Question 740Deck Safety70% to pass
You are using an oxygen indicator. How long should you wait after the sample is drawn into the instrument before reading the meter?
AI Explanation
The correct answer is B) At least 10 seconds.
When using an oxygen indicator, you need to allow the sample time to stabilize within the instrument before taking the reading. This is because the oxygen content in the sample may change over time due to factors like temperature and pressure. Waiting at least 10 seconds ensures the reading is accurate and representative of the actual oxygen level in the sample.
The other options are incorrect because 5 seconds is not long enough for the sample to fully stabilize (A), and 20 seconds is unnecessarily long (D). Option C, which states no wait is necessary, is incorrect because some wait time is required for the instrument to process the sample and provide an accurate reading.
Related Questions
#738 After each reading of an oxygen indicator, the instrument should be purged with _______________.#739 When using the oxygen indicator, which reaction from the needle should you expect as a sample is drawn into the instrument? #741 If the meter needle of the oxygen indicator cannot be set to zero, what should be done? #742 What is used to test a tank for oxygen content? #743 Combustible gas indicators operate by drawing an air sample into the instrument _______________.