Sensor replacement valve

A fluid control system may comprise a pressurized fluid path; at least two sensors for determining a state of fluid within the main fluid path; an isolation valve; and fluid-filled connection paths between the main fluid path and each of the at least two sensors. The connection paths may comprise first sensing tubes connected between the main fluid path and the isolation valve; the isolation valve; and second sensing tubes connected between the isolation valve and the at least two sensors. Upon closure of the isolation valve, the connection paths may be interrupted so that the sensors may be isolated from the main fluid path and so that they may be removed from the system without a need to de-pressurize or drain the fluid from the main fluid path of the system.