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Overview
Gas leaks in HVAC systems, refrigeration circuits, and combustible gas installations rarely announce themselves loudly. A slow refrigerant seep from a brazed joint, a minor LPG leak at a regulator fitting, or a combustible gas accumulation behind a false ceiling can go undetected for weeks using visual inspection alone — until concentrations reach a level where they become a health risk, a fire hazard, or a regulatory compliance problem. The challenge isn’t knowing that leaks happen; it’s finding them quickly, accurately, and in locations that are difficult to access with a standard handheld instrument.
The BH-90E Portable Gas Leakage Detector is a professional handheld probe instrument designed specifically for that task. With a flexible extended probe that positions the sensor tip precisely at pipe joints, valve connections, brazed fittings, and enclosed equipment cavities, the BH-90E allows technicians to locate combustible gas and refrigerant leaks at the source — not just confirm their general presence in an area. It detects EX gases across a 0–10,000 mol/mol range and supports refrigerant gas combinations including Freon variants, making it one of the more versatile leak detection instruments available in this class.
What differentiates the BH-90E from basic leak testers in this category is the combination of four simultaneous alarm methods — sound, light, vibration, and on-screen display — in a compact 300g instrument with an 8-hour continuous working time. For HVAC engineers, refrigeration technicians, gas installation contractors, and industrial maintenance teams who need a reliable, professional-grade leak detector for daily use, the BH-90E provides practical performance that goes beyond the capabilities of entry-level alternatives. A colour screen variant (model K-100EX) is also available for technicians who prefer enhanced display clarity in varied lighting conditions.
Key Features
Extended Flexible Probe for Precise Leak Location
The BH-90E’s extended flexible probe is the feature that most directly determines how useful the instrument is in real-world leak detection. It allows technicians to position the sensor tip at specific leak points — behind panels, under equipment, at pipe joints in tight spaces, and around fittings that a rigid handheld body cannot reach. In refrigeration servicing and gas installation work, getting the sensor physically to the suspected leak location is what separates a useful leak detector from one that simply confirms atmospheric contamination somewhere nearby.
Four Simultaneous Alarm Methods
When gas is detected, the BH-90E triggers all four alarm channels simultaneously: an audible sound alarm, LED light alert, vibration alert, and on-screen concentration display. In the varied environments where gas leak detection is carried out — noisy plant rooms, outdoor locations, confined roof spaces, busy commercial kitchen extract systems — a single alarm channel will be missed in some conditions. The four-channel system ensures the detection alert reaches the technician regardless of the operating environment, and the on-screen display provides a concentration reading rather than just a presence indication.
Combustible Gas and Freon Detection — EX Gas Combination Support
The BH-90E supports EX gas detection across a 0–10,000 mol/mol range and is compatible with refrigerant gas combinations including Freon variants. For HVAC and refrigeration technicians who work across both combustible gas systems and refrigerant circuits, a single instrument that handles both detection requirements eliminates the need to carry separate dedicated instruments for each application — a practical time and cost saving for engineers working across multiple system types in a single day.
8-Hour Continuous Working Time
A 2800mAh lithium battery provides a minimum 8-hour continuous working time — covering a full inspection shift from a single charge with a 4–6 hour recharge time. For HVAC engineers and inspection contractors covering multiple sites in a working day, the 8-hour runtime removes battery management as an operational constraint. The instrument is ready for a full day’s work after an overnight charge without requiring mid-day top-up charging.
On-Screen Concentration Display
The instrument provides a direct on-screen concentration reading rather than just an alarm indicator. In professional inspection work, knowing the actual concentration level at a leak point — rather than just that gas is present — provides information that is useful for leak severity assessment, documentation, and repair prioritisation. The BH-90E black and white screen version provides clear readability in standard lighting conditions; the K-100EX colour screen variant provides enhanced display clarity across a broader range of ambient lighting environments.
