Fuel Test 2: FT2 measures the direct current (DC) conductivity of the fuel. Keeping the sensor in the fuel,
press and hold the DC button to perform FT2. The results of the test will be displayed while the button is
held down. A 2 will also appear on the left of the display to signify test 2.
FT2 should read 0 to +1. A reading greater than +1 indicates possible additives in the fuel. The more
positive the number, the greater the possibility that the fuel contains illegal additives. Illegal or disputed
test results should be confirmed by laboratory analysis.
Temp: To measure the temperature of the fuel, press and hold the Temp button. The temperature will be
displayed, in Fahrenheit, on the instrument while the button is held down. A 3 is displayed on the left side
of the display when the Temp button is held down.
Store: Press the Store button to perform and record all three tests. The test group number (G#) will be
displayed while you hold the Store button down. The display will show SG (storing group) while recording
these values. This takes about six seconds.
The DT-47FT can store up to eight test groups. After recording eight groups, the instrument will display
FUL and must be reset or turned off and back on to store more groups. (See the Reset Memory to Zero
section.)
B. Calibration Mode
It is important to calibrate the instrument any time the air or fuel temperatures change more than 5°F.
Calibration mode is entered from Test mode by pressing the Temp and Power buttons at the same time.
The display flashes while the instrument is in Calibration mode.
Your DT-47FT allows you to automatically calibrate the base numbers to –75 for FT1 and 0 for FT2 or to
manually adjust the base numbers of the fuel tests to a number of your choice. The goal of setting –75 for
the base solution is to have FT1 display a negative
number for a legal fuel and a positive number if the fuel
is illegal. For current fuels, -75 is the number of choice.
Autocal (optional): Press the Autocal button when the instrument is in Calibration mode and the sensor
has stabilized in Cyclohexane. The instrument will automatically calibrate FT1 to –75 and FT2 to 0. It
takes the instrument about 25 seconds to do this calibration. The display of your instrument will show A C
while this takes place.
Manual Calibration of FT1: Once in Calibration mode put your sensor in a plastic container of
Cyclohexane. Be sure the sensor is covered by the Cyclohexane and let the sensor stabilize (the numbers
on the display of your instrument will stop changing).
Use the arrow buttons to set the base number to the desired number. For current commercial pump
gasoline, we recommend –75. With this number, the instrument displays zero or below for legal fuel. A
positive number indicates possible additives in the fuel.
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