IS0 6297: 1997 pdf download – Petroleum products – Aviation and distillate fuels – Determination of electrical conductivity.
1 Scope This International Standard specifies a method for the determination of the electrical rest conductivity of aviation and distillate fuels with or without a static dissipator additive. The method measures conductivity when the fuel is uncharged, i.e. electrically at rest (known as rest conductivity). Two methods are available for fuel conductivity measurement, either using a portable meter for the direct measurement in tanks or laboratory and field measurement of samples, or using an in-line meter for continuous measurement of fuel conductivities (equivalent to rest conductivity) in a flowing stream. When using either type of instrument care should be taken in allowing the relaxation of residual electrical charges before measurement and in preventing contamination. The procedure can be used to measure conductivities from . 1 . . 11. 1 .d . 1 . ” -* 1 pS/m to 2 000 pS/m using the equipment used to establish the reported precision. The range can be extended to greater than 2 000 pS/m with the correct selection of electrode size and current measuring apparatus. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent edition of the standards indicated below. Members of IEC and IS0 maintain registers of currently valid International Standards. IS0 3 17 1: 1988, Petroleum liquids – Automatic pipeline sampling. ASTM D4057 : 1988, Standard Practice for iManual Sampling of Petroleum and Petroleum Products 3 Definitions For the purposes of this International Standard the following definition applies.4 Principle A voltage is applied across two electrodes immersed in the fuel and the resulting current expressed as a conductivity value. With portable meters, the current measurement is made almost instantancously upon application of the voltage to avoid errors arising from ion depletion. Ion depletion or polarization is eliminated in dynamic monitoring systems by . continuous replacement of the sample in the measuring cell. 5 Reagents 5.1 Propan-2 -ol, reagent grade. 5.2 Toluene, reagent grade.