All TEMPERATURE SENSORS FOR NX3100 / NX4100 / NX5100 / NX6100 ManufacturersSelect Manufacturer…FireyeHoneywellPyromationSiemens Fireye NX1040‐1 Boiler Temperature Sensor NX1040‐1 Boiler Temperature Sensor with self test feature: 32 – 302 F, 0 – 150 C, 6″ length, 1/4″ dia., thermowell required, not provided. Fireye NX1044‐1 Boiler Temperature Sensor NX1044‐1 Boiler Temperature Sensor with self test feature: 32 – 752 F, 0 – 400 C, 6″ length, 1/4″ dia., thermowell required, not provided.