BW Honeywell GasAlert Max XT II Confined Space Muti-Gas Monitor, XT-XWHM-Y-NA

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The GasAlert Max XT II is a great, feature-packed multi-gas detector, to protect you and your workers from explosive or toxic gases and vapors, no matter where you are working. Comes completely charged, calibrated, and ready to use out of the box.

Clearly displaying gas levels on the bright LCD screen, it constantly monitors these atmospheric gas levels:


  • H2S: 0-200 ppm (Measuring Range), 1 ppm resolution

  • CO: 0-1000 ppm (Measuring Range), 1 ppm resolution

  • O2: 0-30.0 percent (Measuring Range), 0.1 percent resolution

  • Combustible Gasses: 0-100 percent LEL (Measuring Range), 1 percent resolution

The XT II's motorized pump gives you flexibility by offering two modes of air sampling (active and diffusion), whereas the Quattro and the Micro Clip XT only offer diffusion detection.

The BW XT II utilizes an internal motorized pump to sample the air. This allows you or your team to check the atmosphere inside an enclosed space (hatch, tank, sewer etc) before entry.Protective gear (respirators, SCBA, gas masks etc.) can be in place and workers know what they are getting into prior to entry.

The pump features easily changed dust and particulate filters, as well as valves to prevent entry of water.

The diffusion mode can be activated, turning off the pump and saving on battery power

if you don’t need to use targeted gas detection. If you only need a diffusion gas sniffer, check the more basic GasAlert Quattro and GasAlert MicroClip detectors, also from BW Technologies by Honeywell.


  • Flammable, combustible and explosive gases will all be picked up, and should levels reach anything approaching dangerous the GasAlert will set off a warning alarm

  • Oxygen Detection: The O2 monitor will alert you should this vital gas reach low levels, or overly high levels that could result in combustion

  • Carbon Monoxide Detection: Colorless, odorless and a non-irritant, this dangerous gas arises from many different pieces of equipment: fireplaces, propane fueled equipment, heaters, generators, welding kits, etc.

  • Hydrogen Sulfide Detection: Toxic and flammable, H2S is an irritant that can cause respiratory failure if its presence goes undetected and the strong aroma of eggs is not detectable after prolonged exposure LEL Detection: Sampling for a broad range of potentially combustible gases helps prevent non-specific onsite build up of these compounds, which can come from a variety of work place materials

Three alarm modes are built right into the device to warn you about dangerously high levels, or extended, potentially harmful, exposure. Alerting you to Short/Long Term exposure, and high/low levels of the gases:

  • Visual Alarm: Three bright LED lights flash to alert you

  • Sonic alarm: A 94dB siren is built into the XT II

  • Vibration Alert

A confidence beep is also built-in to signal the all clear as you or your workers are working in the confined or potentially dangerous environments.

Key Features:

  • A bright, large LCD screen displays all the relevant gas level information and remaining battery levels, too

  • Sporting BW Technologies classic one-button operation, you can use all the main features of the device without needing much training at all - even while wearing gloves

  • The XT II gas sniffer is made for the real world work environment and has a concussion-proof boot to protect against falls and features IP-66/67 water-resistance

Optional Confined Space Kit Includes:

  • Durable foam-lined carrying case

  • sampling hose

  • Bump test kit

  • Sampling probe

  • IR Connectivity Kit

Also available is the BW Honeywell Vehicle Power Adapter, which is also sold separately and not included in the above kit.

Comes With:

  • Wall charger

  • Calibration certificate

  • Manual (in hard copy and DVD)

  • Screw driver

  • Five replacement particulate (thick) filters for the pump

  • Five replacement hydrophobic (thin) filters for the pump

  • One replacement filter for the end of the hose

  • One 3 ft. piece of clear hose with unit connector

  • One 10 ft. piece of clear hose with unit connector


  • Size: 5.1 x 2.8 x 2.0 inc.

  • Weight: 11.5 oz

  • Temperature: -4 to 122 degree F

  • Alarms: Visual/Audible

  • Typical battery Life: 13 hours at 32 degrees F/ 8 Hours at -4 degrees F / Recharges in 6 hours

  • Pump Draw: Sample pump from up to 75 ft.

  • Warranty: Full two-year warranty including all sensors

Remember to calibrate every six months and regularly perform bump tests.

FAQs: How Often Do I Need To Calibrate My Monitor?

Custom calibrations are available direct from PK Safety. If you need custom alarms for your BW GasAlert Max XT II, we have technicians that can customize these settings to your exact requirements without delaying your order. Volume discounts starting at 6 units. Call us at 1-800-829-9580 for details.

Product Manual: Gas Alert Max XT II Manual

Part Number:

More Information
Price $898.00
Weight 2.1200
Brand BW Honeywell
Type Multi-Gas
Gas Type %LEL, O2, H2S, CO
5th Sensor No
Color No
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  1. Mirbolat

    2013-12-30 21:58:28

    Hi! I'm having some problems with my BW Technologies GasAlert Max XT II. When the detector starts it fails the pump integrity test. What the problem and how I can to fix it? Thank you in advance!

    1 answer
    1. Ben Nicholson

      2013-12-30 21:58:28

      It sounds like there is a leak somewhere in between the pump inlet and the pump itself. First try replacing the filters if they are dirty the pump may be under too much strain. If replacing the filters doesn’t fix the problem it’s time to send the unit in for service. Here at PK Safety Supply we’re a factory authorized warranty repair center. Our typical turnaround time is just 24 hours and if the defect is covered under warranty it won’t cost you a penny! Please call today us to obtain an RMA.

  2. wade Moore

    2014-01-24 16:32:42

    Does the BW Honeywell Gas Alert Max XT II come with a hose and filter?

