An RFID chip including various types of data is mounted on a liquid syringe. A chemical liquid injector obtains various types of data from the RFID chip to perform a predetermined operation in accordance with at least some of the various types of data. For, example, a variable pattern for liquid can be recorded on the RFID chip of the liquid syringe to allow the chemical liquid injector to inject the liquid in accordance with the predetermined variable pattern. Thus, a large amount of data can be easily input into the chemical liquid injector to perform the various operations.
