GB/T 27503-2011Test solutions of electrolytic conductivity analyzer - Preparation method of sodium chloride solutions (English PDF)

GB/T 27503-2011 is the English-translated version of 电导率仪的试验溶液 氯化钠溶液制备方法.

GB/T 27503-2011 gives the method for preparing the sodium chloride test solutions of the electrolytic conductivity analyzer.

Clause 1 states that the standard specifies the reagents, the instruments or equipment and the preparation steps used to prepare the sodium chloride solution, together with the correspondence between the concentration of the solution and its resistivity, and that it applies to the preparation of the sodium chloride solution, called the solution below, required for testing a conductivity meter.

Clause 2, "Reagents", calls for analytical reagent sodium chloride and for distilled or deionized water of conductivity not greater than 0.2 x 10^-6 S/cm.

Clause 3, on the instruments or apparatus required, calls for a balance of maximum weighing not more than 200 g with a verification scale value of 0.1 mg and an electric oven covering 0 to 300 degrees Celsius.

Clause 4, on the preparation steps, sets the environmental conditions as an ambient temperature of (20 plus or minus 2) degrees Celsius and a relative humidity below 85%, and has the sodium chloride dried in the electric oven at a controlled temperature of 220 to 240 degrees Celsius for at least 2 h, cooled to room temperature, then weighed and added to a certain mass of water and mixed thoroughly to obtain the solution of the required mass fraction, with an uncertainty not exceeding 0.25%.

Clause 5, on the resistivity and conductivity of the solution, gives in Table 1 the resistivity of solutions of different concentrations at 18 degrees Celsius, in Table 2 the temperature coefficient of the solution over the temperature range of 0 to 140 degrees Celsius and in Table 3 correction values of that temperature coefficient in the low concentration range, and gives formula (1) for calculating the resistivity of the solution at other temperatures.

The draft on the page breaks off inside clause 5, and the page lists no normative references and no normative references clause for this standard.

The foreword states that the standard was drafted according to the rules given in GB/T 1.1-2009, was proposed by the China Machinery Industry Federation, is centrally managed by SAC/TC124/SC6 of the national industrial process measurement and control instruments standardization technical committee, and was drafted by Shanghai Precision Scientific Instrument Co., Ltd., the Shanghai Measurement and Testing Technology Research Institute and East China Normal University among others. It was issued on 2011-10-31 and has applied since 2012-01-01.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.

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