Methane gas flowmeter | Explosion proof grade requirements for natural gas flowmeter

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1. Calibration process for methane sensors in coal mines The core of the calibration process for methane sensors in coal mines is to strictly follow the "Coal Mine Safety Regulations" and AQ standards, use standard gas samples for comparison, and ensure the accuracy and reliability of sensor monitoring data. This is a key technical link to ensure mine safety.

1. Preparation before Calibration 1 Personnel and Qualifications: Calibration personnel must undergo specialized training and hold certification before taking up their posts. At least two people must work together. Tools and Materials: * Calibration Device: Portable methane detection alarm calibrator or equivalent standard gas flowmeter. *Standard gas sample: a methane standard gas with a clear concentration value, usually equipped with two types: 1.00% CH ₄ and 2.00% CH ₄. The standard gas sample certificate must be within its validity period. *Other tools: barometer, thermometer, stopwatch, screwdriver, air circuit connecting pipe, etc.

3. Safety confirmation: Check that the gas concentration within a 20 meter radius of the work site is less than 1.0%, and confirm that the ventilation is good and there is no explosion hazard.

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2. Core calibration steps (taking catalytic combustion sensors as an example) 1 Appearance and basic function inspection: Check whether the appearance of the sensor is intact, whether the display is normal, and whether the remote control calibration function is effective. 2. Clean the air chamber: Rinse the sensor air chamber with a rubber ball or clean air, and wait for the display value to stably return to zero. 3. Zero point calibration: * Use clean air or an air sample below 0.50% CH ₄ as the zero point gas. *

Inject the gas sample at a flow rate of 200mL/min. After the displayed value stabilizes, set the current value to "0.00%" through the remote control or internal menu. 4. Sensitivity (indication) calibration: * Transfer a standard gas sample of 1.00% or 2.00% CH ₄ to the sensor chamber at a constant flow rate of 200mL/min through the calibration device. *After the displayed value stabilizes (usually for more than 90 seconds), operate the instrument to enter calibration mode and adjust the current displayed value to be consistent with the concentration value of the standard gas sample. 5. Alarm function test: Introduce a standard gas sample with a concentration slightly higher than the alarm point (usually 1.00% CH ₄) to test whether the sound and light alarm function is normal and whether the alarm error is within ± 0.05%. 6. Power off function test (if available): Introduce a standard gas sample with a concentration higher than the power off point (usually 1.50% CH ₄) to test whether the sensor can emit a power off signal normally. Three jujube belt bending, calibration records and subsequent processing 1 Record data: Detailed record of calibration date, location, sensor number, standard gas sample concentration and number, pre calibration indication, post calibration indication, operator and other information, and sign and archive. Record retention period shall not be less than 2 years

2. Label pasting: Paste the calibration certificate in a prominent position on the sensor, indicating the validity period

3. Clean up the site: recycle all tools and equipment to ensure that there are no remnants on site. 4. Key Parameters and Cycle Requirements * Calibration Cycle: Calibration must be conducted at least once

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