HEAT EXCHANGER WITH INNER SENSOR GRID AND RESTRAINTS FOR SENSOR WIRES AND HEAT EXCHANGE TUBES

A heat exchanger (108) includes a sensor grid (180) with sensor leads (184) extending through tube restraints (190) for heat exchange tubes (146) in the heat exchanger (108). The tube restraint (190) includes a body (192) having a plurality of tube openings (194) defined therein with each tube opening (194) receiving one of the set of heat exchange tubes (146) therethrough. The body (192) also includes a sensor lead opening (200) defined therein to receive a sensor lead (184) therethrough. Each tube opening (194) has a larger dimension than the sensor lead opening (200). The sensor grid (180) is installed during manufacture rather than in the field, allowing the sensor grid (180) to be on outermost and inner sets (176) of heat exchange tubes (146) in the heat exchanger (108).