Highly toxic if inhaled and may be difficult to detect without instrumentation, as it can be odourless; Nitric oxide (NO) also reacts readily with oxygen in air, forming nitrogen dioxide (NO₂). This means that a release may quickly create a mixed atmosphere containing multiple nitrogen oxides, complicating exposure monitoring and risk management.

Hiring equipment is often the most efficient solution where monitoring is required for short-term projects, including shutdowns, investigations, or operational changes.

When Is Nitric Oxide Monitoring Required?

Monitoring is usually required wherever nitric oxide may be produced or released in a way that could expose workers. This may occur during maintenance work, process sampling, plant start-up activities, or unexpected operational conditions.

Situations that need nitric oxide monitoring

Examples of workplaces where nitric oxide monitoring may be required include:

• Nitric acid production and related process areas
• Combustion and exhaust systems in power generation or industrial plants
• Semiconductor manufacturing processes involving nitrogen oxides
• Wastewater treatment processes linked to nitrification and denitrification
• Chemical or pharmaceutical synthesis where nitric oxide is generated
• Rayon bleaching and other industrial processes involving nitrogen compounds
• Medical or research environments using inhaled nitric oxide systems

Monitoring is also important in enclosed or poorly ventilated areas where gases may accumulate.

Which Nitric Oxide Monitor Should I Hire?

Ventilation patterns, background gases, and the positioning of monitors within a workspace can affect the reliability of NO detection. Routine instrument checks and proper calibration are also important to maintain accurate readings over time.

Ribble Enviro provides practical advice on choosing a nitric oxide detector hire, helping organisations complete site risk assessments and manage occupational exposure day-to-day.

Electrochemical personal monitors

Electrochemical sensors are commonly used for real-time nitric oxide monitoring and are typically fitted to portable instruments used for personal detection. Examples include the Honeywell BW Solo and Crowcon Gasman, which provide wearable monitoring during routine work.

These sensors can be influenced by temperature, humidity, and cross-sensitivity to certain gases such as hydrogen sulphide (H₂S) and nitrogen dioxide (NO₂). Routine bump testing and calibration are therefore necessary.

Multi-gas instruments for mixed atmospheres

Where other hazardous gases may also be present, a multi-gas monitor may be more practical. Devices such as the MSA ALTAIR 5X or RAE Systems MultiRAE allow nitric oxide to be monitored alongside other atmospheric hazards.

Area monitoring for temporary work zones

For shutdowns or maintenance work in defined areas, temporary area monitoring may provide an additional layer of warning. If concentrations increase, alarms from an area monitor can alert the wider team and support safe working practices.

For advice on nitric oxide detector hire, speak with Ribble Enviro about your process and working environment. Our team can help you select the most appropriate monitoring approach for your situation.