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Overview
Carbon monoxide is one of the most hazardous gases encountered across industrial, marine, and confined space working environments — colourless, odourless, and capable of reaching dangerous concentrations before workers have any physical warning. For safety managers and HSE officers running gas detection programmes, the reliability of a CO detector is only as good as the calibration gas used to verify it. A detector that has drifted out of calibration — even slightly — can under-report CO concentration, give delayed alarms, or fail entirely to trigger a response at the threshold where it matters most.
The CO – Carbon Monoxide 50 PPM Balance Air Calibration Gas Cylinder is a precision-blended span gas mixture formulated specifically for calibrating and bump testing carbon monoxide gas detectors. At 50 ppm CO balanced with high-purity air, this mixture is prepared at a concentration that falls within the mid-range of most CO detector measurement spans — making it suitable for accurate span calibration, sensor linearity verification, and routine functional bump testing across a wide range of portable and fixed CO detection instruments.
What sets this calibration gas apart for procurement teams and calibration technicians is the availability across five cylinder sizes — 34L, 58L, 103L, 110L, and 116 litres — allowing safety programmes to select the most operationally and economically appropriate cylinder volume based on fleet size, calibration frequency, and site logistics. Whether you are outfitting a single confined space entry team or managing calibration gas supply for a multi-site industrial operation, having the right cylinder size on hand eliminates unnecessary gas wastage, reduces cost-per-calibration, and keeps your calibration programme running without interruption.
Key Features
50 PPM Carbon Monoxide Concentration — Mid-Range Span Calibration
The 50 ppm CO concentration is selected to fall within the working range of most commercially deployed CO gas detectors, which typically have full-scale ranges of 100 to 500 ppm. Calibrating at a mid-range concentration — rather than near the low or high end of the sensor’s span — provides a more meaningful and accurate verification of sensor response across the detection range that matters most for occupational safety. For HSE officers and calibration technicians, a 50 ppm target concentration is straightforward to verify against instrument specifications and calibration records.
Balance Air Formulation — Realistic Detection Environment
The balance gas is high-purity air — a mixture of nitrogen and oxygen in proportions that replicate normal atmospheric conditions. Because CO detectors are calibrated to respond to CO in an air background, using a balance-air formulation ensures the calibration gas accurately represents the gas environment the detector will encounter in real field use. This matters because some alternative balance gases — such as nitrogen — can suppress or alter the electrochemical sensor response in ways that introduce calibration error. Balance air eliminates this variable and gives you the most representative calibration result.
Multiple Cylinder Sizes — C10 Cylinders from 34L to 116L
The calibration gas is available in five cylinder sizes within the C10 cylinder format: 34L, 58L, 103L, 110L, and 116 litres. Smaller cylinders such as the 34L are well suited for portable use — easy to transport to remote sites, confined space entry locations, or offshore platforms. Larger cylinders in the 103L–116L range are the practical choice for central calibration stations, calibration laboratories, or high-frequency calibration programmes servicing large detector fleets. Matching cylinder size to operational need reduces both gas wastage and procurement frequency.
Precision Gas Blending — Certified Concentration Accuracy
Calibration gas mixtures require tight concentration tolerances to produce meaningful calibration results. This CO 50 ppm balance air mixture is produced using precision gravimetric blending techniques that ensure the stated concentration is accurate within certified tolerances. For HSE officers maintaining calibration records that are subject to regulatory audit — whether under OSHA, ATEX-related safe work procedures, or ISO 17025-referenced calibration programmes — certified concentration accuracy provides the traceability needed to support defensible calibration documentation.
Compatible with Portable and Fixed CO Detectors
The 50 ppm CO balance air mixture is suitable for use with a broad range of portable single-gas and multi-gas CO detectors, as well as fixed-point electrochemical CO sensors deployed in industrial monitoring systems. Common compatible instruments include those manufactured by Industrial Scientific, Honeywell (BW Technologies), Draeger, MSA, GMI, and similar occupational safety instrument brands. Procurement teams sourcing calibration gas for a mixed instrument fleet can use this single mixture to service CO sensors across multiple instrument types.
