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Overview
Combustible gas detectors are the first line of defence against explosion and fire risk in industrial facilities, offshore platforms, marine vessels, and anywhere flammable gases are handled, stored, or processed. But a combustible gas detector that hasn’t been calibrated correctly — or calibrated against the wrong reference gas — gives you false confidence rather than real protection. A detector reading 40% LEL when actual methane concentration has already reached 60% LEL is not a safety instrument; it’s a liability. The only way to know your combustible gas detector is reading accurately is to calibrate it against a certified span gas at a verified concentration.
The 10%Vol Methane Balance Nitrogen (10% CH4 Bal N2) span gas cylinder is a precision calibration gas mixture formulated for use with catalytic bead and infrared combustible gas detectors that are calibrated in terms of % LEL (Lower Explosive Limit). Methane has an LEL of approximately 5% by volume in air — meaning a 10%Vol CH4 mixture represents 200% LEL, which at first sounds counterintuitive but is actually the standard used for full-scale or mid-scale calibration of LEL detection instruments. More commonly for field calibration, the 10%Vol CH4 mixture is used to calibrate methane-specific detectors or instruments configured to read %Vol CH4 rather than %LEL — particularly in natural gas distribution, biogas, and marine applications where volume concentration rather than explosion percentage is the operationally relevant reading.
What sets this product apart for procurement teams is the combination of a precisely certified 10%Vol CH4 concentration — with nitrogen as a clean, inert balance gas free of oxygen interference — and availability across five practical cylinder sizes from 34L to 116L. Whether you’re equipping a single vessel on-board gas detection kit or running a high-frequency calibration programme across a large instrument fleet, the right cylinder size is available without compromise.
Key Features
10% Volume Methane Concentration — High-Range CH4 Calibration Reference
The 10%Vol CH4 concentration in this mixture provides a high-range methane calibration reference used for instruments configured to read in %Vol CH4 — as is common in natural gas leak detection, biogas monitoring, and marine cargo gas detection applications. At 10% by volume, this mixture sits well above the methane LEL (approximately 5%Vol) and within the range where catalytic bead sensor response linearity and infrared sensor accuracy can be verified across a meaningful portion of the detection range. For instruments used in environments where methane concentrations approaching or exceeding the LEL are a genuine operational concern, calibrating at 10%Vol provides a more demanding and operationally realistic verification point than a lower-concentration mixture.
Balance Gas: Nitrogen (N2) — Oxygen-Free Reference Environment
Nitrogen is used as the balance gas in this mixture for a technically important reason: many catalytic bead combustible gas sensors require oxygen to function correctly — the oxidation of the combustible gas on the sensor bead is how the sensor generates its signal. When calibrating with an oxygen-free (O2-free) CH4/N2 mixture, the response of a catalytic bead sensor will differ from its response in air. This is understood and accounted for in calibration procedures that use CH4/N2 mixtures specifically — and is the correct choice for infrared (IR) sensor-based instruments, which do not require oxygen for methane detection and calibrate accurately against CH4/N2 reference gas. For procurement teams specifying calibration gas, confirming the correct balance gas (air vs nitrogen) for the specific instrument’s sensor technology is an important step before ordering.
Multiple Cylinder Sizes — 34L to 116L
This calibration gas mixture is available in five cylinder sizes: 34L, 58L, 103L, 110L, and 116L. The 34L cylinder is a practical fit for a vessel on-board calibration kit or a compact field calibration set where storage space and portability are constraints. The 58L cylinder suits a small workshop or a maintenance team calibrating a modest number of instruments on a regular schedule. The 103L to 116L cylinders are the appropriate choice for a centralised calibration station, a gas detection service company, or a large industrial facility running a high-frequency calibration programme across a significant instrument fleet. Selecting the correct cylinder volume for actual consumption rate directly reduces per-calibration gas cost and eliminates the waste of gas expiring unused.
Certified Concentration Accuracy
This mixture is prepared and supplied as a certified calibration gas with the actual CH4 concentration verified against the declared 10%Vol specification before supply. For combustible gas detectors used in safety-critical industrial, marine, and offshore applications, calibration against a certified reference gas is the technically correct standard — and the auditable record required by most safety management system frameworks, gas detector manufacturer service instructions, and regulatory inspection requirements. A certificate of analysis is available with the cylinder to support calibration programme documentation.
Compatible with Standard Span Gas Regulators
The cylinder valve is compatible with standard demand-flow and constant-flow span gas regulators used for portable gas detector calibration. No special fittings or adaptors are required for most common portable instrument calibration setups. For procurement teams sourcing 10%Vol CH4 Bal N2 as part of a calibration gas and accessories order, the standard valve specification simplifies the procurement process and ensures compatibility with existing regulator stock.
