Installing Equipment; Device Rack; Sensing Head - Dräger Polytron SE Ex PR NPT1 DD Instructions For Use Manual

Installing Equipment

Device Rack

– Installation in the safe, non-hazardous area.
Controller unit Polytron SE Ex:
– Attach to panel for device rack with 2 or 5 channel
modules.
Controller units Polytron SE Ex / REGARD Ex:
– Install in 19"-rack system for device rack up to 12
(Polytron) resp. 16 (REGARD) channel modules..
NOTICE
Ensure adequate ventilation
– Minimum distance to housing cover 50 mm.
If more than two device racks are stacked together
forced ventilation must be provided.
– Follow national regulations against risk of electric
shock.
Concerning any information about installation, commis-
sioning, operation, function and maintenance of the
controller unit Polytron SE Ex, please refer to the In-
structions for Use Polytron SE Ex central controller (or-
der-no. 90 23 207) which is attached with each delivery
of the device rack Polytron SE Ex.
Concerning any information about installation, commis-
sioning, operation, function and maintenance of the
controller unit REGARD, please refer to the Instructions
for Use REGARD (order-no. 42 05 746).
Information on the central unit REGARD-1 is provided in
the REGARD-1 instructions for use (order no.
45 08 592).

Sensing Head

Observe laws and regulations concerning electrical
equipment in potentially explosive atmospheres as
well as the approval conditions!
Orientation
Although the sensing heads Polytron SE Ex PR M1/2/3
DD and SE Ex PR NPT1 DD as well as Polytron SE Ex
HT M DD can be used in arbitrary orientation, preferably
they shall be mounted such that the sensor's gas en-
trance area is pointing downwards. If to be mounted at
the ceiling a mounting bracket must be used.
The sensing head Polytron SE Ex LC M1/2/3 DD and
SE Ex LC NPT1 DD shall always be mounted with the
sensor's gas entrance area pointing downwards.
– Install sensing head at a location with little vibration
and maximum temperature stability (avoid direct sun
irradiation) in the vicinity of a possible leak.
30
WARNING
– Consider the complete scope of environmental con-
ditions influencing the sensing head. Avoid external
influences such as splashing water, oil, corrosive
aerosols (salt sprays) etc. and the possibility of me-
chanical damage.
– The gas entrance area of the sensor must be pro-
tected against water, dust and mechanical damage.
Any kind of contamination has to be prevented. Es-
pecially it must be ensured that during painting work
the sensor's gas entrance area is blocked by paint.
– Leave at least 30 cm free space beneath the sensing
head to provide accessibility for calibration work. If
the sensing heads need to be mounted in lower po-
sitions, for maintenance purposes they should be
mounted in a removable way.
– If the sensing head is used for the detection of flam-
mable vapours, the ground clearance must be cho-
sen as small as possible, but accessibility during ca-
libration work must still be ensured. Where appropri-
ate, fit the sensing head so that it is removable.
Mounting of Sensing Heads
See also drilling measures page 46
Mounting of the sensing heads
Polytron SE Ex PR M1 DD and
Polytron SE Ex LC M1 DD by means of four screws
(diameter 4 mm) through the holes of the housing.
Mounting of the sensing heads
Polytron SE Ex PR M2 DD and
Polytron SE Ex LC M2 DD by means of four screws
(diameter 4 mm) through the holes of the housing.
Mounting of the sensing heads
Polytron SE Ex PR M3 DD and
Polytron SE Ex LC M3 DD by means of four screws
(diameter 6 mm) through the fixing lugs.
Mounting of the sensing heads
Polytron SE Ex PR NPT1 DD and
Polytron SE Ex LC NPT1 DD by means of two screws
(diameter 6 mm) through the fixing lugs.
Mounting of the sensing head Polytron SE Ex HT M DD
means of two screws (diameter 6 mm) through the fixing
lugs.