BS ISO 7210:2018 pdf download – Routine analytical cigarette-smoking machine — Additional test methods for machine verification 5.2.2 System A The signal delivered by the pressure transducer is linearized by appropriate circuits and transmitted to an integrator and a recording apparatus. The system can record a picture of the puff profile and measure its volume. 5.2.3 System B This system uses digital conversion and a computer to produce the same information as it is given by system A. 5.2.4 Requirements for both systems The device shall not increase the pressure drop of the system above the limit of 300 Pa and the overall gain and response of the system shall be sufficient to visualize the puff profile and determine its significant parameters. A sufficient result will be achieved by the use of elements that fulfil the following conditions: — laminar flow element with a nominal pressure drop of 100 Pa ± 10 Pa at a flow of 17, 5 ml/s; — pressure transducer with a suitable range, an accuracy of ± 5 Pa or better and a minimal response frequency of 1 kHz. The above apparatus provides the means to obtain flow rate and time profiles for puffing as shown in ISO 3308 and ISO 20778. NOTE Measurement of puff volume, by either system A or system B, can only be a secondary measurement following calibration by reference to a primary device such as a soap film burette as described in Clause 7. 5.2.5 Expression of results The following results need to be reported: — total drawn puff volume, in ml; — maximum flow rate, in ml/s; — time between starting and reaching the maximum flow rate, in s; — volume drawn after the time the puffing source ceases to apply suction, in ml; — total puff duration time, in s. The target values for the above parameters shall be those specified in ISO 3308 and ISO 20778. 6 Verification of restricted smoking 6.1 Principle Measurement of the volume of the smoulder stream smoke between two puffs for machines of discontinuous function or between two suction strokes for machines of continuous function. For smoking machines with permanent connection of the port to the suction device, this test is not necessary. 6.2 Apparatus Apparatus permitting an assembly as shown in Figure 3, so that: — the length of a soap film bubble flowmeter does not exceed 12 cm; — there is...

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