sec.227Portable gas detectors

### sec.227 Portable gas detectors The site senior executive for an underground mine must ensure— the mine has a sufficient number of portable gas detectors capable of detecting the presence of methane, carbon monoxide and oxygen in the mine atmosphere; and each portable gas detector used at the mine is certified as— suitable for use in an underground mine; and having the following explosion protection category— for parts of the detector other than the gas detector head—Ex ia; for the gas detector head—Ex ia or Ex s; and capable of detecting the type of gas for which the detector is intended to be used; and being accurate and reliable. - (a) the mine has a sufficient number of portable gas detectors capable of detecting the presence of methane, carbon monoxide and oxygen in the mine atmosphere; and - (b) each portable gas detector used at the mine is certified as— (i) suitable for use in an underground mine; and (ii) having the following explosion protection category— (A) for parts of the detector other than the gas detector head—Ex ia; (B) for the gas detector head—Ex ia or Ex s; and (iii) capable of detecting the type of gas for which the detector is intended to be used; and (iv) being accurate and reliable. - (i) suitable for use in an underground mine; and - (ii) having the following explosion protection category— (A) for parts of the detector other than the gas detector head—Ex ia; (B) for the gas detector head—Ex ia or Ex s; and - (A) for parts of the detector other than the gas detector head—Ex ia; - (B) for the gas detector head—Ex ia or Ex s; and - (iii) capable of detecting the type of gas for which the detector is intended to be used; and - (iv) being accurate and reliable. - (i) suitable for use in an underground mine; and - (ii) having the following explosion protection category— (A) for parts of the detector other than the gas detector head—Ex ia; (B) for the gas detector head—Ex ia or Ex s; and - (A) for parts of the detector other than the gas detector head—Ex ia; - (B) for the gas detector head—Ex ia or Ex s; and - (iii) capable of detecting the type of gas for which the detector is intended to be used; and - (iv) being accurate and reliable. - (A) for parts of the detector other than the gas detector head—Ex ia; - (B) for the gas detector head—Ex ia or Ex s; and