Compact and Lightweight — 300g
At approximately 300g and 211x65x30mm, the BH-90E is light enough for extended use during a full inspection shift without causing hand fatigue. For engineers who carry the instrument throughout a working day across multiple sites and equipment inspections, the combination of extended probe reach and a compact, balanced body makes it practical for sustained professional use in a way that heavier, bulkier instruments are not.
2-Year Sensor Life
The sensor is rated for a 2-year operational lifespan under normal usage conditions. For businesses budgeting instrument maintenance costs, a defined sensor life makes replacement planning straightforward and avoids unexpected instrument downtime. The sensor replacement cycle is a known cost that can be factored into annual equipment maintenance budgets.
Technical Specifications
Model: BH-90E (black and white screen) / K-100EX (colour screen)
Target Gas: EX (combustible gases, Freon/refrigerant combinations)
Detection Range: 0–10,000 mol/mol
Weight: Approximately 300g
Dimensions: 211 x 65 x 30mm
Alarm Methods: Sound, Light, Vibration, Display (4 simultaneous)
Response Time: T90 < 60 seconds
Sensor Life: 2 years (subject to usage environment)
Working Time: ≥ 8 hours continuously
Charging Time: 4–6 hours
Voltage: DC 3.7V
Battery: 2800mAh lithium battery
Working Temperature: -10°C to 50°C
Humidity Range: ≤ 95% RH (non-condensing)
Benefits
Precise leak location rather than general area detection. The extended flexible probe allows the sensor to be positioned at the actual leak source — joint, fitting, valve, or connector — rather than simply detecting gas in the general vicinity. This speeds up leak location, reduces investigation time on site, and gives technicians the confidence that they have identified the specific failure point rather than an approximation of it.
One instrument covers combustible gas and refrigerant detection. For HVAC and refrigeration engineers working across both gas-fired equipment and refrigerant circuits, the BH-90E’s compatibility with EX gases and Freon combinations eliminates the need to carry separate instruments for each application type — saving equipment cost, reducing kit weight, and simplifying the inspection workflow across mixed-system sites.
Four alarm channels ensure the alert is always received. In the practical conditions of real-world leak detection work — noisy plant rooms, outdoor inspections in wind, confined roof spaces — a single-channel alarm will be missed in some scenarios. The BH-90E’s simultaneous sound, light, vibration, and display alerts remove that risk, ensuring the detection is communicated to the technician regardless of ambient conditions.
Full-day operation from a single overnight charge. The 8-hour working time covers a complete inspection day without mid-shift recharging. For inspection contractors who move between client sites throughout the day, this removes battery anxiety as an operational consideration and keeps the focus on the inspection work.
Colour screen option for enhanced display readability. The K-100EX colour screen variant provides improved display clarity in challenging lighting conditions — bright outdoor environments, dark confined spaces — where a standard monochrome display may be harder to read quickly. For technicians who regularly work across varied lighting environments, the colour screen option is worth specifying.
Who It’s For
The HVAC and Refrigeration Engineer Conducting Leak Surveys
You service commercial and industrial refrigeration systems, chillers, and air conditioning units — and gas leak detection is a regular part of your work. You need an instrument with a probe long enough to reach brazed joints inside equipment cabinets, a sensor that handles both combustible gases and refrigerant types, and an alarm system that works in noisy plant rooms. The BH-90E’s extended flexible probe, Freon compatibility, and four-alarm system address all three of those requirements in a single 300g instrument.
The Gas Installation and Maintenance Contractor
You install and maintain gas supply systems across commercial and industrial premises — boilers, process gas lines, LPG systems, and gas-fired equipment. After installation or repair, you need a reliable instrument to verify system tightness and locate any residual leaks before handover. The BH-90E’s 8-hour working time and four alarm methods make it a practical daily carry instrument across a multi-site working day.
The Facilities Maintenance Manager Overseeing Multi-System Gas Infrastructure
You’re responsible for the integrity of gas systems across a commercial or industrial property — including both combustible gas supplies and refrigerant-based HVAC and cooling systems. You need one instrument your maintenance team can use for routine inspection across both system types, rather than managing separate instruments for each application. The BH-90E’s combined EX and Freon detection capability makes it the practical choice for that mixed-system maintenance requirement.
