Practical use of commercially available compressed (dry gas) alcohol standards

M. Rosland, Jacqueline Montpetit, V. Mendes
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Abstract

ABSTRACT Approved Instruments for Breath Testing in Canada require the use of alcohol standards to ensure that they are in proper working order at the time of testing. Newer generation breath testing instruments allow for the use of Dry Gas (ethanol and nitrogen in compressed gas tanks) as the alcohol standard. Three areas were evaluated: (1) consistency of alcohol readings over time as the gas tank depletes; (2) altitude compensation in the Intox EC/IR II and Datamaster-DMT at two different elevations; and (3) the effect of exposing the dry gas tanks to weather conditions that could be encountered during shipping or storage. The results demonstrated that (1) the concentration of alcohol was found to remain stable as the tank emptied; (2) both instruments correctly compensated for the change in atmospheric pressure due to elevation change; and (3) when dry gas tanks from different manufacturers were subjected to −20°C for 48 hours, some tanks were found to have decreased pressure and an increase in alcohol concentration. Some tanks exposed to freezing temperatures for an extended period may not produce the appropriate reading and as such precautions should be taken when shipping or storing dry gas tanks in cold temperatures.
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实际使用市售的压缩(干气体)酒精标准
摘要:加拿大批准的呼吸测试仪器要求使用酒精标准,以确保它们在测试时处于正确的工作状态。新一代呼吸测试仪器允许使用干气(压缩气罐中的乙醇和氮气)作为酒精标准。评估了三个方面:(1)随着储气罐的耗尽,酒精读数随时间的一致性;(2) Intox EC/IR II和Datamaster DMT在两个不同高度的高度补偿;以及(3)将干气罐暴露在运输或储存过程中可能遇到的天气条件下的影响。结果表明:(1)随着罐的排空,醇的浓度保持稳定;(2) 两种仪器都正确地补偿了由于海拔变化引起的大气压力变化;和(3)当来自不同制造商的干气罐在−20°C下放置48小时时,发现一些气罐的压力降低,酒精浓度增加。一些长期暴露在冷冻温度下的储罐可能不会产生适当的读数,因此,在低温下运输或储存干气罐时应采取预防措施。
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