Use; Prerequisites - Dräger Flame 2000 Notice D'utilisation

en

Use

3 Use
3.1

Prerequisites

Installation should comply with NFPA 72 or any other local and
international regulations and standards, as applicable to flame
detectors and installation of Ex approved products.
To ensure optimal performance and an efficient installation, consider
the following guide lines:
Sensitivity

To determine the level of sensitivity, consider the following:
Size of fire at the required distance to be detected

Type of flammable materials

Wiring

The wire gauge must be designed according to the distance

from the flame detector to the controller and the number of
flame detectors on the same power line. For more information
on wire gauges, please refer to the Technical Manual.
To fully comply with EMC directive and protect against

radiofrequency interference (RFI) or electromagnetic
interference (EMI), the cable to the flame detector must be
shielded and the flame detector must be grounded. The shield
should be grounded at the flame detector end.
All cables to the flame detector must be well shielded to

comply with EMC requirements.
Use suitably rated blind plugs for all unused entries.

Ground the flame detector to the nearest ground point (not

more than 3 m (10 ft.) from the detector location).
Install the flame detector with the cable entries placed down-

wards.
10
Cable gland/conduit Installation

The cable gland/conduit used for the cabling must comply with the
following:
To avoid water condensation in the flame detector, install the

flame detector with the cable gland/conduit (and drain holes)
placed downward.
When using the tilt mount, use flexible cable glands/conduits

for the last portion connecting to the flame detector.
For installations in atmospheres as defined in group B of the

NFPA 72, seal the cable gland/conduit inlets.
When pulling the cables through the cable gland/conduit,

ensure that they are not tangled or stressed. Extend the
cables about 30 cm (12") beyond the flame detector location
to accommodate wiring after installation.
For conduit installations only:

To reduce the risk of ignition of hazardous atmospheres, the
conduit must be sealed within 45 cm (18") of the enclosure.
Spacing and location

The number of flame detectors and their locations in the protected
area are determined by:
Size of the protected area

Sensitivity of the flame detectors

Obstructed lines of sight

Cone of view of the flame detectors

Environment

Dust, snow, or rain can reduce the flame detector sensitivity

and require more frequent cleaning work.
The presence of high intensity flickering IR sources may affect

sensitivity. In this case, either position or settings of the flame
detector must be adapted.