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Installation, use and maintenance
M0033E
3 CALIBRATION
K44 / K33 are pre-calibrated in factory to be used with Diesel oil. As specific operating conditions (suchas
real flow rate, nature andtemperature of the measured fluid) may affect the meter accuracy, a re-calibration
should be carried out afterthe installation has been completed. A new calibration is necessary eachtime the
meter is disassembled formaintenance operations or when it isused to measure fluids that differ fromDiesel
oil.
4 CALIBRATION PROCEDURE
1. Unscrew the plug (see diagram 1,pos. “14”).
2. Purge the system (pump, pipelines, meter) of air by dispensing until the flow stream is full and steady.
3. Stop the flow by shutting off the nozzle, but let the pump running.
4. Reset the batch register by means of the reset knob (pos. “2”).
5. Dispense at the flow rate which thebest accuracy is required at, by using a calibration container having a
capacity not lower than 20 litres. Do not reducethe flow in order to reach the graduated zone of the calibra-
tion container. Theright method is to start and stop the fullflow repeatedly until the required fillingis obtained.
6. Compare the indication of the calibration container (real value) withthe one of the meter (indicated value).
- If the indicated value is higher than the real value, loosen the screw (pos. “12”);
- If the indicated value is lower than the real value, tighten the screw (pos. “12”).
7. Repeat the operations 4 to 6 until accuracy is satisfactory.
8. Tighten the plug (pos. “14”) again. The O ring which the calibration screwis provided with, has the function
to avoid accidental loosening of the adjustment screw but does not haveany sealing functions. Therefore it is
always necessary toproperly fix the plug with the sealinggasket (pos. “12”).
5 USE
After installation and calibration K44 /K33 is ready to work. Turn the reset knob (see diagram 1,pos. “12”)
(clockwise if it is mounted on the left of the meter and anticlockwiseif it is mounted on the right) until the batch
register is completely reset. The totaliser cannot be reset in any way. Make sure that during use pressure
does not exceed the value indicated insection “Technical data”.
6 USE BY GRAVITY
K44 / K33 can also be used in fuel units which are not equipped with pump sand where the flow is generated
by the difference in fuel level between the tank and the nozzle outlet. As a reference, a system composed ofa
tank off the ground, with the meter installed right at the bottom of the tank,a 3-m long 1’’ flexible pipe and
a manual nozzle type Self 2000, guarantees aflow rate of approximately 30 litres/minute if the difference
in level is higherthan 1.5 metres. Longer pipes or nozzles producing higher pressure losses reduce the flowin
respect to the existing difference inlevel. Use by gravity is not recommended with differences in level lower
than 1metre, as the consequent reduced flowrate causes the meter to work outside its guaranteed accuracy
range. On field calibration is always advisable in case of gravity installations.
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