Things are ticking along as expected at sensor technology firm Halma in the second half of its financial year.Revenue in the first six months of the year was 12% ahead of 2009/10 and this trend has continued into the first four months of the second-half of the financial year. The relative performance of the group's trading divisions and regional sectors has also continued along the same path seen in the first half of the financial year. Infrastructure Sensors is achieving "solid results", while the Health ad Analysis division is growing strongly and Industrial Safety is delivering improved profitability.As expected, the company is seeing fastest growth in emerging economies. Recently acquired business Alicat Scientific and Accudynamics are both trading in line with expectations.The board of Halma believes current market forecasts for underlying pre-tax profit to be in the range of £100m to £106.4m with a consensus of £102.7m, and said the company is on track to meet these expectations.