Technical Specifications
Product: Span Gas — Calibration Gas Mixture
Category: Span Gas and Regulator
Gas Mixture: 10%Vol Methane (CH4), Balance Nitrogen (N2)
Methane Concentration: 10% v/v (volume percent)
Balance Gas: Nitrogen (N2)
Cylinder Sizes (C10): 34L / 58L / 103L / 110L / 116L
Application: Combustible gas detector span calibration (%Vol CH4 and %LEL instruments)
Compatible Instruments: Infrared (IR) combustible gas detectors and catalytic bead instruments configured for CH4/N2 calibration
Mixture Type: Binary (CH4 / N2)
Benefits
Verifies combustible gas detector accuracy at a concentration that represents a realistic operational hazard level. Calibrating at 10%Vol CH4 confirms that the instrument responds correctly at a methane concentration that is operationally significant — above the LEL threshold and within the range where an accurate reading directly influences the decisions made by workers and supervisors on site. A detector verified only at a very low span concentration may still under-read at higher concentrations where the accuracy of the reading genuinely determines whether a work area is safe to enter or operate in.
Supports regulatory and safety management system compliance for combustible gas detection programmes. Combustible gas detectors used in confined space entry, hot work authorisation, and industrial process monitoring are subject to calibration requirements under safety management frameworks, regulatory standards, and gas detector manufacturer service requirements. Using a certified 10%Vol CH4 Bal N2 span gas provides the reference mixture required for a valid, documented calibration event — and the certificate of analysis supports the calibration records required for safety audits, regulatory inspections, and incident investigations.
Oxygen-free balance gas prevents sensor contamination in sensitive calibration environments. In applications where the calibration environment may already contain residual combustible gas or where the calibration gas is being applied to instruments stored or used in inert or oxygen-depleted environments, using an O2-free CH4/N2 mixture eliminates the risk of introducing an oxygen-containing balance gas that could interfere with the calibration environment or the instrument’s measurement chemistry.
Flexible cylinder sizing reduces calibration gas procurement cost and waste. Matching the cylinder volume to actual calibration programme consumption — rather than defaulting to a single standard size — directly reduces the total cost per calibration event and eliminates the expense of gas remaining in cylinders that have passed their use-by date. The five available cylinder sizes for this mixture give procurement teams the flexibility to manage calibration gas cost as a variable that can be optimised rather than a fixed overhead.
Who It’s For
The Marine Gas Detection Engineer or Vessel Chief Officer
You’re responsible for maintaining portable and fixed combustible gas detectors on board a gas carrier, LNG vessel, or hydrocarbon tanker. Your instruments are calibrated to read in %Vol CH4 or equivalent hydrocarbon gas concentrations — not just %LEL — because the operational decisions made during cargo handling, inerting, and tank inspection require accurate volume concentration readings, not just explosion threshold proximity. You need a certified 10%Vol CH4 Bal N2 span gas available on board or through your port supplier for scheduled calibration, and the 34L or 58L cylinder is the right fit for on-board storage without taking up excessive locker space.
The HSE Manager at a Natural Gas Distribution or Utilities Facility
Your facility operates gas distribution infrastructure — pipelines, compressor stations, metering installations, or gas storage — where methane leak detection is a continuous operational requirement. Your portable gas monitors are calibrated to read %Vol CH4 to support leak surveys and maintenance inspections, and your calibration programme requires a consistent supply of certified CH4 span gas to maintain the calibration schedule across your instrument fleet. You need a cylinder size and reorder cycle that fits your consumption rate and doesn’t create storage or cylinder management issues at your site.
The Safety Equipment Service Technician or Calibration Workshop Operator
You calibrate combustible gas detectors for industrial and marine clients — some configured for %LEL and some for %Vol CH4 readings — and you maintain a stock of certified calibration gas mixtures to cover the range of instruments your clients use. The 10%Vol CH4 Bal N2 mixture is a standard item in your calibration gas inventory, and you need it available in a cylinder size that suits your workshop throughput and your clients’ instrument specifications. The larger cylinder sizes — 103L to 116L — are the practical choice for a service workshop calibrating instruments in volume.
