The market supply of quantitative gas leak detectors can be roughly divided into two categories: one is leak detection devices that only provide qualitative alarms, relying on audible and visual signals to indicate "there is a leak" but unable to give a leak rate value; the other is instruments with quantitative scales that can read leak rates on the order of grams per year against range-specific standard curves. For organizations responsible for SF6 equipment handover acceptance, periodic maintenance, or gas recovery operations, the key to procurement decisions is not the number of functional items, but whether the measured data can be directly used to determine whether the equipment exceeds the allowable leakage limit. The DRD-6200 belongs to the latter category, and the following explanation is developed from several comparable dimensions.
Qualitative leak detectors increase alarm frequency when the probe approaches a leak point, but operators can only judge "leaking" or "not leaking," and subsequent estimation of leakage volume often requires additional auxiliary equipment such as flow meters and collection bags, involving many steps and many sources of error. The DRD-6200 adopts a range-based detection method, switching to the corresponding range for different leak rate ranges and reading quantitative results with reference to the standard curve for that range, making on-site readings comparable. Its accuracy is 3 g/year, and the sensitivity when the sensor is stationary is also 3 g/year, with instantaneous response time, 1-second reset time, and about 2-second warm-up; the interval from power-on to readable values is short, making it suitable for the pace of multi-point rotation detection at maintenance sites.
The instrument uses a handheld probe, with the detection length designed for handheld operation, making it convenient for point-by-point scanning in confined locations such as switchgear bays and near GIS flange surfaces. The indication method is digital display combined with audible and visual signals, presenting readings and alarm prompts simultaneously. Power is supplied by a rechargeable nickel-metal hydride battery, supporting dual AC/battery use, with a continuous operating time of about 5 hours and a battery life of about 30 hours under normal use conditions, basically covering the detection needs of one maintenance shift; when there is no reliable power source on site, the battery can also be relied upon to complete the work. The operating ambient temperature range is 0 to 52°C, allowing normal use under the conventional working conditions of most outdoor substations and indoor distribution rooms. In contrast, some desktop devices that only support AC power supply require additional mobile power sources at workstations without power, adding an extra step in work organization.
The DRD-6200 is suitable for airtightness inspection of SF6 gas-insulated equipment, leak retesting after equipment maintenance, and leak point location and quantitative recording during gas recovery and filling. During procurement, comparisons can be made based on three items: detection frequency, whether quantitative data need to be retained, and on-site power conditions. For scenarios focused on qualitative screening with limited budgets, qualitative leak detectors can meet basic requirements; for scenarios requiring issuance of leak rate data, participation in handover acceptance, or comparison with historical records, models with range calibration and quantitative reading capability should be given priority. The instrument's accuracy specification is 3 g/year, and during selection it should be confirmed that its measurement range covers the allowable leakage limit range of the organization's equipment.
