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BW GAXT-D-DL GasAlert Extreme Single Gas Detector, Nitrogen Dioxide (NO<sub>2</sub>), 0 to 100ppm-

Downloads: datasheet manual

BW GAXT-D-DL GasAlert Extreme Single Gas Detector, Nitrogen Dioxide (NO2), 0 to 100ppm

Model: GAXT-D-DL

For users who need a permanent use monitor with a real-time PPM display in a monitor that's lightweight, compact and easy-to-use form. Features include datalogging, wide range of tamperproof user options and multi-language display. Yellow Housing

Sale Price $374.46 USD
Regular Price $474.00 USD
Availability 3 to 4 Weeks


  • Continuous LCD shows real-time gas concentration with backlight in low light (auto and on demand) and in alarm (auto)
  • Peak value displayed on command (in ppm or % vol.)
  • Low, High, TWA and STEL alarms with adjustable setpoints
  • Internal vibrator alarm
  • Provides 95 dB tone and bright LED indication on alarm
  • Full-function self-test of sensor, battery and circuitry integrity
  • Plug-in replaceable sensor
  • Simple auto-zero and calibration procedure
  • Classified intrinsically safe by UL to US and Canadian standards; ATEX certified
  • Highly water-resistant with an IP-66/67 fully immersible design
  • EMI/RFI resistant housing
  • Built-in concussion-proof boot
  • Replaceable 3V camera battery provides up to 2 years of continuous operation
  • Comes complete with stainless steel alligator clip, test cap and hose, battery and instructions
  • Sampling rate is factory set at 5-second intervals or user settable from 1- to 60-second intervals
  • Storage capacity is over 1 month of data at 5-second intervals
  • Must buy GA-USB2 to be able to use the datalogging function


  • Measuring Range: 0-99.9 ppm
  • TWA Alarm: 2.0 ppm
  • STEL Alarm: 5.0 ppm
  • Low Alarm: 2.0 ppm
  • High Alarm: 5.0 ppm
  • Sensor: Plug -in electrochemical cell (temperature compensated)
  • Alarms: Visual: Flashing wide-angled alarm lens with 4 red LEDs, plus alarm LCD readout; Audible: Pulsing, high output siren, 95dB at 10” (0.25m); Vibrator: In sync with audible and visual alarms; Low battery, off warning and sensor fail indications; confidence beep every 5 seconds
  • Tests: Full function self-test on activation (auto) and continuous battery test (auto)
  • Display: Continuously displays displays gas concentration present in ppm or %; Alarm setpoints displayed on demand in ppm or %; Records and displays TWA, STEL and Peak in ppm or % on demand
  • Event Logging: Records and transmits up to 10 gas alarm events
  • Housing: Rugged composite material with integral concussion-proof boot
  • EMI/RFI: Complies with EMC directive 89/336/EEC
  • Ingress Protection: IP 66/67
  • Power Supply: 3V lithium battery
  • Battery Life: 2 years
  • Dimensions: 1.1 x 2.0 x 3.75" (28 x 50 x 95mm)
  • Weight: 2.9 oz (82g)

BW GasAlert Extreme Single Gas Detectors Series Specifications

GasAlert for Measuring Range Alarm Setpoints (Factory defaults are shown. Alarm levels are field-adjustable.) Relative Humidity
Operating Temperature
TWA Alarm STEL Alarm Low Alarm High Alarm
Hydrogen Sulfide (H2S) 0-100 ppm 10 ppm 15 ppm 10 ppm 15 ppm 15-90 -40 to +50 oC
-40 to +122 oF
Sulfur Dioxide (SO2) 0-100 ppm 2 ppm 5 ppm 2 ppm 5 ppm 15-90
Hydrogen Cyanide (HCN) 0-30.0 ppm 4.7 ppm 10.0 ppm 4.7 ppm 10.0 ppm 15-95
Carbon Monoxide (CO) 0-999 ppm 35 ppm 200 ppm 35 ppm 200 ppm 15-90 -30 to +50 oC
-22 to +122 oF
Chlorine (CI2) 0-50.0 ppm 0.5 ppm 1.0 ppm 0.5 ppm 1.0 ppm 10-95 -20 to +50 oC
-4 to +122 oF
Nitrogen Dioxide (NO2) 0-99.9 ppm 2.0 ppm 5.0 ppm 2.0 ppm 5.0 ppm 15-90
Ammonia (NH3) 0-100 ppm 25 ppm 35 ppm 25 ppm 50 ppm 15-90
Phosphine (PH3) 0-5.0 ppm 0.3 ppm 1.0 ppm 0.3 ppm 1.0 ppm 15-90
Ethylene Oxide (ETO) 0-100 ppm 1 ppm 5 ppm 1 ppm 5 ppm 15-90
Chlorine Dioxide (ClO2) 0-1 ppm 0.1 ppm 0.3 ppm 0.1 ppm 0.3 ppm 15-95
Ozone (O3) 0-1 ppm 0.1 ppm 0.1 ppm 0.1 ppm 0.2 ppm 15-90
Nitric Oxide (NO) 0-250 ppm 25 ppm 25 ppm 25 ppm 25 ppm 15-90
Oxygen (O2) 0-30.0% N/A N/A 19.5 % 22.5% 0-99

Full function self-test Full function self-test on activation (auto)
GENERAL SPECIFICATIONS Impact-resistant ABS enclosure
Humidity 5% to 95% RH (non-condensing) (15% to 90% non-condensing for PH3 and NH3)
EMI/RFI Complies with EMC Directive 89/336/EEC
Battery type 3-volt lithium (camera battery available locally)
Battery life 3 years (9,000 hours)
Size 1.1 x 2.0 x 3.75 inches / 28 x 50 x 95 mm
Weight 2.9 oz. / 83 g
Click here for complete specifications on the BW GAXT-D-DL

How to Select the Right Gas Detection Solution

by Don Galman

There are many gas detection products on the market that might appear to be the same, but a closer inspection of specification, functionality and features reveals major differences in what products can do and the potential value they can offer. Similarly, individual applications are also unique in their respective designs, needs and processes undertaken.

