Compressed Air Quality

Compressed air quality is crucial in various applications, including food and beverage, pharmaceuticals and healthcare, electronics and semiconductor, automotive and aerospace, and clean room environments. Ensuring that compressed air meets the required standards for air quality is essential for maintaining product quality, preventing contamination, ensuring safety, and complying with regulatory requirements in these applications. The quality of compressed air can be measured using sensors and instruments for various parameters such as dew point, oil, particles, and pressure.
The specific requirements for compressed air quality may vary depending on the application, but some common examples of applications where compressed air quality is critical include:

Food and Beverage Industry: Compressed air is often used in the food and beverage industry for tasks such as food processing, packaging, and bottling. In these applications, compressed air must meet strict standards for air quality to prevent contamination of food and beverages. Compressed air used in these applications typically needs to be free from contaminants such as oil, water, and particles to ensure food safety and maintain product quality.

Pharmaceuticals and Healthcare: Compressed air is used in pharmaceutical manufacturing, as well as in healthcare facilities such as hospitals, laboratories, and pharmacies. In these applications, compressed air must meet stringent standards for air quality to prevent contamination of drugs, medical devices, and sensitive research samples. Compressed air used in pharmaceutical and healthcare applications typically needs to be free from contaminants, such as oil, water, particles, and microorganisms, to ensure product safety and maintain regulatory compliance.

Electronics and Semiconductor Industry: Compressed air is often used in the electronics and semiconductor industry for tasks such as cleaning, drying, and cooling of sensitive electronic components. In these applications, compressed air must be clean and dry to prevent damage to delicate electronic devices caused by moisture, oil, or particles. High-quality compressed air is critical to maintaining the integrity and reliability of electronic components and preventing costly production errors.

Automotive and Aerospace Industry: Compressed air is widely used in the automotive and aerospace industry for tasks such as painting, sandblasting, and pneumatic tools. In these applications, compressed air must be free from contaminants such as oil, water, and particles to prevent defects in the finished products and ensure smooth operation of pneumatic tools and equipment.

Clean room Environments: Clean rooms are controlled environments used in industries such as pharmaceuticals, electronics, aerospace, and research where even minimal airborne contamination can have a significant impact on product quality. Compressed air used in clean room environments must meet extremely stringent standards for air quality, typically requiring high levels of filtration, dew point control, and particle removal.

601 series Compressed Air Quality Analyzer

Product contamination can ruin a business and harm its customers. The typical approach of spot checks and random testing of compressed air systems does not allow businesses to quickly react to contamination events, nor does it provide continual assurance that contamination levels are being kept under control. In the ever quickening change of production, real time monitoring is crucial to protect your products integrity.
The 601 Series Compressed Air Quality Analyzer, measures and monitors contaminants in real time, giving businesses confidence that its products and customers are protected.
The 601 series Compressed Air Quality Analyzer brings together state of the art technology in one easy to use package, allowing businesses to continuously monitor compliance to ISO 8573. The 601 monitors particle, dew point and oil vapor contamination across the full spectrum of ISO 8573 requirements including Class 0. Real time information can be retrieved from the 601 by SCADA systems via MODBUS outputs. The integrated color touch screen display allows users to view all information locally.
The data logging function ensures records are kept intact. Alarm points can be set to trigger in the event that contaminants hit your selected limits. An optional external light or siren can be fitted to the alarm.
The 601 is quick and easy to install, just connect the unit to power and the compressed air supply.

• Particle concentration measurement
- Channel sizes: 0.3 ... 0.5, 0.5 ... 1.0, 1.0 ... 5.0 μm (A)
0.1 ... 0.5, 0.5 ... 1.0, 1.0 ... 5.0 μm (B)
- Laser particle counting technology
- Counting efficiency: 50% for smallest size 95% for all other sizes
• Oil vapor measurement
- Latest PID sensor technology
- Range from 0.003 ... 10.000 mg/m3
- High precision: 5%
• Dew point measurement
- Dual sensor technology (Polymer and QCM)
- Wide measuring range of -100° ... +20°C
- High precision of ±2°C
• Pressure measurement
- Measuring range 0.3 ... 1.5 MPa
- Accuracy of 1% FS
• Compressed air connection through 6 mm quick connect
• Ethernet (Modbus TCP), RS-485 (Modbus RTU) and USB interface
• Low purge air loss
• 100 ... 240 VAC power supply
• 5” color touchscreen with data logger

Sigma 601 is a compact wall-mounted compressed air quality analyzer which measures crucial air quality parameters, to ensure that the air is safe for health and the processes.
Crucial Industries and Sectors rely on a reliable quality compressed air supply, e.g.
•Healthcare facilities
•Data Centers
•High tech applications

Breathing / Rescue Air Contamination Monitors

The dangers associated with breathing contaminated air are also well known and especially critical when using SCBA tanks in emergency situations.

