9023744 - 3rd edition - October 2005
Page 7 of 40
Hints for Safe Use
Hints for Safe Use
Transmitter Polytron Ex
The transmitter Polytron Ex is intended to be used for the detection of flammable
gases and vapours under atmospheric conditions. The Ex-sensor is connected to the
intrinsically safe terminals K11, K12, and K13.
Only an Ex-sensor approved by its own is allowed to be connected to the terminals
K11, K12 und K13 of the transmitter Polytron Ex. Installing the Ex-sensor it has to be
ensured that a protection class of at least IP 20 acc. to EN 60 529 is maintained.
It is not allowed to install a connecting cable between Ex-sensor and transmitter. For
this purpose exclusively the Polytron Ex R transmitter is suitable.
Non-observance will affect the ex-approval!
Transmitter Polytron Ex R
The transmitter Polytron Ex R is intended to be used for the detection of flammable
gases and vapours under atmospheric conditions. The sensing head is connected to
an inseparably connected cable.
It is not allowed lengthen the 10 m connecting cable of this intrinsically safe circuit.
Non-observance will affect the ex-approval!
Transmitter Polytron Ex and Ex R
The non-intrinsically safe power supply and signal transmission (current loop 4 to
20 mA) is possible by means of one 3-wire or two 2-wire cables which are connected
to the terminals K1, K2, K3, and K4 within a terminal box of protection type "e". The
measured value is readable on a display.
At the non-intrinsically safe terminals of the transmitters Polytron Ex resp. Ex R only
electrical devices may be connected which even in case of failure have no voltages
of higher than 250 V AC.
The transmitters Polytron Ex and Polytron Ex R must not be operated at tempera-
tures lower than –40
o
C or higher than 65
o
C.
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