6 Dräger Polytron 8700/8720
Description
2.2 Functional description
The device is operated from a 10 to 30 volt DC supply.
The current gas concentration, status messages and menu
items are shown on a backlit LCD display and by three colored
LEDs. The measured gas concentration is output as a 4 to
20 mA analog signal or a digital HART
®
signal
1
After the power
is switched on, the device detects whether the 4-20 mA
interface is to be operated as a current source or a current
sink. The flexible design permits fitting even in places that are
difficult to access. The Dräger PIR 7000/7200 can be fitted on
either side of the of the equipment and installation with up to
30 m between the sensing head and the PIR 7000/7200 is
possible. In the variant with the integrated e-Box with the
"increased safety" protection class, the device can be easily
connected to the electrical field wiring. The device can be
configured, calibrated and serviced without declassification of
the area.
2.3 Intended use
The Dräger Polytron 87x0 is an explosion proof transmitter for
continuous monitoring of the concentration of gases and vapors
containing hydrocarbons or carbon dioxide. The housing for the
device consists of robust, non-corroding stainless steel or
aluminum and is suitable for indoor or outdoor applications.
The unit can be connected to a Dräger monitoring system or
a programmable logic controller (PLC) by means of a sealed
conduit or an appropriately approved cable gland. With the
optionally integrated relay module, the device can be operated
without a central controller (with additional local alarm
signalling). The device is designed for fixed installation and is
approved for use in potentially explosive atmospheres,
see chapter 2.5 on page 6.
2.3.1 Dräger Polytron 8700 with PIR 7000 infrared gas
sensor Types 334 and 340
For monitoring flammable gases and vapors containing
hydrocarbons
z Measuring range of Type 334 (IDS 01x1): 0 to 20 up to
100 %LEL
2
, for CH
4
(methane) also 0 to 100 vol.%
z Measuring range of Type 340 (IDS 01x2): 0 to 5 up to
100 %LEL
2
2.3.2 Dräger Polytron 8720 with PIR 7200 infrared gas
sensor Type CO
2
For monitoring carbon dioxide.
z Measuring range (IDS 01x5): 0 to 0.2 up to 30 vol% CO
2
2.4 Intended area and conditions of use
Hazardous areas classified by zones:
The device is only designed for use in Zone 1 or Zone 2
potentially explosive atmospheres for which a temperature
range as specified on the device must be observed and in which
gases of Explosion Groups IIA, IIB or IIC and Temperature
Classes T4 or T6 (depending on maximum ambient
temperature) or dust of Groups IIIA, IIIB or IIIC may occur.
Hazardous areas classified by divisions:
The device is only designed for use in potentially explosive
atmospheres of Classes I&II, Div. 1 or 2, for which
a temperature range as specified on the device must be
observed and in which gases or dust of Groups A, B, C, D or
E, F, G and Temperature Classes T4 or T6 (depending on
maximum ambient temperature) may occur.
2.5 Approvals
See printed version for approval markings.
2.6 Device marking
The device marking is reproduced on a separate document
shipped with the device.
Key to the Serial Number: The third letter of the Serial Number
specifies the year of manufacture: A = 2009, B = 2010, C = 2011,
D = 2012, E = 2013, F = 2014, H = 2015, J = 2016, K = 2017 etc.
Example: Serial Number ARBH-0054: The third letter is B,
i.e. the device was manufactured in 2010.
1HART
®
is a registered trademark of HCF, Austin, Texas, USA
WARNING
To prevent ignition of explosive atmospheres, strictly
follow the warnings below:
Not tested in oxygen enriched atmospheres (>21%
O2). High off-scale readings may indicate an explosive
concentration.
Exchanging components may compromise the intrinsic
safety. This only applies if the device is intrinsically
safe.
2 Lower Explosive Limit depending on the substance and the locally
applicable regulations.
!
WARNING
Explosive. Not to be used in oxygen enriched
atmospheres. None of the Polytron 8000 transmitters
is certified and approved to be operated in oxygen
enriched atmospheres.
!
D
Polytron 8700
ITR 0421
Dräger Safety 23560 Lübeck, Germany
II 2G
II 2D
WARNING: Do not open when energized
I
S
F
S
I
E
A
D
L
C
9N54
0158
Class I, Div 1, Groups A,B,C,D | Class II, Div 1, Groups E,F,G
Class I, Zone 1, Group IIC | T-Code T6/T4 | Type 4X | C22.2 No. 152
Supply: 10...30 VDC, 0.1...0.75 A | Relays: 5 A, 30 VDC or 230 VAC
CAUTION: Do not open cover. Opening
cover with circuits alive provokes risk of
Ignition of Hazardous Atmospheres.
W
ARNING: To reduce the risk of Ignition
of Hazardous Atmospheres, the conduit
must be sealed within 18’’ of the enclosure.
WARNING: Read Manual before operating.
Gas Detector for Use in Hazardous Locations as to
Fire, Electrical Shock and Explosion Hazards only
Part No: 4544638
Serial No. XXXX-9999
Ex d IIC T6/T4 Gb
Ex tb IIIC T80/130°C Db
-40°C ≤ Ta ≤ +40/+80°C
PTB 11 ATEX 1005X
IECEx PTB 11.0005X
IP6x | P ≤ 5 W
To Next Page
Loading...
Need help?
General
