With built-in early warning system, Model XZR200 alerts operators to faults within unit. Analyzer's 3.3 Vdc logic output acts as heartbeat that enables operator to check health of sensor, preventing false oxygen measurements from causing loss of product or poor combustion. Offering 2 choices of probe length and 2 temperature ranges, analyzer measures percent oxygen to better than 1% of span, or 0.5% O2, with ranges of 0–25% and 0–100% available.