Technical Specifications
Gas Type: Carbon Monoxide (CO)
Concentration: 50 ppm
Balance Gas: Air
Cylinder Format: C10
Available Cylinder Sizes: 34L / 58L / 103L / 110L / 116 Litres
Mixture Type: Span Gas (Single Component)
Application: Span Calibration, Bump Testing, Sensor Verification
Compatible Detectors: Portable CO Single-Gas Detectors, Multi-Gas Monitors, Fixed Electrochemical CO Sensors
Product Category: Span Gas and Regulator
Benefits
Detector accuracy you can document. Using a certified 50 ppm CO balance air span gas gives your calibration programme a traceable, verifiable reference point. When your CO detectors are calibrated against a certified standard, you can record calibration results with confidence — and demonstrate to auditors, regulators, or class surveyors that your instruments are functioning within their specified detection accuracy.
Protects workers in high-risk CO environments. In confined spaces, boiler rooms, vehicle maintenance workshops, and industrial processing areas, CO can accumulate to dangerous levels rapidly. A properly calibrated CO detector gives workers the alarm response time needed to evacuate before reaching dangerous exposure concentrations. Calibration gas is the tool that keeps detectors at that level of reliability — not a regulatory box to tick, but an active safety control.
Reduces calibration cost through appropriate cylinder sizing. Procuring the right cylinder volume for your calibration frequency means you use what you buy. A 34L cylinder for an infrequent single-site programme avoids the cost of carrying large volumes of unused gas past expiry date. A 116L cylinder for a high-frequency multi-instrument programme reduces the cost-per-calibration and the administrative burden of frequent cylinder replacement procurement.
Simplifies multi-instrument calibration programmes. CO 50 ppm balance air is a broadly compatible span gas concentration — suitable for the most widely deployed CO detector types across industrial safety programmes. For procurement teams managing calibration gas supply for mixed instrument fleets, a single cylinder specification that covers multiple detector types reduces the number of separate gas SKUs to manage and the risk of using a wrong-concentration gas on a particular instrument.
Balance air formulation supports accurate sensor response. Unlike nitrogen-balanced alternatives, the air balance gas accurately replicates the field atmosphere in which CO detectors operate — delivering a calibration result that genuinely reflects how the sensor will respond to CO in a real-world gas exposure event. This is particularly important for electrochemical CO sensors, where the presence of oxygen in the balance gas is a factor in accurate sensor response.
Who It’s For
The HSE Officer Managing a Confined Space Entry Programme
Your team enters confined spaces regularly — tanks, voids, utility tunnels, sewers, and process vessels — where CO can accumulate from incomplete combustion, decomposing organic matter, or exhaust infiltration. Before every entry, your procedure requires a bump test of each worker’s personal gas monitor to confirm sensor response. You need a reliable CO calibration gas supply that your team can use at the point of entry — and a cylinder size that is practical to keep on-site without running out mid-shift or carrying excess stock past its expiry date. The 34L or 58L cylinder is your working tool; the 50 ppm concentration is the recognised span for CO bump testing across most portable detector specifications.
The Industrial Hygienist or Calibration Technician
You manage instrument calibration for a fleet of fixed and portable CO detectors deployed across an industrial facility — a power generation plant, a chemical processing site, a mining operation, or a large manufacturing complex. Your calibration schedule requires span calibration of each CO sensor at regular intervals using a certified reference gas. You need a calibration gas with a documented concentration tolerance, a consistent supply chain, and cylinder sizes that match your calibration bench and site logistics. The larger C10 cylinder options — 103L, 110L, and 116L — give your calibration station the capacity to service a large detector fleet without constant cylinder changeovers, and the certified 50 ppm CO concentration provides the traceable reference your calibration records require.
The Procurement Manager for a Marine Vessel Operator or Offshore Installation
Your vessels and installations are equipped with personal CO monitors for engine room crew, pump room operators, and confined space entry teams. Your calibration gas supply needs to be sourced through a reliable supplier, available in appropriate cylinder sizes for shipboard storage, and matched to the CO detector types in your fleet inventory. You need a supplier who can confirm gas concentration, cylinder size availability, and lead time — and provide the documentation your safety management system records require. Having access to multiple cylinder sizes allows you to specify the right volume for each vessel’s detector fleet and calibration frequency without over-ordering.
