Cryotherapy using liquid nitrogen - measuring the decrease in oxygen concentration in the ambient air.
Legal basis (in Polish law)
Rozporządzenie w sprawie ogólnych przepisów bezpieczeństwa i higieny pracy
Dz.U. 2003 nr 169 poz. 1650
§ 97.1. Pomieszczenia przeznaczone do składowania lub stosowania materiałów niebezpiecznych pod względem pożarowym lub wybuchowym oraz pomieszczenia, w których istnieje niebezpieczeństwo wydzielania się substancji sklasyfikowanych jako niebezpieczne, powinny być wyposażone w:
1) urządzenia zapewniające sygnalizację o zagrożeniach;
Detected substance/property
- Substance/property:
- oxygen (O2) §
- Hazard:
- hypoxia
- Density relative to air:
- 1.11
Location of detectors
- outside the cryochamber;
- In the occupied zone; 1.6-1.8 m above floor level;
- In an area not directly exposed to outside air, water vapour, liquids;
- Away from supply air vents, window and door openings.
Standard configurations of gas detection systems
Example 1
- System topology
- Star
- Supply voltage of the control unit
- 230VAC
- Control unit
- MD-1.Z
- Maximum number of gas detectors
- 1
- Emergency power backup
- ✓
Devices used in the configuration of the gas detection system
DG-9E5/N
Sensor electrochemical
Sensor electrochemical
Type of device: DG/F — Threshold detectors of toxic and combustible gases (also oxygen and refrigerants) with splash-proof construction
MD-1.Z
Type of device: MD-1, MD-2, MD-4 — Control and power supply units for 1 or up to 2/4 of DEX/F, DEX/A, DG/F or DG.EN threshold gas detectors
Example 2
- System topology
- Star
- Supply voltage of the control unit
- 12VDC
- Control unit
- MD-2.A
- Maximum number of gas detectors
- 2
- Emergency power backup
- ✓
Devices used in the configuration of the gas detection system
DG-9E5/N
Sensor electrochemical
Sensor electrochemical
Type of device: DG/F — Threshold detectors of toxic and combustible gases (also oxygen and refrigerants) with splash-proof construction
MD-2.A
Type of device: MD-1, MD-2, MD-4 — Control and power supply units for 1 or up to 2/4 of DEX/F, DEX/A, DG/F or DG.EN threshold gas detectors
Example 3
- System topology
- Serial (linear)
- Supply voltage
- 230VAC
- Maximum number of gas detectors
- ∞
- Emergency power backup
- —
Devices used in the configuration of the gas detection system
WG-9E5.EGx
Sensor electrochemical
Sensor electrochemical
Type of device: WG.EGx — Threshold, autonomous detectors for carbon dioxide (CO2), carbon monoxide (CO), oxygen (O2), combustible (LPG/CNG) gases or refrigerants
