Intended Use; Hints For Safe Use - Dräger PEX 3000 Gebrauchsanweisung

Intended Use

Intended Use
The transmitter PEX 3000 is intended to be used for fixed installed continuous
monitoring for mixtures of flammable gases and vapours with air under
atmospheric conditions. The full scale range is 100 % or 10 % of the lower
explosive limit (LEL). The transmitter is connected to a suitable controller unit by
means of a 3-core-cable, the measurement signal during normal operation is
between 3.8 and 20.5 mA.
The Transmitter PEX 3000 type XTR 0090 and XTR 0091 (Remote-Version) is
intended to be used in combination with a remote Dräger sensing head, e.g.
Polytron SE Ex PR ... DD and HT M DD (100 %LEL) or Polytron SE Ex LC ... DD
(10 %LEL).
As the operation of the PEX 3000 in combination with the mentioned remote
sensing heads does not really differ from the operation of the PEX 3000 with built-in
sensors, they are not explicitly considered in these instructions for use. Likewise
also the operation of further housing types, e.g. of the types XTR 0001 and
XTR 0011 (drilling templates see page 57) is not explicitly described.
The transmitters must not be used at ambient temperatures lower than –40
For the transmitters PEX 3000 type XTR 0000, XTR 0001, XTR 0010, and XTR
0011 the maximum ambient temperature is depending on the temperature classes
o
and is 40 C for temperature class T6, 55
for temperature class T4.
For the transmitters PEX 3000 type XTR 0090 and XTR 0091 the permissible
maximum ambient temperature is 65
The transmitter is approved acc. to the device categories II 2G and II 2D and can
be operated in hazardous areas zone 1 and zone 2 as well as zone 21 and zone
22. Observe installation instructions.
Not to be used in oxygen enriched atmospheres.
In conjunction with a suitable controller unit with pre-adjusted alarm thresholds
acoustic and visible alarm devices or automatic countermeasures can be activated
before the detected gases or vapours can form dangerous flammable mixtures with
air.

Hints for safe use

Only certified sensors or sensing heads are allowed to be connected to the
terminals br/br, ge/yw, and sw/bk.
In potentially gas-explosive areas (zones 1 and 2) the energised transmitter is
only allowed to be opened for maintenance purposes.
IIn potentially dust-explosive areas (zones 21 and 22) there is no explosion
protection if the energised transmitter is opened. The Ex area has to be
temporary de-classified if necessary! Adequate provisions must be made.
Before closing the transmitter make sure the atmosphere is free of dust.
32
o
C for temperature class T5, and 65
o
C generally.
WARNING
WARNING
o
C.
o
C