FINAL DRAFT prEN 14931

prEN 14931:2006 (E)
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inside temperature for each compartment;
oxygen concentration for each compartment;
CO 2 partial pressure in the main chamber;
supply pressure of the breathing system;
status of the fire-extinguishing system (filling level, supply pressure) for each chamber;
time;
status of the electrical power supply.
Testing:
a) Inspection of controls and indicating instruments;
b) checking as to whether controls and instruments are clearly marked and illuminated.
4.5.2
The pressure in the ante chamber and main chamber shall be indicated by at least one analogue pressure gauge
each.
Analogue pressure gauges shall have a minimum diameter of 120 mm and conform to at least precision class 0,25
(see EN 837-1).
Testing:
Manufacturers' proof.
Each main chamber shall be provided with a pressure test connection arranged such as to be easily accessible.
Testing:
Inspection.
4.5.3
Facilities shall be provided for continuously recording the pressure in each ante chamber and main chamber. The
system shall indicate pressure variations of 3 kPa (0,03 bar) and time intervals of 1,0 min in a manner which enables
the data to be evaluated. The pressure variations over the previous 3 h shall be visible.
Testing:
Inspection to check whether equipment is provided for recording the working pressure in the ante chamber and main
chamber.
Manufacturers' proof regarding the pressure gauge of the recording instruments.
4.5.4
Continuous measurement, display and recording of the oxygen concentration in percent by volume shall be possible
separately for each ante chamber and main chamber. The sampling point shall be located close to the ventilation
outlet. For chambers designed to accommodate more than 12 persons a second measuring device shall be installed.
This second sampling point should be located close to the point where the highest oxygen concentration is to be
expected.
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