SCBA fill station air quality monitoring
Air filling in fire stations typically refers to the process of filling self-contained breathing apparatus (SCBA) cylinders with compressed air. Firefighters use SCBA to breathe while operating in hazardous environments, such as during firefighting operations in smoke-filled or oxygen-deficient areas.
Monitoring the air quality during the filling of Self-Contained Breathing Apparatus (SCBA) cylinders is critical to ensure the safety and reliability of the breathing air supplied to firefighters. Contaminated or poor-quality air can jeopardize the effectiveness of SCBA and put firefighters at risk.
Fire departments and agencies often follow established air quality standards, such as those set by the National or local regulatory bodies. These standards dictate the acceptable levels of contaminants, including gases, particulates, and moisture, in the breathing air.
Air quality monitoring and maintenance of the air filling equipment are crucial to ensure that firefighters receive the highest quality breathing air when using SCBA during their operations. It helps minimize health risks and ensures the SCBA equipment operates effectively in hazardous environments.

Sigma Hellas has stationary & portable solutions for contaminant monitoring of breathing or rescue air.

Sigma 606 24/7 Continuous Breathing Air Analyser

Sigma 606 is a wall mounted breathing air analyser for continuous monitoring in accordance with EN 12021. This instrument measures gas concentrations for oxygen (O2), carbon dioxide (CO2) and carbon monoxide (CO) in addition to dew point and oil vapour with programmable alarm settings for out of range alarms.

24/7 breathing air monitoring reduces the risk to users from quality issues that might occur between periodic testing and Sigma 606 system does not require regular user input to function reliably. Indeed, once the system is installed, the single pneumatic connection made and the power and signal connections established, the system can be relied on to provide alarm signals whenever the parameters exceed preset safe thresholds.

The easy to read touch screen display offers at-a-glance indication of the measured parameters in real time so that any operator can understand the air quality reading without fear of misinterpretation or needing specific training. The touchscreen menu system allows easy viewing and adjustment of the alarm settings and has an integral datalogger and PDF report generator for spot checks and specific testing.

Communication to BMS/SCADA systems or the dedicated S4A software is through Modbus TCP/RTU and there is an optional 4G dongle to enable wireless communication. Traditional local alarms can be wired through an optional 8 way relay expansion should that be needed.

S606 offers 24/7 breathing air user safety through continuous measurement from a self contained stand-alone system that only requires periodic calibration through exchange sensor modules that can be fitted by the user. There is no need for highly trained specialists or external contractors for this and the comprehensive instruction manual provides all the information and training needed.

• O2 0-25%
• CO2 0-1000ppm
• CO 0-20ppm
• H2O -100 +20degC TD
• Oil Vapour 0.001 – 5.000mg/m3
• Pressure 0-16bar
• Modbus TCP/RTU Communication
• Programmable alarms
• PDF report generator
• Integral data logger

The S606 is perfect for monitoring breathing air quality continuously, but if you need mobile intermittent testing capability, the S605 is the perfect solution.


Sigma95H-B series with display that can monitor the correct levels of CO2 and CO (NOx optional) in the air system. The unit which is designed for industrial applications is using a long life NDIR CO 2 sensor and an electrochemical CO sensor for this purpose.. The sensors monitor the air in ambient pressure as the compressed air pressure is reduced to ambient pressure for air sampling in a low pressure measurement chamber.
Version Sigma 95H-B-A with an alarm beacon and the alarm setting freely configurable is also available.

Breathing Air Quality Monitor, Fireman CO2 protection, Scuba Diver protection

Sigma 95H-B series Specifications
System max pressure: <15 bar
Response time ≤30 seconds (T90)
Sensor measuring range:
CO2: 0 ~2000 ppm
CO: 0-50 ppm
Sensor operating principle:
CO2: Non-dispersive infrared (NDIR)
CO: Electrochemical -
Accuracy : ≤±5%F.S. (higher accuracy optional)
Sensor operating humidity: 0 - 95% RH, non-condensing
Sensor operating temperature: -20.....+50C
Gas sampling method: suction pump
Sensor operating life expectancy:
CO2: 5 years in air
CO: 18-24 months in air
Recommended calibration interval: 12 months
2.4-inch color display, resolution 320*240
Display content: gas molecular formula, concentration, unit, pump status, etc.
Power supply: 12-24V DC
Current outputs (for one sensor): 4-20mA
Relay output: 1
Other outputs RS485
Alarm mode: buzzer, alarm status prompt on the display screen, high and low alarm values can be set by end user.
Protection rating: IP65
Other configurations: On request