Electrical Installation; Connection Between Polytron Se Ex Pr M1/2 Dq Or Se Ex Lc - Dräger Polytron SE Ex PR M1 DQ Gebrauchsanweisung

Polytron SE Ex PR NPT1 DQ
Polytron HT M DQ
For further information, see the following chapter: "Dimensions and drilling
dimensions", page 43.
4.2

Electrical installation

Comply with regulations on electrical equipment in explosion-hazard areas and
with approval conditions!
The sensing head housing has been tested in accordance with IP 66. When
the cover is securely tightened and suitable cable entries are being used, this
protection can be maintained under normal operating conditions. A minimum
protection of IP 65 must be ensured, however.
IP protection ratings do not cover the device being used to measure gas during
or after it has been exposed to these conditions. In the event of dust deposits
and immersion/water jets, check the calibration and the correct functioning of
the device.
4.2.1 Connection between Polytron SE Ex PR M1/2 DQ or
SE Ex LC M1/2 DD sensing heads and rack or
transmitters
– With 3-wire, shielded line, shield braiding with 80% coverage. Max. outer
diameter: 12 mm.
– Connect the shielding to the cabinet or switchboard earth as closely as
possible.
– The cable gland is approved for fixed-location installation only. It is suitable
for line diameters of 7 to 12 mm. The thread of the cable gland is M 20 x 1.5.
– Place the cable shielding around the plastic cone on the cable gland as
shown in the figure, and insert into the metal cable gland. Tightening the
cable gland means that the shielding is in electrical contact with the
conductive inner lining of the sensing head.
2 screws (6 mm diameter), through
the fastening lugs
~45 mm
a
c
The housing of the Polytron SE Ex PR M2 DQ or SE Ex LC M2 DD sensing
heads are equipped on the underside with an explosion-hazard approved plug
that can be replaced with the cable gland if required. This means that the cable
can be inserted into the sensor from below. This replacement must be carried
out before mounting/installation.
Installation & commissioning
b
~12 mm
d