ISO 3405:2019 pdf free

ISO 3405:2019 pdf free.Petroleum and related products from natural or synthetic sources – Determination of distillation characteristics at atmospheric pressure
The flask support board shall be constructed of ceramic or other heat-resistant material, 3 mm to 6 mm in thickness and shall have a central opening conforming to the dimensions given in Table 2. The flask support board shall be of sufficient dimension to ensure that thermal heat to the flask only comes from the central opening and that extraneous heat to the flask other than through the central opening is minimized. The flask-support board may be moved slightly in accordance with the directions for positioning the distillation flask so that direct heat is applied to the flask only through the opening in this board. The position of the flask is set by adjusting the length of the side-arm inserted into the condenser.
Type 2 for use with an electric heater (see Figure 2). The flask- support is a platform on top of the electric heater and adjustable from the outside of the shield. The flask support board described in 5.6.1 is mounted on this support. Provision shall be made for moving the upper (flask-support) board slightly in the horizontal plane to ensure that direct heat is applied only through the specified opening in this board. The flask-support assembly shall be able to move vertically to ensure contact of the flask-support board with the bottom of the distillation flask during the distillation, and to allow for easy mounting and removal of the distillation flask from the unit.
The temperature sensor shall be fitted through a snug-fitting device designed for mechanically centring the sensor in the neck of the distillation flask without vapour leakage. The use of a cork or silicone rubber stopper with a hole drilled through the centre is not acceptable for this purpose. Examples of acceptable centring devices are shown in Figures 6 and 7.
The barometer shall be capable of measuring atmospheric pressure with an accuracy of 0,1 kPa or better, at the same elevation relative to sea level as the apparatus in the laboratory. Do not take readings from aneroid barometers that are pre-corrected to give sea level pressures.ISO 3405 pdf free download.