AS 2026:2003 pdf free
AS 2026:2003 pdf free.Laboratory glassware – Density hydrometers
The reference temperature for density hydrometers excluding the special sub-series L50SP,M50SP and S50SP shall be 20°C. When used in a liquid at this temperature, the hydrometers shall indicate the density of the liquid at 20°C.
The reference temperature for density hydrometers of the special sub-series L50SP, M50SP and S50SP shall be either 20°C or 15°C. When used in a liquid at the appropriate temperature, the hydrometer shall indicate the density of the liquid at that temperature.
The bulb and stem shall be made of clear glass which is free from stress and visible defects.
NOTE: The use of thin wall glass tubing is necessary to achieve adequate buoyancy.
Solid loading material shall be fixed securely into the bottom of the bulb.
The scale and inscriptions shall be clearly and permanently marked in black on smooth white paper and shall be securely fixed in the stem.
The hydrometer shall be able to withstand a temperature of 80°C for a period of 1 h without exhibiting deterioration of any part.
The stem and bulb shall be circular in cross-section and symmetrical about the main axis.
There shall be no abrupt changes in section that could hinder cleaning and drying or permit air bubbles to be trapped. The preferred form of hydrometer is shown in Figure 1.
The hydrometer shall float so that the stem is within 1.5 degrees of vertical for all readings within the range of the scale.
The dimensions of the hydrometers are as follows:
(a) The dimensions of the hydrometer shall conform to those given in Table 1.
(b) The cross-section of the stem shall remain unchanged for at least 5 mm below the lowest graduation line.
(c) The stem shall extend at least 25 mm above the top graduation line.
(d) No hydrometer shall have a stem of diameter less than 4 mm.
(e) The stem diameters recommended for the range of hydrometers are listed in Table 2.AS 2026 pdf free download.
