Do I need to buy a converter head when I buy a collector?

No need. The collector is a kind of automation equipment with on-site real-time data collection and processing function, the equipment has wireless transmission function, can upload the collected information to the observation instrument through wireless network, it is not necessary to convert the intermediate instrument, so there is no need to buy the converter. The converter is a device that converts one signal into another, which can link the two types of instruments.