When install the bimetallic thermometer need female adapter?

We all know the bimetallic thermometer is widely used, industrial equipment, pipelines, power plants, petrochemical industry, heating systems and Marine areas such as can be. Common bimetallic thermometer are radial type bimetal thermometer, axial type bimetal bimetal thermometer meter and universal type. And connect the bimetallic thermometer and the device under test way is threaded connection, card sets of connection and flange connection. So when install the bimetallic thermometer female adapter to need? In general, when the pipe joint on the original device is male connection, in order to match with the original joint, then you should use the nipple of the bimetallic thermometer. Actually this is what we call the threaded connection.