Know your site risks

Before beginning to consider gas detection equipment, a risk assessment needs to be conducted. Any company employing staff has the obligation to conduct risk assessments to identify potential hazards and these can include potential gas, vapor or Oxygen deficiency risks. If gas hazards are identified, gas detection is applicable as a risk reduction method.

Identifying the prime objective

Depending on the processes being undertaken and the gases being detected, remote or off-site alarm notification plus event data logging/reporting may also be required for Health and Safety management records. Another factor impacting on the need for enhanced reporting functions might be regulatory compliance or a condition of insurance.

Ask the right questions

Having identified the primary objective, the suitable equipment is selected by asking a number of key questions. These fall into three broad categories:

  • The gases to be detected and where they may come from
  • The location and environmental conditions where detection is to take place
  • The ease of use for operators and routine servicing personnel
Identify the gases to be detected and where they may come from

The gases to be detected should be identified by the risk assessment, however experienced gas detection equipment manufacturers and their approved distributors are often able to help in this process, based on their experience of similar applications. However, it is important to remember that it is the end-user’s responsibility to identify all potential hazards. It is also essential to identify the potential source of a gas release as this helps determine the number and location of detectors required for a fixed gas detection system.

Consider the environmental conditions

The performance, accuracy and reliability of any gas detection equipment will be affected by the environmental conditions it is subjected to. Temperature, humidity and pressure levels at the location all have a direct bearing on the type of equipment that should be selected. Additional factors such as potential variations resulting from a production process itself, diurnal/nocturnal fluctuations and seasonal changes may also affect the type of device which is suitable.

Understand product functionality

The next area of consideration relates to additional product functionality. Aspects like wiring configuration are important, especially when retro-fitting into an existing application. If the apparatus is being integrated into a separate safety system, certain communication protocols may also be required such as HART®, Lonworks or Modbus®. Consideration will also need to be given regarding the requirement for local displays on transmitter units and local configuration of the unit and gas displays may also be a useful addition.

Measure the ease of use for operators and routine servicing personnel

Routine maintenance is another important consideration. Some gases and vapors can be detected with a number of different sensing technologies, e.g. Hydrocarbon gases with catalytic beads or Non-dispersive Infrared NDIR. Catalytic beads do not provide fail-to-safety operation and therefore can require a high frequency of routine maintenance, however NDIR based solutions tend to have a higher initial purchase price, but may require less routine maintenance. In-house resource to undertake such routine maintenance needs to be identified and in the absence of such a resource, budgeting for third party maintenance is an important factor in selecting the right equipment.

Need Help Selecting the Right Solution?

If you have questions about any of our gas detection products or services, please don’t hesitate to contact us. Whether you need a hand finding a new product or need help with your current system, just ask our team of Factory Trained Experts.

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What's Included with the BW GasAlert Extreme Single Gas Detectors Series

  • Single Gas Detector
  • Test Cap and hose (1ft./0.3m)
  • Battery

GasAlert Extreme (GAXT) Expert Product Review:

The Good:

Small, compact, easy to use and available with a variety of toxic gas sensors to choose from. Real-time gas concentration readings are displayed on the LCD. It can be turned on and off at the beginning and end of your shift. Sensors and batteries can be replaced to extend unit life.

The Bad:

The unit's 3V battery, while having a long life span, is not easily field replaceable, requiring the unit to be opened completely in order to change the battery.

The Bottom Line:

With its range of user options and functionality, the GAXT is ideal for many applications where toxic gases are a concern. It has a good history of being reliable and virtually problem free.

Full Review:

A popular unit, the GasAlert Extreme is a good choice for anyone wanting continuous, reliable protection in a long-term single gas detector. It is a good fit in virtually any application where toxic gases are a concern, such as Oil & Gas, Utilities, Municipalities, Refineries, Steel Mills, Pulp, Paper and more.

Regular maintenance is required on this model in the form of frequent Calibrations and battery replacements. Bump Tests can also be performed on the unit depending on personal preference or when site safety regulations require it.

Available sensors include H2S, CO, SO2, PH3, Cl2, NH3, NO2, HCN, ETO, O3, NO and Oxygen, but as a single gas detector you can choose only one of those sensors available, not multiple sensors. The built-in concussion proof boot provides excellent protection against accidental bumps, scratches and damage; and it is water-proof, with an IP rating of 67 it can be submerged in water up to 1 m deep for 30 minutes.

The real-time gas concentration is displayed continuously on the LCD so you will always know the current levels, even when the unit is not in alarm. The unit has a built in Datalogging feature, enabling you to retrieve a detailed and accurate history of conditions and unit maintenance if needed.

Calibrating the unit is required every 90 days but is quick and easy to perform; the procedure can be done in the field and only takes about 2 minutes to perform, and all you will require is a cylinder of calibration gas and a regulator. It is also compatible with the BW MicroDock II calibration and bump test station for those who wish to use a more hands-free, automated, calibration and bump test procedure.

How to: Calibrate a BW Gas Detector

How to: Bump Test a BW Gas Detector

Meet Shauna Park: Our Gas Detection Expert

Click on a category to view a selection of compatible accessories with the BW GAXT-D-DL GasAlert Extreme Single Gas Detector, Nitrogen Dioxide (NO2), 0 to 100ppm.

Review the BW Technologies GAXT-D-DL

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