The BW SR-X2V (part AAY80-390R-BW) is a genuine Honeywell BW Technologies replacement oxygen (O2) sensor for BW GasAlert multi-gas detectors. It is built on City Technology's 4OXV CiTiceL — an electrochemical oxygen cell — and reads O2 across the 0–30% range used by BW monitors. It replaces the earlier SR-X10-C1 and SR-X10 sensors and is sold at Industrial Safety Products with free shipping.

The BW SR-X2V O2 sensor fits Honeywell BW GasAlert monitors: GasAlert MaxXT II, MicroClip XT, MicroClip XL, Quattro, Micro 5 (including Micro 5 IR and Micro 5 PID), and GasAlert Extreme (GAXT-X-DL-2 and GAXT-DL-B-2 models). Because it is a model-specific replacement, confirm your monitor is one of these before ordering.

Yes. The SR-X2V is the current replacement oxygen (O2) sensor for both the older SR-X10-C1 and SR-X10 sensors in BW GasAlert monitors. If your BW detector previously used an SR-X10 or SR-X10-C1 O2 sensor, the SR-X2V (AAY80-390R-BW) is the correct drop-in successor.

The BW SR-X2V reads oxygen across the 0–30% range used by Honeywell BW GasAlert monitors, covering oxygen-deficient, normal (20.9% O2), and oxygen-enriched atmospheres. The underlying 4OXV CiTiceL cell has a specified measurement range of 1–25% vol O2 with a 30% vol maximum overload, and a T90 response time of under 15 seconds.

The 4OXV CiTiceL cell inside the BW SR-X2V has an expected operating life of at least 24 months (2 years) in air, per City Technology's datasheet. Its output drifts less than about 2% per month and typically under 5% over its full service life. Unopened, it has roughly a 6-month storage life in its original packaging, so it should be installed soon after purchase rather than stored long term.

The BW SR-X2V is an electrochemical oxygen sensor (a City Technology CiTiceL). Oxygen diffuses into the sealed cell and drives a chemical reaction that generates a small electrical current proportional to the O2 concentration; the BW GasAlert instrument converts that current into an oxygen reading (0–30%). It responds in under 15 seconds (T90) and requires no external power to sense.

The BW SR-X2V (4OXV CiTiceL) operates from -20 °C to +50 °C, has an ABS casing, and weighs under 16 g. It responds in under 15 seconds (T90) and is rated for a minimum 24-month operating life in air. Note that it is not suitable for continuous operation in CO2 concentrations above 25%. As with any life-safety sensor, perform a bump test before each use.

Replace the O2 sensor when it fails a bump test or calibration, reads inaccurately, or reaches the end of its life — City Technology rates the 4OXV cell for a minimum of 24 months in air. The SR-X2V (AAY80-390R-BW) is the genuine drop-in oxygen sensor for BW GasAlert MaxXT II, MicroClip XT/XL, Quattro, and Micro 5 monitors, and it ships free from Industrial Safety Products.

Yes. The SR-X2V is a genuine Honeywell BW Technologies oxygen (O2) sensor (part AAY80-390R-BW). It is available at Industrial Safety Products (industrialsafetyproducts.com), a Honeywell Platinum 2024 authorized partner, with free shipping. It is the correct O2 replacement sensor for BW GasAlert MaxXT II, MicroClip XT/XL, Quattro, and Micro 5 detectors.

Yes — they all refer to the same sensor. "SR-X2V" is BW's replacement part number, "AAY80-390R-BW" is the Honeywell ordering code, and the sensor is built on City Technology's 4OXV CiTiceL oxygen cell (base part AAY80-390), which is why the cell is marked "4OX(2) Oxygen Sensor / CiTiceL." Ordering any of these codes for a BW GasAlert monitor gets you the same electrochemical O2 sensor.