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Difficulty: MediumSequential Steps and Chronology

Protocol for the Decontamination and Calibration of Estuary Sensors:

Before initiating the field deployment, the operator must execute the following sequence:
First, rinse the sensor housing with deionized water to remove residual saline crusts. Immediately following this rinse, calibrate the salinity sensor using a certified 35 ppt standard solution. Once calibration is complete, the operator must dry the external casing with a lint-free wipe. Prior to submerging the sensor array into the estuary flow, it is mandatory to log the calibration parameters in the database. Finally, verify that the protective copper mesh is secured to prevent biofouling.

Based on the provided sensor maintenance protocol, which action should the technician complete immediately after calibrating the salinity sensor and prior to logging the calibration parameters in the database?

  1. A
    Log the calibration parameters in the database.
  2. Dry the external casing of the sensor array with a lint-free wipe.Answer
  3. C
    Rinse the sensor housing with deionized water to remove residual saline crusts.
  4. D
    Submerge the sensor array in the estuary flow.

Answer

Dry the external casing of the sensor array with a lint-free wipe.
The protocol specifies that immediately after calibrating the salinity sensor ('Once calibration is complete'), the operator must dry the external casing with a lint-free wipe. This action must be done before logging the calibration parameters, which is designated as a prerequisite to submerging the sensor array.

Step-by-Step Solution

1
Identify the two landmark events mentioned in the question: calibrating the salinity sensor and logging the calibration parameters.
The text states: '...calibrate the salinity sensor... Once calibration is complete, the operator must dry the external casing... Prior to submerging... log the calibration parameters...'
Establishes the boundaries of the chronological window we need to analyze.
2
Trace the actions described between those two landmarks.
The sentence following calibration is 'Once calibration is complete, the operator must dry the external casing with a lint-free wipe.' The sentence following that is 'Prior to submerging the sensor array... log the calibration parameters...'
Pinpoints the specific action occurring chronologically between calibration and logging.
3
Select the option that corresponds to this intermediate action.
Drying the external casing with a lint-free wipe is the correct intermediate action.
Directly answers the question about the sequence of events.

Key Concept

Identifying step sequencing and chronological order in instructions and guides
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Topics

Sequential Steps and Chronology

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