Possible Applications
- Marine gas carrier and LNG vessel operations — Calibration of portable and fixed combustible gas detectors used during cargo tank inspection, inerting operations, and confined space entry on gas carriers, LNG vessels, and hydrocarbon tankers
- Natural gas distribution and transmission — Calibration of portable methane leak detectors and fixed gas detection systems used in pipeline inspection, compressor station monitoring, and gas metering installation maintenance
- Biogas and landfill gas facilities — Calibration of methane monitors used in biogas plant process monitoring, landfill gas collection system inspection, and confined space entry into digesters and gas handling structures
- Offshore oil and gas platforms — Calibration of combustible gas detectors used in process areas, wellhead zones, and enclosed platform spaces on offshore production platforms, FPSOs, and drilling rigs
- Coal mine and underground gas detection — Calibration of methane monitors used for firedamp detection in underground coal mines and tunnelling operations where methane outgassing creates explosion risk
- Industrial plant confined space entry — Calibration of multi-gas instruments with combustible gas channels before confined space entry into tanks, vessels, and enclosed spaces where hydrocarbon gas accumulation is a recognised hazard
- Gas detection service and rental companies — Calibration gas supply for instrument rental fleet maintenance and service workshop calibration programmes for clients with methane-specific detection requirements
- Shipbuilding, drydock, and ship repair — Calibration support for combustible gas detectors used during hot work operations, gas freeing verification, and tank entry at ship repair and construction facilities
Trust and Certifications
Certified Calibration Gas — Verified 10%Vol CH4 Concentration
This 10%Vol CH4 Bal N2 mixture is supplied as a certified calibration gas with the actual methane concentration verified against the declared 10%Vol specification before supply. Certified calibration gas provides the traceable reference standard required for combustible gas detector calibration to meet the requirements of safety management systems, regulatory frameworks, and gas detector manufacturer service guidance. A certificate of analysis confirming the verified concentration is available with each cylinder for inclusion in calibration programme documentation and safety audit records.
Compliance with Combustible Gas Detector Calibration Requirements
Combustible gas detectors used in confined space entry, marine cargo operations, and industrial process monitoring are subject to calibration requirements under standards and regulations including OSHA confined space and process safety requirements, IMO gas carrier codes and vessel safety management requirements, and the calibration procedures defined in gas detector manufacturer service manuals. Using a certified CH4 span gas at the correct concentration is a core requirement for a calibration event that is valid under these frameworks and defensible under audit or regulatory inspection.
Supplied by Alright Engineering Solutions
The 10%Vol Methane Balance Nitrogen span gas cylinder is supplied through Alright Engineering Solutions Pte. Ltd., an authorised distributor of portable and fixed gas detection equipment, calibration gas, and safety products in Singapore. Alright Engineering Solutions supports marine, industrial, and offshore clients across the Singapore and regional market with gas detection equipment procurement, calibration gas supply, and safety product sourcing.
Accessories and Variants
Span Gas Regulator
A compatible span gas regulator — demand-flow or constant-flow — is available to use with this cylinder, providing the controlled low-pressure output required for portable combustible gas detector calibration. Contact Alright Engineering Solutions to confirm the correct regulator type and fitting for your specific instrument model before ordering.
Available Cylinder Sizes
34 Litres (C10) — Compact portable size for vessel on-board kits and individual field calibration sets
58 Litres (C10) — Mid-range size for small-fleet programmes and vessel maintenance calibration kits
103 Litres (C10) — Standard industrial volume for shore-based calibration stations and medium-frequency programmes
110 Litres (C10) — High-volume option for large instrument fleets and high-frequency calibration schedules
116 Litres (C10) — Maximum volume for centralised calibration workshops and ongoing high-throughput programmes
Related Calibration Gas Products
Multi-gas calibration mixtures (CH4/CO/H2S/O2 Bal Air) — Four-gas combination span cylinders for multi-gas portable monitor calibration covering combustible gas, oxygen, CO, and H2S channels in a single gas application
LEL-range methane calibration gas (e.g. 50% LEL CH4 Bal Air) — Lower-concentration methane in air balance for catalytic bead LEL sensor calibration where an air-balance mixture is required
12% Oxygen Bal N2 — Low-alarm oxygen span gas for two-point O2 sensor calibration, used alongside combustible gas span gas in a complete multi-gas instrument calibration programme
Zero gas cylinders — High-purity nitrogen for zero-point instrument verification before span calibration
Get in Touch
If you need to source 10%Vol Methane Balance Nitrogen span gas — for a vessel on-board calibration kit, a gas detection maintenance workshop, or an ongoing industrial or offshore calibration programme — contact Alright Engineering Solutions to confirm cylinder availability, select the right cylinder size for your programme, and request a formal quote.
Our team can also assist with span gas regulator selection, complementary calibration gas mixtures, and portable combustible gas detection equipment for marine, industrial, and offshore safety programmes.
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