Description
Dräger Polytron 8100 7
2.2 Intended use
The Dräger Polytron 8000 is an explosion proof instrument for
continuous monitoring of toxic gases or oxygen in the ambient
air. The instrument is housed in a rugged stainless steel or
aluminum enclosure for indoor and outdoor applications. The
instrument can be connected through a sealed conduit or
approved cable gland to a Dräger monitoring system or a
Programmable Logic Controller (PLC). With the optional alarm
relay configuration, the instrument can be operated as a stand-
alone unit. The instrument is designed to be installed in
permanent locations and is approved for use in hazardous,
classified areas, see Section 10.1 on Page 37. With the
optionally integrated relay module, the instrument can be
operated without a central controller (with additional local
alarm signaling).
For safe operation, the connection to a central controller is
necessary. This also applies if all relays are connected
because the fault relay is not activated during maintenance. In
any case, the analog output must be monitored because it
might indicate a special status by a current between 0 and 3.5
mA.
2.3 Intended operating area and conditions
Hazardous areas classified by zones:
The device is intended to be used only in hazardous areas
classified Zone 1 or Zone 2, within a temperature range as
marked on the device, where gases of explosion Groups IIA,
IIB or IIC and temperature class T4 or T6 (depending on the
maximum ambient temperature) or dusts of Groups IIIA, IIIB or
IIIC may be present.
Hazardous areas classified by divisions:
The device is intended to be used only in hazardous areas
Class I or II, Div. 1 or Div. 2, within a temperature range as
marked on the device, where gases or dusts of Groups A, B,
C, D or E, F, G and temperature class T4 or T6 (depending on
the maximum ambient temperature) may be present.
2.4 Design
The instrument is powered by 10 to 30 VDC (see Section 10.4
on Page 41). Gas concentrations, status messages, and menu
choices are displayed on a backlit graphic LC-display and 3
colored LEDs. The measured gas concentration is converted
to a 4 to 20 mA analog (per NAMUR recommendation NE43)
or a digital HART output signal. The instrument can be
operated as current source or sink.
Navigation through the menu is done by taping a magnetic
wand on the glass at the appropriate indicator.
The instrument can be configured, calibrated and maintained
non-intrusively without declassifying the area.
CAUTION
Not tested in oxygen enriched atmospheres
(>21% O2). High off-scale readings may indicate an
explosive concentration.
WARNING
Danger of explosions. Not to be used in oxygen
enriched atmospheres. None of the Polytron 8000
instruments are certified and approved to be operated
in oxygen enriched atmospheres.
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