install the control panel to the shell.
When 100 liters of calibration liquid flows at the control pipeline, the flow value
of the flowed liquid will be displayed on LCD screen. The liquid flows out, about
30 seconds, control panel will record the flow value, calculate the flow
coefficient (
k
) values and deposited CPU of the permanent preservation of
non-volatile memory, even removed the battery discharge coefficient (
k
) will not
lose value. If the flow of calibration error over more than the limited 10%, the
panel will consider the current calibration value is invalid, and will not record the
current calibration value, the screen will show the letters Err, and then show
the figure
00000
, re-entry into the auto-calibration status.
If the calibration successful, still want to re-calibration, please remove
the batteries, repeat the above steps.
Automatic calibration is completed, please remove the battery, then disconnect
the circuit board jumper J2, then the battery can be fitted into the normal
working status
User manual calibration by following these steps:
To press "
DISPLAY
" and "
CALIBRATE
" button about 2 seconds at the same time
will enter the user manual flow coefficient (
k
) calibration status, such as:
k
= 46.33,
at this time LCD display information in Figure 2.
C46.33
Figure 2
Numerical after "
c
" ( such as 46.33 ) is the modified flow coefficient (
k
) value, the
number of flashes that can be modified, and modify the scope: 0 to 9, the position
can be shifted by press the "
CALIBRATE"
button shortly
To press "
DISPLAY
" shortly can increase the numerical from 0 to 9, increase only ,
can not reduce.
After modification, press "
DISPLAY
" and "
CALIBRATE
" buttons simultaneously,
it can return to normal working status.
User manual flow coefficient (
k
) calibration correction formula
When the user found that the actual traffic flowed liquid flow has a larger error with
displayed flow, using the following formula to re-calculated
k
value