Possible Applications
- Commercial refrigeration servicing — Leak detection in supermarket display cases, cold rooms, food service refrigeration, and commercial ice systems
- HVAC and air conditioning maintenance — Refrigerant leak surveys on split systems, chillers, VRF systems, and packaged air conditioning units
- LPG and natural gas installation verification — Post-installation tightness testing and leak surveys on gas supply pipework, regulators, and appliance connections
- Industrial refrigeration plants — Leak detection in large-scale ammonia and HFC refrigeration systems in food processing, logistics, and industrial cooling applications
- Commercial kitchen gas systems — Inspection of gas supply connections to commercial cooking equipment, flexible hoses, and manifold systems
- Automotive refrigerant servicing — Vehicle air conditioning system leak detection for automotive workshops and fleet maintenance operations
- Building services and mechanical plant rooms — Gas leak surveys on boiler plant, mechanical services pipework, and building gas infrastructure
- Industrial process gas systems — Leak detection on compressed gas supply lines, specialty gas manifolds, and process equipment gas connections
Trust and Certifications
Dual Model Availability — BH-90E and K-100EX
The BH-90E (black and white screen) and K-100EX (colour screen) provide two specification options to match different user requirements and working environments. The colour screen K-100EX is particularly suited to technicians who regularly work in varied lighting conditions where display readability is a practical consideration. Both variants share the same core detection capability and alarm system.
2-Year Sensor Life — Defined Replacement Cycle
A clearly defined 2-year sensor life (subject to usage environment) allows organisations to plan sensor replacement as a scheduled maintenance activity rather than a reactive cost. For businesses managing instrument maintenance budgets, this predictability is a practical advantage over instruments with undefined or highly variable sensor lifespans.
EX Gas and Freon Combination Support — Verified Compatibility
The BH-90E’s compatibility with EX combustible gas categories and refrigerant gas combinations including Freon variants is verified by the manufacturer. For HVAC and refrigeration engineers, this verified compatibility removes uncertainty about whether the instrument will reliably detect the specific refrigerants used in the systems they service.
Authorised by Alright Engineering Solutions
The BH-90E is supplied through Alright Engineering Solutions Pte. Ltd., an authorised distributor of personal and portable gas detection equipment in Singapore. As a specialist gas detection supplier, Alright Engineering Solutions provides local procurement support, technical guidance, and after-sales assistance for the Singapore and regional market.
Accessories and Variants
Extended Flexible Probe (Included)
The extended flexible probe is included with the instrument and is the primary feature that enables precise leak location at specific joint and fitting points — particularly in enclosed equipment cavities and tight installation spaces.
2800mAh Lithium Battery (Included)
The integrated lithium battery provides 8-hour continuous working time and charges in 4–6 hours via the included charging connection. No proprietary charging dock required.
Calibration Gas
Available separately for periodic instrument calibration verification. Regular calibration against a certified reference gas maintains detection accuracy and supports compliance with inspection programme standards where documented calibration is required.
Available Variants
BH-90E — Black and white screen version | EX and Freon detection | Standard display
K-100EX — Colour screen version | EX and Freon detection | Enhanced display clarity
Related Products from Alright Engineering Solutions
BT-S100 Portable Gas Leakage Detector — Alternative probe-style detector with USB-C data export and multi-point calibration
BELLMINI Single Gas Detectors — Personal wearable monitors for O2, CO, H2S, NH3, and other industrial gases
BELL LITE Multi Gas Detector — Simultaneous O2, CO, H2S and LEL personal monitoring with ATEX certification
Get in Touch
If combustible gas or refrigerant leak detection is part of your daily inspection or maintenance programme — whether for HVAC servicing, gas installation work, or industrial facility maintenance — the BH-90E is worth evaluating against your current equipment.
Contact Alright Engineering Solutions to request a formal quote, discuss model selection between the BH-90E and K-100EX, or arrange a product demonstration for your team.
📍 3791 Jalan Bukit Merah #06-01, E-Centre @ Redhill, Singapore 159471
