Abstract: A solid state multi-channel temperature responsive control system having thermocouples positioned to monitor the temperature at various process control locations. Each thermocouple generates an electrical sensor signal representing the monitored temperature at the corresponding control location. The sensor signal from each thermocouple is supplied to an associated channel of control circuitry which automatically compares the sensor signal with a manually adjustable set-point signal representing the desired temperature at the monitored control location. The sensor signal for any particular channel may be selectively displayed on a voltmeter calibrated in degrees of temperature, and the set-point signal for the selected channel may be displayed on the same meter to facilitate adjustment thereof. The comparison circuitry in each channel generates a difference signal reflecting variation of the monitored temperature from its set-point value.