Tender For supply of chlorine gas detector as per annexure i , so2 sulphur dioxide gas detector as per annexure i , lpg gas detector as per annexure i , carbon monoxide co gas detector as per annexure i , oxygen gas detector as per annexure i , hydrogen gas detector as per annexure i , ammonia gas detector as per annexure i , h2s monitor gas detector as per annexure i , spare batteries as per annexure i