BW Multi as Detector With Smart Sample Pump

Overview

Pre-entry atmospheric testing for confined space work presents a specific challenge that diffusion-only detectors cannot fully address: the most critical measurement — confirming the space is safe before anyone enters — needs to happen before any worker is inside the space. A portable diffusion detector requires physical presence at the measurement point. When that measurement point is the bottom of a manhole, the interior of a storage vessel, or a section of ducting that cannot be safely accessed until atmospheric conditions are confirmed, the circular dependency is obvious and the workaround — sending someone in with a detector before the space is confirmed safe — defeats the purpose of the atmospheric test entirely.

The BW GasAlertMax XT II (part number BW-GAMXT-II) is Honeywell BW’s dedicated pump-equipped confined space detector, combining four-gas simultaneous monitoring of O2, LEL combustibles, CO, and H2S with an integrated motorised SmartSample pump capable of drawing atmospheric samples from up to 75 feet (23 metres) of sampling tube. This means a confined space supervisor can conduct a complete four-gas pre-entry atmospheric assessment from outside the entry point — tube lowered through the access opening, readings taken at the surface — before any worker descends. The SmartSample pump technology goes beyond basic pump functionality by incorporating a semiconductor pressure sensor that detects pump blockages and flow inconsistencies, alerting the operator when sampling integrity is compromised rather than allowing inaccurate readings from a partially blocked tube to go unnoticed.

Part of Honeywell BW’s GasAlert family and supplied by Alright Engineering Solutions Pte Ltd — Singapore-based authorised distributors of Honeywell BW gas detection equipment serving the maritime and industrial sectors across the Asia-Pacific region — the GasAlertMax XT II is fully compatible with the MicroDock II automated test and calibration system and Fleet Manager II software, placing it within the same fleet management ecosystem as the MicroClip XL. For organisations deploying both diffusion and pump-equipped detectors across a workforce, the shared MicroDock II compatibility means both instrument types can be managed, calibrated, and documented within a single fleet management platform.

Key Features

1. SmartSample Integrated Motorised Pump — Remote Sampling to 23 Metres

The GasAlertMax XT II’s defining capability is its integrated SmartSample motorised diaphragm pump, which draws a continuous gas sample through attached sampling tubing from up to 75 feet (23 metres) away from the detector. The diaphragm pump technology is selected for its reliability in real field conditions — resistant to liquid ingress through sampling tubing, consistent flow rate maintenance under varying back pressure from long tube runs, and durable enough for daily use without the maintenance requirements of more complex pump designs. The 23-metre sampling range covers the depth of the large majority of industrial confined spaces encountered in utilities, petrochemical, and construction work — including deep manholes, tank interiors, and below-grade vault spaces. The pump activates automatically on start-up and performs a self-test that confirms flow is established before readings are taken, ensuring the operator knows the pump is functioning correctly before relying on it for pre-entry data.

2. SmartSample Semiconductor Pressure Sensor — Blockage Detection

The semiconductor pressure sensor integrated into the SmartSample pump system continuously monitors the flow pressure within the sampling circuit. If the sampling tube becomes kinked, blocked with water or debris, or if the inlet becomes obstructed during sampling, the pressure sensor detects the flow anomaly and triggers a pump blockage alarm — alerting the operator that the current readings may not reflect actual conditions at the sampling point. This blockage detection capability is operationally significant: in a standard pump without pressure monitoring, a partially blocked tube may still pass some flow and display readings that appear plausible but are actually diluted or delayed measurements of the target atmosphere. The SmartSample pressure sensor eliminates this failure mode by flagging the blockage condition explicitly rather than allowing inaccurate data to be acted upon.

3. Simultaneous Four-Gas Detection — H2S, CO, O2, and LEL

The GasAlertMax XT II monitors all four standard confined space entry gases simultaneously, with detection ranges of 0–200 ppm for H2S, 0–1,000 ppm for CO, 0–30% VOL for O2, and 0–100% LEL for combustible gases (with a secondary 0–5.0% v/v range for flammable gas percentage). All four readings are displayed simultaneously on the continuous LCD, allowing the operator to assess the complete atmospheric picture at a single glance rather than cycling through individual gas readings during a pre-entry test. Alarm setpoints for all sensors are user-adjustable and are automatically displayed during instrument start-up — confirming the device is correctly configured for the site’s specific thresholds before each use. The alarm setpoints cover Low, High, STEL (Short-Term Exposure Limit), TWA (Time-Weighted Average), over-limit (OL), and low battery conditions.

