The determination of whether the hydrogen sulfide detector meets the standards is mainly based on the national standards GB/T18265-2019 and GBZ2.1-2019. Specific judgments can be made from the following aspects:

1. Alarm value settingAccording to GB/T18265-2019 and GBZ2.1-2019, the alarm value for hydrogen sulfide needs to be set around a time weighted average allowable concentration (TWA) of 4.3ppm and a short-term exposure allowable concentration (STEL) of 7.1ppm. In different scenarios, the alarm value should be fine tuned according to the risk characteristics. For example, in general industrial workshops, the first level alarm value is set at 80% (3.4ppm) of the TWA limit, and the second level alarm value is set at 80% (5.7ppm) of the STEL limit.

2. Calibration standardsThe calibration cycle of hydrogen sulfide detector shall not exceed 3 months. Before calibration, it is necessary to confirm that the concentration error of the standard gas is ≤± 1%, and select a standard gas that covers the daily alarm value range (such as 2ppm, 5ppm, 8ppm). During the calibration process, it is necessary to follow the process of introducing zero gas, sequentially introducing standard gas, and recording the displayed values to calculate the display error and ensure that the error is ≤ ± 5%. After calibration, records must be kept for no less than 12 months, including calibration date, standard gas information, indication error, etc.

3. Avoid false positives and false negativesEnsure that the detector can accurately respond at different concentrations, avoiding false alarms or omissions caused by improper selection of standard gases or non-standard calibration processes.

4. Compliance checkEnterprises should strictly comply with the relevant provisions of GB/T18265-2019 and GBZ2.1-2019 to avoid safety hazards caused by parameter settings that do not meet the requirements of the scenario. For example, a coal mine was fined 3 for violating equipment parameters by setting the secondary alarm value to 8ppm (higher than the STEL limit of 7.1ppm).

In summary, to determine whether the hydrogen sulfide detector meets the standard, it is necessary to comprehensively consider multiple aspects such as alarm value setting, calibration standards, avoiding false alarms and omissions, and compliance checks.