Atest Gaz ProGas 4, Руководство пользователя

Страница: 15 / 48

www.atestgaz.pl
5.2 Installation
5.2.1 Deployment of gas detectors
Deployment of gas detectors must be determined by the system designed with consideration to the
following rules:
medium density detected in relation to density of air:
• detectors of gases with densities less than air density must be mounted nearby the room
ceiling with the maximum distance between the face of the measuring head to the room
ceiling from about 20 to 30 cm,
• detectors of gases heavier than air must be mounted nearby the room floor with the maximum
distance between the face of the measuring head to the room floor from about 20 to 30 cm,
detectors should me mounted at locations where gathering (accumulation) of gas is expected due
to architectural properties of the facility (e.g. in the facility part that is separated from the entire
space by means of walls or other structural components),
the influence of the gas temperature – a substance heavier than air when heated becomes lighter
and migrates upwards, but after cooling, it can flow down toward the floor,
pressure and the expected nature of outflow (leakage / gush),
volatility of gas – in the case of substances of low volatility, the detector should be located as close
as possible to the expected leak,
the impact of environmental conditions – see Section 2.1,
direction of ventilation
• the detectors should be located in areas in the ventilation path from the place of leakage to the
extraction unit,
• in the event that the route may be variable, four detectors should be provided so as to
"circumnavigate" a potential source of emissions,
• in the case of outdoor installation, it is necessary to take into account the expected direction of
the wind,
likely whereabouts of the people in relation to emission sources – detectors should "fence off" the
personnel from the source,
mechanical shock – the detector is made in high strength aluminium casing, resistant to very high
mechanical shocks. However, it is necessary to protect the detector from damaging exposures,
locations of detectors must enable easy checks and adjustments as well as replacement or
disconnection of each detector.
5.2.2 Mechanical mounting of detectors
Detectors should be wall-mounted within the distance not less than the limit indicated in
Figure 9. Should the distance is less the detector calibration may prove infeasible.
s. 15|27
User Manual: POD-064-ENG R05