4. Comprehensive Alarm System — Visual, Audible (95dB), and Vibrating

The GasAlertMax XT II activates three simultaneous alarm channels when any monitored gas reaches a preset threshold: bright wide-angle visual alarm bars visible from multiple directions, a 95dB audible alarm, and an internal vibrating alarm. The 95dB audible output exceeds the alarm level of many competing pump detectors in its class — relevant in outdoor construction and industrial environments where ambient noise levels can reach 80–85dB during active operations. The pump fault alarm adds a dedicated alert type for pump blockage and flow failure events, giving the operator a distinct alarm signal that is specifically associated with instrument function rather than gas concentration — allowing immediate differentiation between a gas hazard event and an instrument fault condition during the pre-entry procedure.

5. 13-Hour Battery Runtime — Full Shift Coverage in Cold Conditions

The GasAlertMax XT II is powered by a rechargeable lithium battery with a typical runtime of 13 hours at 0°C (32°F) and 8 hours at -20°C (-4°F). The pump motor’s power draw reduces battery life compared with diffusion-only detectors — this is the inherent trade-off of integrated pump technology — but the 13-hour runtime at normal operating temperatures provides full coverage for a standard industrial shift, and the 8-hour cold weather runtime maintains usable coverage for most shift patterns in cold environments. The battery recharges fully in 6 hours via the standard charging cradle. A confidence beep feature provides periodic audible confirmation that the instrument is powered and operating throughout the shift without requiring the operator to visually check the display.

6. IP66/67 Dual Ingress Protection Rating

The GasAlertMax XT II carries a dual IP66/67 ingress protection rating — fully dustproof and protected against both powerful water jets (IP66) and temporary water immersion up to 1 metre (IP67). The dual rating is particularly relevant for pump-equipped detectors, which have a sampling inlet that could potentially allow liquid ingress during field use. BW’s SmartSample pump design handles this through the combination of the diaphragm pump’s inherent liquid resistance and the pressure sensor’s ability to detect and alarm on flow anomalies caused by liquid in the sampling tube. The concussion-proof boot and drop-tested housing provide physical impact protection appropriate for the demanding handling conditions of active confined space entry operations.

7. MicroDock II Compatibility — Automated Pump Testing and Calibration

The GasAlertMax XT II is fully compatible with BW’s MicroDock II automatic test and calibration station, including the pump-specific testing functionality that verifies pump flow rate and blockage response during automated bump tests. This is operationally significant: a pump-equipped detector requires its pump to be tested as part of the calibration and bump test procedure, and a docking station that cannot test the pump provides only partial verification of instrument function. The MicroDock II’s compatibility with the GasAlertMax XT II covers both the gas sensor response verification and the pump functionality test — providing a complete instrument check in a single automated docking cycle. Fleet Manager II software connects to MicroDock II for centralised fleet management, calibration tracking, and compliance documentation across a deployed GasAlertMax XT II fleet.

8. Extensive User-Configurable Options

Beyond alarm setpoint adjustment, the GasAlertMax XT II offers a broad range of user-configurable options accessible through the instrument’s menu system: confidence beep interval, force calibration when overdue, safety sensor lock, sensor configuration, latching alarms, detector identification, safe display mode, low alarm acknowledge, calibration IR lock, language selection (English, French, German, Spanish, Portuguese), location selection, custom start-up message, force block test, confidence interval, force bump test when overdue, and datalog interval. This level of configurability allows the instrument to be customised to match the specific operational procedures, safety protocols, and regulatory requirements of each deployment environment — rather than being locked to a generic factory configuration that may not align with site-specific safety plans.

Technical Specifications

Model: BW GasAlertMax XT II (Part No: BW-GAMXT-II) — Honeywell BW Technologies, supplied by Alright Engineering Solutions Pte Ltd

Gases Monitored: H2S (0–200 ppm, res. 1 ppm) / CO (0–1,000 ppm, res. 1 ppm) / O2 (0–30.0% VOL, res. 0.1%) / Combustibles LEL (0–100% LEL, res. 1%; 0–5.0% v/v, res. 0.1%)

Sampling Method: Integrated motorised SmartSample diaphragm pump; natural diffusion also supported

Pump Sampling Range: Up to 75 ft / 23 metres of sampling tube

Display: Continuous LCD — simultaneous display of all four gas readings plus alarm and battery status

