Direct measuring methods
Article 6
1. To identify leakage, certified personnel shall use one or more of the following direct measuring methods: (a) check of circuits and components representing a risk of leakage with gas detection devices adapted to the refrigerant in the system; (b) application of ultraviolet (UV) detection fluid or suitable dye in the circuit; (c) proprietary bubble solutions/soapsuds. 2. Gas detection devices referred to in paragraph 1(a) shall be checked every 12 months to ensure their proper functioning. The sensitivity of portable gas detection devices shall be at least five grams per year. 3. The application of UV detection fluid or suitable dye in the refrigeration circuit shall only be undertaken if the manufacturer of the equipment has approved that such detection methods are technically possible. The method shall only be undertaken by personnel certified to undertake activities which entail breaking into the refrigeration circuit containing fluorinated greenhouse gases. 4. Where the methods specified in paragraph 1 of this Article do not identify a leakage and the parts referred to in Article 4 show no sign of leakage, and the certified personnel deems that there is a leak, he shall inspect other parts of the equipment. 5. Prior to pressure testing with Oxygen-Free-Nitrogen (OFN) or another suitable pressure testing gas to check for leakage, fluorinated greenhouse gases shall be recovered from the whole system by personnel certified to recover fluorinated greenhouse gases from the specific type of equipment.