Alemite 8424 Service Manual - Page 4
Browse online or download pdf Service Manual for Measuring Instruments Alemite 8424. Alemite 8424 9 pages. Flow meter
Print PageSER 8424
If one of the two keys RESET or CAL is accidentally
pressed during the count, this will have no effect.
Note: Even though in this mode they are not
displayed, both the Reset Total and the Gen-
eral Total (Total) increase. Their value can
be checked after dispensing has terminated,
returning to "Normal" mode, by quickly
pressing CAL.
Partial Reset
To reset the Partial Register, finish dispensing and wait
for the Remote Display to show a Flow
Rate of 0.0 as indicated in the illustration
then quickly press RESET.
Calibration
Calibration factor or "k factor": Multiplication factor
applied by the system to the electrical pulses received, to
transform these into measured fluid units.
Factory K Factor:
Factory-set default factor. It is equal to 1,000. This
calibration factor ensures utmost precision in the
following operating conditions:
Fluid:
Diesel Exhaust fluid
Temperature:
20°c
Flow rate:
10-120 liters/min. (2.6-31.7 gal/min)
Even after any changes have been made by the user, the
factory k factor can be restored by means of a simple
procedure.
User K Factor:
Customized calibration factor, meaning modified by
calibration.
Why Calibrate?
When operating close to extreme conditions, such as
for instance with fluids close to acceptable range extremes
(like diesel exhaust fluid at low temperatures) or in
extreme flow rate conditions (close to minimum or
maximum acceptable values), an on-site calibration may
be required to suit the real conditions in which the 8424 is
required to operate.
Revision (1-11)
Calibration Procedure
8424 permits making quick and precise electronic
calibration by changing the calibration factor (k factor).
There are 2 different ways of calibration:
1. On-site calibration, performed by means of a
dispensing operation.
2. Direct calibration, performed by directly changing the
k factor.
To enter the calibration phases it is necessary to press
and hold down the "cal" button. Why enter the calibration
phases?
• Display the currently used calibration factor
• Return to factory k factor after a previous calibration
with user k factor
• Change the calibration factor using one of the two
previously indicated procedures.
In calibration mode, the partial and total dispensed
quantities indicated on the display screen take on different
meanings according to the calibration procedure phase.
During the calibration, the 8424 cannot perform any
normal dispensing operations. In calibration mode, the
totals are not increased.
WARNING
The 8424 features a non-volatile memory.
It keeps the calibration and dispensing data stored
even after replacing batteries or long periods of
inactivity.
Display Of Current "K Factor" And
Restoring "Factory K Factor"
By pressing the cal key while the
appliance is in standby, the display page
appears showing the current calibration
factor used.
If you are using 8424 with "factory k
factor", the display page shown in the
diagram will be displayed, with the word
"fact".
If "user k factor" has been set, the calibration factor
set by the user (in our example 0.998) will be displayed.
4
Flow Meter
Alemite, LLC