Battery: Rechargeable lithium; 13 hours typical at 0°C; 8 hours at -20°C

Charge Time: 6 hours

IP Rating: IP66/67

Alarm Types: Visual (wide-angle LED bars), audible (95dB), vibrating; alarm types: Low, High, STEL, TWA, OL, Low Battery, Pump fault

Alarm Setpoints: User-adjustable for all sensors; automatically displayed on start-up

Size: 5.1 × 2.8 × 2.0 in. / 13.1 × 7.0 × 5.2 cm

Weight: 11.5 oz. / 328g

Operating Temperature: -20°C to +50°C (-4°F to +122°F)

Operating Humidity: 10–100% RH (non-condensing)

Wireless Connectivity: IR connectivity (via IR link accessory); MicroDock II compatible

Data Logging: Standard event logging and data logging on-device; Fleet Manager II via MicroDock II

Languages: English, French, German, Spanish, Portuguese

Safety Approvals: Class I, Div. 1, Gr. A, B, C, D; IECEx: Ga Ex ia IIC T4; ATEX: II 1G Ga Ex ia IIC T4; Brazil: Ex ia IIC T4

Warranty: Full two years including all sensors

Benefits

The operational benefit of the GasAlertMax XT II’s pump sampling capability is the ability to conduct compliant four-gas pre-entry atmospheric testing without sending a worker into the unconfirmed space. In a formal confined space entry procedure, the pre-entry atmospheric test is a mandatory step before any entry is permitted. With a diffusion detector, this test requires either a worker entering to take the measurement — defeating the purpose of the test — or a long wait for gas to diffuse from the space to the detector held at the entry point. With the GasAlertMax XT II’s 23-metre pump range, the test is conducted correctly: tube lowered to the test depth, pump draws the sample, readings displayed at the surface, decision made before entry. This is the technically correct way to conduct a confined space atmospheric test, and the GasAlertMax XT II makes it straightforward to execute in practice.

The SmartSample pressure sensor blockage detection adds a layer of measurement confidence that basic pump detectors cannot provide. In wet, dirty, or debris-laden environments — exactly the conditions encountered in sewer work, tank cleaning, and drainage inspection — sampling tube blockage is a real operational risk. Without blockage detection, an operator using a basic pump detector may receive readings that appear normal but are actually from air drawn through a leaking tube connection rather than from the target location. The SmartSample pressure sensor flags this condition explicitly, ensuring the operator knows when to trust the readings and when to investigate the sampling setup before acting on the data.

The full two-year warranty covering all sensors — including the pump mechanism — provides a total cost of ownership assurance that is not universal across pump-equipped multi-gas detectors. Pump mechanisms add a serviceable component to the instrument that some manufacturers exclude from sensor warranty coverage. BW’s full two-year warranty covering all sensors removes uncertainty from the total cost calculation for organisations procuring the GasAlertMax XT II at scale.

For organisations already deploying the MicroClip XL for general personal monitoring alongside the GasAlertMax XT II for pump sampling, the shared MicroDock II and Fleet Manager II compatibility means both instrument types are managed within a single fleet platform — calibration scheduling, compliance documentation, alarm event records, and device assignment all maintained in one system regardless of which detector variant a worker is using on any given day.

Who It’s For

Confined Space Entry Supervisors and Atmosphere Testers in Utilities and Construction: If your role includes issuing confined space entry permits and conducting the mandatory pre-entry atmospheric test before workers descend into manholes, sewers, utility vaults, and below-grade infrastructure, the GasAlertMax XT II’s 23-metre pump range allows you to conduct that test correctly — from outside the space — without sending a worker in to take the measurement. The SmartSample blockage detection ensures the readings you rely on to issue or withhold an entry permit are from the actual atmosphere in the space, not from a compromised sampling pathway.

HSE Officers Managing Confined Space Entry Programmes in Petrochemical and Industrial Facilities: For facilities with formal permit-to-work systems requiring documented pre-entry atmospheric testing across multiple confined spaces on a daily basis, the GasAlertMax XT II’s MicroDock II compatibility and Fleet Manager II integration means every pre-entry test record, alarm event, calibration certificate, and bump test result is automatically logged and available for compliance documentation — without manual record-keeping from the atmosphere tester. This automated documentation capability directly supports COSHH, OSHA 1910.146, and equivalent confined space regulatory compliance reporting requirements.

