Product Description Item Number | 10106729MSA Altair 4X & 5X Replacement Oxygen Sensor Replace & repair your MSA Atlair 4X or 5X Multi-Gas detector with MSA's replacement Xcell (O2) Oxygen sensor. Need some DIY help changing a sensor or just some friendly technical help with repairing your instrument? Call customer service @ 1-800-949-7233. Gas: Oxygen Package: Single gas Range: 0-30% Vol O2 Resolution: 0.1% O2 Response Time (typ): t(90) <10 seconds Alarm Setpoint: Min 5% Vol/ Max 24% Vol Warranty: 3 years Advantages: Long life: >4-year life, more than 100% additional life than other lead-based sensors. False-alarm rejection: don't be fooled; XCell Sensors are immune to pressure spikes. Durable: when other sensors freeze, XCell Sensors keep working down to -40°C.