Dräger Polytron Ex, Instructions For Use Manual, Page: 5 / 39

9023744 - 3rd edition - October 2005
Page 5 of 40
Intended Use
Intended Use
— For stationary, continuous monitoring for concentrations of combustible gas/air
or vapour/air mixtures below the L ower E xplosive L imit (LEL).
— Transmitter with 4 to 20 mA interface enabling 3- or 4-wire technique.
— Transmitter Polytron Ex R (R = Remote) with remote sensing head SE Ex for ap-
plications where sensing head and transmitter have to be placed at different loca-
tions.
— Measuring range 0 to 99 % LEL or 0 to 9.9 % LEL
Depending on the Ex-sensor (Polytron Ex) resp. sensing head SE Ex (Polytron Ex R)
a measuring range of 0 to 99 or 0 to 9.9 % LEL can be realized.
Remark:
The measuring range 0 to 9.9 % LEL is displayed without a decimal point as an
integer value between 0 and 99.
— The sensing head SE Ex PR M ET resp. sensing head SE Ex LC M is connected
to the transmitter Polytron Ex R by means of a cable of max. 10 m length.
In conjunction with a central controller (e.g. Polytron or Regard):
● Alarm is activated before ignitable concentrations can form.
● Automatic initiation of counter measures which preclude the possibility of an
explosion.
● Special calibration mode (inhibition of alarms, one-man-calibration).
Type of transmitter Measuring range
0 to 99 % LEL
Measuring range
0 to 9.9 % LEL
Polytron Ex Ex-sensor PR M Ex-sensor LC M
Polytron Ex R Sensing head SE Ex PR M ET Sensing head SE Ex LC M