Marine and Offshore HSE Teams — Enclosed Space Entry: On vessels and offshore platforms where enclosed space entry into cargo holds, ballast tanks, double-bottom tanks, and void spaces is a routine operational requirement, the GasAlertMax XT II provides the pump sampling capability needed to test tank atmospheres through small access openings without full entry — meeting the pre-entry testing requirements of SOLAS Chapter III, ISM Code guidance on enclosed space entry, and class society requirements for atmospheric testing before enclosed space entry permits are issued.

Possible Applications

Confined Space Entry Pre-Entry Atmospheric Testing — Primary Application: Remote four-gas atmospheric sampling through entry hatches, access covers, and valve openings at depths up to 23 metres — confirming O2, LEL, CO, and H2S conditions are within safe limits before an entry permit is issued and workers descend.

Sewer and Drainage Inspection: Pre-entry atmospheric assessment in sewers and drainage infrastructure where H2S from biological decomposition and methane (LEL) from organic matter accumulation are primary hazards — pump sampling allows the atmosphere at the bottom of a sewer run to be tested from the access point at the surface.

Storage Tank and Process Vessel Cleaning and Inspection: Remote sampling of tank and vessel interiors through nozzles, hatches, and inspection ports during cleaning preparation and maintenance scheduling — determining whether inert gas purging, ventilation, or other atmosphere management is required before a tank entry permit can be issued.

Marine Enclosed Space Entry — Cargo Holds, Ballast Tanks, Void Spaces: Pre-entry atmospheric testing on vessels where the pump allows sampling through small access openings in decks, bulkheads, and tank lids — avoiding the need to open large access hatches or partially enter the space to conduct the mandatory pre-entry atmospheric check.

Underground Pipeline Inspection and Maintenance: Atmospheric sampling inside pipeline sections, valve pits, and underground chambers through access ports and sampling connections before entry for inspection, maintenance, or repair work — covering combustible gas, H2S, CO, and O2 hazards from pipeline contents and confined space conditions.

Mining — Remote Sampling in Unventilated Headings: Pump sampling ahead of crew advance in underground mining drifts and headings where blasting residuals (CO, NOx), methane, and O2 deficiency may be present in areas that have not yet been ventilated — allowing atmospheric conditions to be assessed before workers enter the heading.

Fuel Storage Tank Inspection and Decommissioning: Remote atmospheric sampling inside fuel storage tanks (above-ground and underground) through measurement ports and gauge connections — assessing LEL, O2, and H2S conditions before entry for inspection, cleaning, or decommissioning work where hydrocarbon vapour and sludge H2S are the primary hazards.

Emergency Response — Hazmat and Post-Incident Assessment: Remote atmospheric sampling in structures, vehicles, and enclosed spaces with unknown atmospheric conditions following incidents involving gas release, fire, chemical spill, or structural collapse — allowing first responders to assess conditions from outside the immediate hazard zone before committing personnel to entry.

Trust and Certifications

Class I, Division 1, Groups A, B, C, D — North American Hazardous Area Approval: The GasAlertMax XT II is approved for Class I, Division 1 hazardous locations covering Gas Groups A through D — the most demanding North American hazardous area classification, covering the full range of flammable gases including hydrogen (Group A), ethylene (Group B), propane (Group C), and methane (Group D). This approval confirms the device is certified for use in locations where ignitable concentrations of flammable gases exist under normal operating conditions — not just under fault conditions.

IECEx Certification (Ga Ex ia IIC T4): The IECEx international certification confirms the GasAlertMax XT II is certified for use in Zone 0 explosive atmospheres — the most demanding zone classification, where explosive gas atmospheres are present continuously or for long periods. The Ex ia (intrinsic safety) protection concept and IIC gas group coverage (hydrogen and acetylene, in addition to all lower-group gases) provide the broadest possible hazardous area coverage. IECEx certification enables deployment across international project environments without additional regional certification in most jurisdictions.

ATEX Certification (II 1G Ga Ex ia IIC T4): European ATEX certification for Category 1G equipment — the highest ATEX category, suitable for use in Zone 0 areas. II 1G confirms the device is designed and certified for use even in the most hazardous continuous-presence explosive atmosphere zones across EU and UK installations.

IP66/67 Dual Rating: Dual ingress protection confirms the GasAlertMax XT II is fully dustproof, protected against powerful water jets (IP66), and protected against temporary water immersion to 1 metre depth (IP67) — providing the physical protection required for use in sewer environments, outdoor applications, and wash-down areas.

