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Nitric acid – HNO3

Find here the essential information on nitric acid (HNO3) or hydrogen nitrate: characteristics, effects on health, detection devices & systems (HNO3 gas detector) and proper respiratory protective equipment (nitric acid respirator gas mask or powered air respirator with E-P3 combined filter).

HNO3 gas detector and acid nitric respirator for better safety

Nitric acid properties

Nitric acid (HNO3) – also known as hydrogen nitrate – is mainly used in the food industry for nitrogen fertilizers production. It is also used to produce explosives and nitrous compounds. This substance can be used in pharmaceutics, in the steel industries and also for metals treatment (pickling, scraping).

CASTWA (8 hours)STEL (15 minutes)LELIPDensity / AirFilter / SCBA
7697-37-2– 1 ppm11.95 eV2.2E-P3

Nitric acid effects on health

At normal temperature and pressure conditions, nitric acid (HNO3) is a colorless liquid with a suffocating smell and can be detected at extremely low concentrations. It is toxic by inhalation (H331), corrosive for the respiratory tracts and can cause severe chemical burns and damage the eyes. The IARC* classified this gas in category 1 as it revealed links between chronic exposure and several forms of cancer.

*IARC: International Agency for Research on Cancer (depends on WHO World Health Organization)

HNO3 gas detector (Nitric acid)

Even if nitric acid gas can be detected through smell, only a HNO3 gas detector can accurately measure concentrations of this extremely toxic gas. Thus a ppm or ppb nitric acid detection device should be selected to monitor concentrations.

The colorimetric gas detection tube system is a simple and accurate solution composed by a manual sampling pump and a specific gas detection tube. They are designed for use together.

  • Gas detector tubes Colorimetric tube

Colorimetric tubes

The colorimetric gas detection tube system is a simple and accurate solution composed by a manual sampling pump and a specific gas detection tube. They are designed for use together.

Gas detector tubes Colorimetric tube
  • Accurate: the sampling pump features a mechanical accuracy piston which creates a vacuum then enables direct reading on the colored tube (colorimetric tube)
  • Swift: one or two pump strokes are enough to draw sample and the value can be directly read on the tube
  • User-friendly: no knowledge, no specific process and no technical competence are required

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TWA measuring system (time-weighted average) – also known as dosimeter tube or passive tubes gas detection – measures the time-weighted average concentrations of a gas in ambient air.

  • Gas detector tubes Dosimetric tubes

Dosimeter tubes

TWA measuring system (time-weighted average) – also known as dosimeter tube or passive tubes gas detection – measures the time-weighted average concentrations of a gas in ambient air.

Gas detector tubes Dosimetric tubes
  • The dosimeter tube is inserted in its holder and wore close to the breathing zone (e.g. a shirt collar) to get an accurate measure of inhaled concentrations. This allows the monitoring of hazardous exposure during a working day.
  • Thanks to this system, wokers can easily get daily exposure concentrations and evaluate working areas. These simple and direct measures require no specific analyzis instruments or complex operation procedures.

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The SPM Flex is an optical calibration-free gas optical analysis system. This single point tape-based toxic gas detector can accurately (ppb measurement) and swiftly monitor the presence of a hazardous gas.

  • Honeywell SPM Flex gas monitor with optical toxic gas analysis

Toxic gas optical analysis – SPM FLEX gas detector

The SPM Flex is an optical calibration-free gas optical analysis system. This single point tape-based toxic gas detector can accurately (ppb measurement) and swiftly monitor the presence of a hazardous gas.

Honeywell SPM Flex gas monitor with optical toxic gas analysis
  • Chemcassette® technology – immune to interferences, more than 50 available gases.
  • Calibration-free, minimal maintenance .
  • Audiovisual alarm (2 thresholds).
  • User-friendly interface and gas concentration digital display.
  • UL 61010-1 / CSA-C22.2 / IEC 61010-1 certified

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Nitric acid respiratory protection (HNO3)

As nitric acid is irritating to the eyes, workers have to wear a full-face mask for short-term applications or a powered air purifying respirator - which is more comfortable - with E-P3 combined filter up to 30 times the OEL.

The VISION panoramic gas mask is compatible with particle, gas and combined filters. It can also be used as a facepiece for powered air respirators and SCBA.

Vision panoramic gas mask

The VISION panoramic gas mask is compatible with particle, gas and combined filters. It can also be used as a facepiece for powered air respirators and SCBA.

VISION : masque panoramique à large champs de vision (fixation cartouche frontale ou latérale)
  • Large field of wiew (98%) without visual distorsion
  • Reinforced visor resistant to solvents and scratches
  • Two filter mounting locations: central or right side
  • LSR face seal (liquid silicon rubber)
  • Available in 3 different sizes for optimal comfort
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The SARI gas mask provides operating comfort and efficient protection against toxic gases and particles (solid, radioactive, smokes), bacteria and virus.

Full face gas mask – SARI

The SARI gas mask provides operating comfort and efficient protection against toxic gases and particles (solid, radioactive, smokes), bacteria and virus.

masque sari contre les gaz toxiques et vapeurs chimiques
  • Compatible with PRO2000 filter range (gas, particle and combined)
  • Central phonic membrane for easy communication
  • Compatible with powered air equipment
  • Internal mask with non-return and anti-fog valves, reduces CO2
  • Fully adjustable 5 points harness for improved operating comfort
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The Duraflow powered air respirator is a versatile solution for hazardous workspaces. It provides a quality respiratory protection for a fair price.

  • The powered air purifying respirator Duraflow PAPR

Powered air purifying respirator Duraflow

The Duraflow powered air respirator is a versatile solution for hazardous workspaces. It provides a quality respiratory protection for a fair price.

The powered air purifying respirator Duraflow PAPR
  • Compatibility with RD DIN 40 universal filter cartridges
  • Rechargeable battery – 2 available version: 8 or 16 hours runtime
  • Automatic airflow regulation (160l/min)
  • Visual alarms, notifications and display
  • CEN1294 & CE0086 certified, IP55/IP67

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The Proflow2 PAPR is a compact and lightweight device featuring a curved backplate for user comfort during long-term applications. This powered air purifying respirator is available in 120L/min or 160L/min versions.

  • complete Scott Safety PAPR powered-air-purifying Proflow2

Powered air purifying respirator PROFLOW 2

The Proflow2 PAPR is a compact and lightweight device featuring a curved backplate for user comfort during long-term applications. This powered air purifying respirator is available in 120L/min or 160L/min versions.

complete Scott Safety PAPR powered-air-purifying Proflow2
  • DIN40 standard filters compatible with single-cartridge masks.
  • From 7 to 15 hours runtime depending on the face piece.
  • 70 dB audible low battery alarm.
  • Compatible with many face pieces.
  • Certifications: complies with EN12941 and 12942 standards.
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