Which condition must be true for the liquid level to be acceptable for an initial reading?

For an initial reading, it is essential that the foam on the liquid does not exceed 2 full percent divisions. This ensures that the measurement obtained is accurate and reliable. Excessive foam can lead to inaccuracies, as it may affect how the liquid level is detected or evaluated. By keeping the foam within this specified limit, operators can ensure that their readings reflect the true liquid level in the container, thereby adhering to measurement standards and protocols vital for accurate data analysis and reporting.

In various measurement practices, strict guidelines are established concerning the allowable foam levels when taking initial readings. This is crucial to avoid potential discrepancies that could arise if the foam interferes with the detection methods used or if the liquid level reflects miscalibrated readings due to foam displacement. Hence, maintaining the foam below two full percent divisions is critical for the integrity of the measurement process.