More properly known as the Bayonet-Neill-Concelman connector, the BNC connector is one of several radio frequency connectors on the market today. The name of the connector is derived from a combination of two things:

1. the connecting technology employed; and
2. the names of the two inventors of the device.

Paul Neill of Bell Labs and Carl Concelman sought to develop a connector that would employ a bayonet mount mechanism for locking. The two men perfected an earlier design and created this small connector that has been used for a number of applications over the last several decades.

Many Warner devices require a BNC connector, including recorder outputs on temperature controllers, the sensor input on the overflow sensor system, the TA-29 cable that connects to the rear panel of the TC-324/344B temperature controller, external digital signal inputs on the front panel of the valve control systems, and many others.

To fasten a BNC connector, push in and turn clockwise. To unfasten, push and turn counter-clockwise. A typical BNC connector is shown below.