    1 answer
    1. Justin McCarter

      2014-01-24 16:32:42

      The GasAlert Max XT II comes with the following:<br>
      Wall charger<br>
      Calibration certificate<br>
      Manual (in hard copy and dvd)<br>
      Screw driver<br>
      5 replacement filters for the pump<br>
      One replacement filter for the end of the hose<br>
      One 3 ft. piece of clear hose with unit connector<br>
      One 10 ft. piece of clear hose with unit connector


    2014-05-05 15:58:34

    We purchased the Honeywell Micro-Clip unit, BW-01-mc2-xwhm-y-na, along with a calibration cylinder. Our customer has come back informing us that they need a regulator to connect the two devices. I could not find reference to one on your site. Do you have them, and if so, what is the part number and price?

    1 answer
    1. Justin

      2014-05-05 15:58:34

      The regulator needed is the <a href="">BW demand flow regulator</a>. Part number BW01-REG-DF-1. Current price is $360.00.

  4. Mike Brown

    2014-06-23 20:02:00

    Can the BW Honeywell GasAlert Max XT II Confined Space Monitor function with a hose longer than 10 feet for deeper manholes?

    1 answer
    1. Justin

      2014-06-23 20:02:00

      Yes. The maximum length of hose for the Max XT II is 65 ft. Using a longer hose, allow about a second per foot for the air sample to reach the monitor.

  5. uwaye

    2014-08-06 14:49:52

    After calibration, the oxygen keeps showing FAIL. I have tried several times. What do i do?

    1 answer
    1. Justin

      2014-08-06 14:49:52

      Most likely you need a new <a href="{{store direct_url="bw-quattro-replacement-oxygen-sensor.html"}}">Oxygen sensor</a>. If the monitor has been dropped or wet that would do it too. If the monitor is brand new it could be a manufacturing defect. 95% of the time a new sensor fixes the problem.

  6. Dennis Davirro

    2014-08-14 23:26:18

    Can the concussion holder for the Max II be purchased separately or is only available in the CS Kit?

    1 answer
    1. Chris

      2014-08-14 23:26:18

      We do have the GA-BXT concussion proof boot for the Max XT II available as a separate item. They are in stock.

  7. Urban

    2014-09-03 22:41:26

    Do you need a dilution tube to test an inert environment with the max XT II? The meters go to 0 and then stop working.

    1 answer
    1. Chris

      2014-09-03 22:41:26

      On start up, the CO, H2S and LEL sensors should be reading 0, with the O2 Sensor reading 20.9% in fresh air. The BW GasAlert Max XT II, with its internal sample draw pump, then pulls sample air across the sensors. The intended use for the instrument is in confined space entry, though other uses do come up regularly.
      The LEL (explosive gas) sensor in the Max XT II will not function in an inert environment, as it uses a catalytic bead sensor, which requires oxygen to function. If this is the use that you have in mind, you will need to use an IR (infra red) sensor to measure LEL. This type of combustible sensor does not require oxygen to make measurements.


    2014-11-21 21:53:17

    How long should the end of the clear hose remain in the area being tested for LEL,CO,H2S and O2 in order to get the most accurate reading?

    1 answer
    1. Chris

      2014-11-21 21:46:16

      The BW Honeywell GasAlert Max XT II has an internal sample draw pump. This diaphragm pump pulls air through clear Tygon tubing, usually supplied with the BW XT-CK-DL confined space kit. The rate of flow is approximately 1 foot per second. A 15 foot length of this hose would have about 15 seconds of lag before reaching the sensor. Once the sample arrives at the sensors, there is a reaction time to be considered. Industry standard is to measure the time it takes to achieve 90 percent of the final reading. This is expressed as T90, and in the case of the Max XT II, it is 35 seconds. The initial reading on the instrument will rise quite rapidly, but to get the full, true and accurate reading, we use T90. For our example of a 15 foot sampling hose, we could confidently predict 50 seconds for an ‘accurate’ reading. In practice, you should be very close to accurate in substantially less time.

  9. Josh

    2014-12-08 18:10:53

    I replaced a faulty O2 sensor and when I started the meter back up the screen is orange and no numbers are displayed. Did I disconnect something that would cause that?

    1 answer
    1. Chris

      2014-12-08 18:10:53

      It sounds like something did go wrong during the sensor swap. I suspect the screen came away from the main PCB at some point during the swap. There is a small, white, rectangular foam like piece that transfers the signal from the PC Board to the screen itself. It slots into an opening on the bottom of the screen and protrudes slightly. To the untrained eye it can easily be discarded as trash however it is needed. I suspect this piece has fallen out. <br><br>
      There are possibly a few other scenarios that may cause the same problem. I would be happy to talk you through the recommended steps. Please feel free to call us at 510-337-8880 for assistance. We’re a BW Warranty service center and will be happy to service your monitor if needed.

  10. jackline

    2015-02-27 22:50:06

    Hi, am having a problem with a gasalertmax xtII.The lcd screen keeps on flickering on and off.What could be the problem and how do i fix it.

    1 answer
    1. Chris

      2015-02-27 22:50:06

      There are only 2 parts that could be faulty inside the instrument. Either the screen is defective or the PC Board is damaged. If the unit is less than 2 years old it may be covered under the manufacturer’s warranty, exceptions are water damage or physical damage. I’ll be happy to check the serial number and confirm it’s still under warranty if you’re unsure. We’re a warranty service center here at PK Safety and can perform warranty repairs at no cost to you. In the even the unit isn’t covered under warranty we can provide you with and estimate to repair the monitor. When you’re ready to send the monitor please call us for and RMA number prior to shipping.

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