Version 5.0 DUT-E Installation Manual
© 2007-2011, JV Technoton 27 of 30
Appendix 2. Tank calibration
The purpose of tank calibration is to find the dependence of the DUT-E output signal on the
fuel volume in the tank.
In the process of calibration the tank is filled with fuel in accurately batched portions of 1/10
to 1/20 volume of the tank. The size and number of batches are determined by technical
possibilities of the recording and display devices and geometric features of the tank.
For the measuring of fuel portions, please, use only verified measuring containers or fuelling
nozzles of gas stations or mini-gas stations.
1. Conditions for tank calibration
Only people who have studied the operational manuals for DUT-E and for recording and
display devices and who have experience with automotive electrical equipment can measure
the tank.
During tank calibration process the below given technical requirements should be followed:
a)
tank calibration can be performed only on the non-faulty vehicle;
b)
at the beginning of calibration procedure, the tank should be fueled for no more than
10% of the total volume;
c)
the tank calibration should be performed on a horizontal even surface. Vehicle loading
should not be changed during the procedure;
d)
wheels of the vehicle must be standard size;
e)
the tire pressure should correspond to the pressure set by the manufacturing factory for
the given vehicle;
f)
the vehicle must remain motionless, ignition on, engine is stalled;
g)
measuring containers and gas stations shall be verified and have inaccuracy of no more
than 0.25%;
h)
fuel batches should be filled into the tank sequentially with a pause of at least 0.5
minute.
2. Procedure of tank calibration
For a tank calibration the following procedures should be fulfilled:
a)
empty the tank;
b)
turn on the "ground" and the ignition;
c)
make the following setting on the recording and display devices "DUT-E output signal
does not depend on on-board voltage" (if such a setting available);
d)
detect the value of the DUT-E output signal with help of recording and display devices;
e)
record the initial fuel volume in the tank and value of the DUT-E output signal into the
calibration table (See Table 1.1);
f)
measure the earlier set portion of fuel with a measuring container and pour it into the
tank;
g)
wait until the DUT-E output signal indications stabilize (about 30-60 seconds);
h)
record the fuel volume in the tank and indications of the DUT-E output signal into the
calibration table (See Table 1);
i)
pour the next fuel batch into the tank. DUT-E output signal begins to change;
j)
fulfill items g) ... i) until complete filling of the tank;
k)
put the calibration table into the recording and display device or into DUT-E memory
(only for digital DUT-E).