The Polytron 2 XP Ex is an explosion proof gas detector for continuous monitoring of
combustible gases and vapors in ambient air. The transmitter converts the signal from a catalytic
bead or IR sensor to a 4 to 20 mA analog or HART® or RS 485 digital signal output.
The unit is designed for one-man calibration, and offers a variety of diagnostics and self test
features. The configuration and calibration of the transmitter is menu guided and easy to perform,
using either the infrared remote control, the built-in push buttons, or a HART hand held
terminal. With the optional relays, Polytron 2 XP Ex can be operated as ‘stand alone’ unit.
Easy to install -
The enclosure provides two mounting
holes. For easy wiring, the electronics is
enclosed in a ‘bucket’, and can be pulled
out as one unit, held by a tether. The three
wire cable, fed through a sealed conduit, is
terminated in a pluggable connector at the
printed circuit board.
Draeger SafetySensor technology -
Polytron 2 XP Ex offers two sensing
principles: catalytic combustion or infrared.
The interior design of the catalytic bead
sensor offers an extremely high sensitivity.
Higher sensitivity also means shorter
response times, higher accuracy and
improved stability of the sensor signal. The
advanced poison resistant Draeger SafetySensor
PR has a significantly longer lifetime.
The Draeger SafetySensor IR is the sensor of
choice, where ‘poisonous’ gases might be
in the ambient air. Over time, these can
damage the catalyst of a catalytic bead
sensor, decreasing its sensitivity. In order
to reduce maintenance costs for recalibration
and exchange, the infrared technology
offers a superior solution.
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One man calibration -
All setup and maintenance can be
performed without opening the transmitter
or declassifying the hazardous area. An
infrared remote control, beaming through
the window, gives full access to the menu
and calibration procedure. The menu can
also be accessed using the built-in push
buttons or a HART hand held terminal. All
menu items and messages are displayed in
plain English. Other, user selectable languages
are French, Spanish and German.
Stand alone system -
With the three built-in relays, Polytron 2
XP Ex can be used as an independent
stand alone unit. Two adjustable gas alarm
levels and a fault alarm make it convenient
to switch warning devices on-site, without
having to run cables back and forth to a
central controller. The sensor signal can
still be transmitted using either the 4 to
20 mA, HART® or RS 485 signal output.
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