Digatron DT-47FT Manual

Introduction

The DT-47FT is Digatron's fuel indicator that performs two electrical tests for preliminary screening of
fuels. This is done by comparing the dielectric constant and the direct current conductivity of a
competitor's fuel to a known base. Fuel with added oxidizers will cause the instrument to register more
positive than the base. This indicates a possible additive to the competitor's fuel. This instrument is an
excellent first screening for illegal compounds added to fuel, but it is not a final test. Only a lab analysis
can confirm the presence of specific substances.

Basic Operation

The DT-47FT is designed to be turned on and used, simply put the sensor in the sample fuel. If the
instrument is showing a negative number, the fuel is legal. If the reading is slightly positive, we
recommend recalibrating the instrument, testing the fuel again and performing Test 2. 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.

Base Material

The base material called for by both the IKF and WKA is Cyclohexane (C6H12). You will need to have
some available before you begin testing. Cyclohexane is available from Precision Auto Research (630)
766-4402, IKTL (707) 778-1820 and VP Racing Fuels (210) 635-7744.
Cyclohexane should always be fresh and uncontaminated. A fresh can of Cyclohexane is recommended
each day. The Cyclohexane should be placed in plastic, never glass or metal. The container should be
placed on wood or plastic or held in the air.
If you are unable to obtain Cyclohexane, an alternate method of testing is to mix a known legal gas with
commonly used oil. Set the meter at zero in that mixture and allow no more than a five point deviation
either way. This method is much less accurate than using the Cyclohaxane base.

The Three Modes of the DT-47FT

This instrument has three basic modes of operation: Calibration, Test and Recall.
•
Test Mode is the mode the instrument is in when turned on. This is the mode where the fuel tests
are performed.
•
Calibration Mode lets you change the calibration numbers of your instrument in two ways,
manually or automatically.
•
Recall Mode lets you view the results of the groups of tests stored in memory. Up to eight groups
can be stored in the instrument. A group consists of a reading from each of the three tests.