High-purity nitrogen pressure transmitters need to be oil-free. According to the query of relevant public information, nitrogen is a high-purity gas. Any impurities may cause its purity to decrease, thereby affecting its use effect. Grease is a common impurity that can easily contaminate nitrogen. Therefore, when using high-purity When using a nitrogen pressure transmitter, oil-free materials need to be used to prevent grease from entering the gas circuit and affecting the purity of the nitrogen. When using a high-purity nitrogen pressure transmitter, the gas circuit needs to be cleaned and maintained regularly to ensure the high purity and stability of the nitrogen.