Full Two-Year Warranty — Including All Sensors: The GasAlertMax XT II’s two-year warranty covers all sensors as well as the instrument hardware — including the pump mechanism. This is a more comprehensive warranty than many pump-equipped multi-gas detectors offer, where pump components may be excluded from standard sensor and instrument warranty terms.

Honeywell BW Technologies: Part of Honeywell’s global safety products portfolio, BW Technologies is one of the world’s leading personal gas detection manufacturers with a decades-long track record across oil and gas, utilities, mining, fire services, and industrial markets globally. The GasAlert product line — of which the Max XT II is a core component — is deployed across hundreds of thousands of industrial and safety applications worldwide.

Alright Engineering Solutions Pte Ltd — Authorised Distributor: Alright Engineering Solutions is a Singapore-based engineering solutions company serving the maritime and industrial sectors across the Asia-Pacific region. As an authorised distributor of Honeywell BW gas detection equipment, Alright Engineering Solutions provides full product support including supply, technical consultation, sampling accessory sourcing, MicroDock II system supply, and after-sales service. Full product portfolio available through alrightes.com.

Accessories and Variants

Sampling Probe and Extension Tubing (up to 75ft / 23m): Standard sampling tubes for remote atmospheric testing — the primary accessory for the GasAlertMax XT II’s pump capability. Available in standard lengths; longer tube configurations support deeper confined space sampling down to 23 metres. Probe tip assembly available for directed sampling at specific locations within a space.

MicroDock II Automatic Test and Calibration Station: Automates bump testing and full calibration of the GasAlertMax XT II including pump function verification — generates calibration certificates and integrates with Fleet Manager II for centralised fleet documentation. Essential for organisations managing multiple GasAlertMax XT II units across a confined space entry programme.

Fleet Manager II Software: Free PC-based fleet management software for centralised tracking of calibration status, alarm event logging, device assignments, and compliance documentation across a deployed GasAlertMax XT II fleet — downloadable from Honeywell BW.

MicroDock II Module for GasAlertMax XT II: The specific MicroDock II module compatible with the GasAlertMax XT II’s form factor and pump port — required for automated docking station calibration of the pump-equipped variant.

Carrying Holster and Neck Strap: Wear options for the GasAlertMax XT II during active work — the holster positions the detector at the breathing zone without hampering mobility; the neck strap includes a safety release breakaway fitting. The short strap (15.2cm) and 4ft (1.2m) extension strap provide alternative attachment options to clothing and PPE.

Calibration Gas Cylinders (34L and 58L): Four-gas calibration mixtures covering H2S, CO, O2, and LEL for field bump testing and manual calibration of the GasAlertMax XT II. Regulator and calibration tubing also required for manual calibration without MicroDock II.

Vehicle Power Adapter: 12V vehicle charging adapter for maintaining battery levels during mobile field work between site visits.

IR Connectivity Kit: Infrared data link for PC connection — device configuration, data download, and firmware updates maintaining IP66/67 housing integrity.

Available Variants — GasAlertMax XT II Gas Configurations:

BW-GAMXT-II (O2, LEL, CO, H2S — this model): Standard four-gas confined space configuration

BW-GAMXT-II (O2, LEL, CO only): Three-gas variant without H2S sensor — for applications where H2S is not a relevant hazard

BW-GAMXT-II (O2, LEL, H2S only): Three-gas variant without CO sensor

Regional variants available — replace “-NA” suffix with “-EU” (Europe), “-UK” (United Kingdom), or “-AU” (Australia/China) as applicable; contact Alright Engineering Solutions to specify the correct regional variant for your procurement

Ready to Deploy the BW GasAlertMax XT II for Your Confined Space Programme?

Whether you are equipping a confined space entry team for the first time with a pump-capable four-gas monitor, upgrading from diffusion-only detectors to enable proper remote pre-entry sampling, or building out a managed fleet programme with MicroDock II automated calibration, the GasAlertMax XT II provides the pump capability, sensor coverage, and fleet management compatibility that a professionally run confined space safety programme requires.

To request a formal quotation, discuss sampling tube and accessory configurations, or get technical advice on MicroDock II setup and Fleet Manager II integration for your workforce, contact the Alright Engineering Solutions team directly. We supply the full GasAlertMax XT II ecosystem — detectors, sampling accessories, docking stations, calibration gas, and fleet management software — and can support the full deployment from initial specification through to commissioning and ongoing fleet maintenance.