Possible Applications
- Confined space entry programmes — Bump testing portable CO monitors before each entry into tanks, voids, manholes, and process vessels in industrial and marine environments
- Engine room and boiler room gas monitoring — Span calibration of fixed CO sensors monitoring combustion areas on vessels and in industrial facilities where CO from fuel combustion is a recognised hazard
- Vehicle maintenance workshops and loading bays — Calibration of CO detectors used to monitor carbon monoxide build-up from vehicle exhaust in enclosed workshop and loading bay environments
- Tunnel and underground construction — Bump testing and calibration of personal monitors worn by workers in tunnelling, underground mining, and civil construction environments where diesel exhaust and blasting operations generate CO
- Power generation plants — Span calibration of fixed CO monitoring systems in turbine halls, generator rooms, and boiler houses where combustion processes create CO exposure risk
- Petrochemical and chemical processing facilities — Calibration gas supply for CO sensors integrated into process area gas detection systems and personnel safety monitoring programmes
- Fire and safety equipment service companies — Calibration gas supply for instrument service workshops providing CO detector calibration services to industrial and commercial clients
- Offshore oil and gas platforms — Calibration and bump test gas supply for CO monitors used in enclosed machinery spaces, accommodation modules, and confined space entry operations on offshore installations
Trust and Certifications
Precision-Blended Calibration Gas — Certified Concentration
Calibration gases for occupational safety instruments are produced to recognised standards for gas mixture accuracy and traceability. The CO 50 ppm balance air mixture is prepared using precision blending methods that produce a certified concentration within stated tolerances — providing the traceable reference standard required for calibration programmes that must demonstrate regulatory compliance or support safety management system audits.
Relevant to OSHA and Workplace CO Exposure Regulations
Occupational health and safety regulations across most jurisdictions — including OSHA in the United States, HSE in the United Kingdom, and equivalent national authorities — require employers to monitor and control worker CO exposure in environments where the hazard is present. Using a certified span gas to calibrate CO detectors is a recognised component of a compliant gas detection and monitoring programme. The 50 ppm CO balance air mixture supports calibration of detectors set to alarm at CO concentrations referenced against OSHA’s permissible exposure limit (PEL) of 50 ppm TWA and action levels common in industrial safety programmes.
Suitable for ISO 17025-Referenced Calibration Programmes
Calibration laboratories and instrument service organisations operating under ISO 17025 accreditation require traceable reference standards for all calibration activities. Certified calibration gas mixtures with documented concentration tolerances support the traceability requirements of ISO 17025-referenced CO detector calibration procedures — providing the documented reference standard that accredited calibration records require.
Supplied by Alright Engineering Solutions
The CO – Carbon Monoxide 50 PPM Balance Air Calibration Gas Cylinder is supplied through Alright Engineering Solutions Pte. Ltd., an authorised distributor of portable and fixed gas detection equipment, calibration gases, and span gas regulators serving industrial, marine, and offshore clients in Singapore and the regional market. Our team can advise on cylinder size selection, compatible regulator specifications, and calibration gas supply arrangements suited to your detection programme requirements.
Accessories and Variants
Cylinder Size Variants
34 Litre (C10) — Compact cylinder suited for portable field use, confined space entry teams, and low-frequency single-site calibration
58 Litre (C10) — Mid-size cylinder for regular site calibration programmes and small instrument fleets
103 Litre (C10) — Large capacity cylinder for calibration stations and medium-to-high frequency programmes
110 Litre (C10) — High-capacity cylinder for high-frequency calibration programmes and large detector fleets
116 Litre (C10) — Maximum capacity C10 cylinder for calibration laboratories, service workshops, and large industrial facilities
Compatible Span Gas Regulators
A matched regulator is required to connect the calibration gas cylinder to your detector or calibration adapter. Alright Engineering Solutions can supply compatible span gas regulators sized for the C10 cylinder format — with flow rate options appropriate for portable detector bump testing and bench calibration applications. Using a correctly specified regulator ensures consistent gas delivery at the flow rate your instrument requires, preventing under-delivery that can cause incomplete sensor response during calibration.
Related Calibration Gas Products
Multi-Gas Calibration Mixtures — CO, H₂S, O₂, and LEL combinations for calibrating multi-gas personal monitors in a single bump test cycle
H₂S Calibration Gas (Balance Air) — Hydrogen sulphide span gas for calibrating H₂S sensors in portable and fixed detection instruments
O₂ Calibration Gas — Oxygen deficiency and enrichment calibration gas for oxygen sensor verification
LEL Calibration Gas (Methane or Pentane Balance Air) — Combustible gas span mixtures for calibrating catalytic bead and infrared LEL sensors
Get in Touch
If you are sourcing CO – Carbon Monoxide 50 PPM Balance Air calibration gas for your gas detection programme — whether for confined space entry operations, fixed system maintenance, or instrument calibration services — contact Alright Engineering Solutions to confirm cylinder size availability and request a formal quotation.
Our team can also advise on compatible regulators, multi-gas calibration mixtures, and calibration gas supply arrangements suited to your instrument fleet and programme requirements.
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