Answer :
Final answer:
The first step in gas detector calibration is to purge the sensor with zero gas, ensuring residual gases do not affect the calibration. After purging, the span gas cylinder can be connected for accurate calibration. Proper sequence in calibration is vital for reliable readings.
Explanation:
First Step in Gas Detector Calibration
When calibrating a gas detector, the first crucial step is to purge the sensor with zero gas. This process ensures that any residual gases present in the sensor's measurement environment do not interfere with the calibration process.
Following this initial step, one would typically connect the span gas cylinder to the sensor to introduce a known concentration of gas for calibration. However, without first purging the sensor, any existing gases could lead to inaccurate calibration adjustments.
Calibration Process Overview
- Purge the sensor with zero gas - This clears the sensor of any background gases.
- Connect the span gas cylinder to the sensor - Introduces the calibration gas.
- Visually inspect the system - Ensures that there are no physical issues with the gas detector.
- Connect a digital multimeter to the transmitter - May be used to check electrical outputs after calibration.
It is essential to follow the correct sequence in calibration to ensure the accuracy and reliability of the gas detector readings.
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