Fuel Level Converter
Fuel Level Converter
Pulse converter for APP-type floats
 Output signal 05 V
 Power voltage 12 V
Purpose
Car manufacturers employ several different solutions
regarding the construction and function of fuel level
float sensors.
Fuel Level Converter is a device that adjusts the
output signal from the pulse float in the fuel tank (the
digital float) to standard voltage input of control
system recorders.
Construction and function
Fuel Level Converter is a device that requires
constant power supply at 12V. It is equipped with two
micro-switches that enable adjusting functional
parameters to particular requirements of a pulse float
in the fuel tank.
Fuel Level Converter converts a pulse with variable
amplitude and duration into a voltage signal of 0-5V.
Installation
Fuel Level Converter is installed in the vehicle cabin
right next to the control system recorder, so as to
prevent any interference or voltage drop. A pulse from
the pulse float in the fuel tank is sent to the input of
Fuel Level Converter. The output of Fuel Level
Converter should be connected to the voltage input of
the recorder.
Connection:
yellow and red
grey and black
yellow and green
grey and purple
-
+12V
ground
input
output
Installation steps:
1. Finding the cable:
The location of the cable depends on the make, year and lot of the vehicle.
The easiest way to locate the cable is to determine the color of the output
cables from the pulse float and track them all the way to vehicle gages.
2. Direction of voltage characteristics in the tank (inversely proportional or
directly proportional):
Using a tester (neon discharge tube), short-circuit the signal cable with
vehicle ground. After turning the key in the ignition, the fuel gage will incline.
 If the gage indicates full tank, it means that the characteristics is
inversely proportional (voltage at U=0V with full tank). In this case, set
the micro-switches when the tank is empty.
 If the gage indicates empty tank, it means that the characteristics is
directly proportional (voltage at U=max with full tank). In this case, set
the micro-switches when the tank is full.
3. Setting the micro-switches:
Micro-switch 1 is responsible for amplitude range of input signal
Micro-switch 2 is responsible for time-constant for sustaining input signal
MP ON
1
0-5 V
2
large

OFF
0-10 V
small
Determining the measuring range of input amplitude
- set micro-switches to OFF in order to set pulse amplitude
- if the voltage on Fuel Level Converter output is lower than 2.5V, set
micro-switch 1 to ON, setting amplitude range of input signal to 0-5V
- if the voltage on Fuel Level Converter output is higher than 2.5V, set
micro-switch 1 to OFF, setting amplitude range of input signal to 0-10V
 Determining time-constant for sustaining input signal
- set micro-switch 2 to ON in order to adjust the time-constant for
sustaining input signal
- if the voltage on Fuel Level Converter output is pulsating (fluctuating),
then it is necessary to set micro-switch 2 to OFF
- if the voltage on Fuel Level Converter output is constant, leave microswitch 2 at ON.
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