Functional Description; Intended Use; Intended Area And Conditions Of Use; Approvals - Dräger Polytron 8000 Instructions For Use Manual

Description
2.2

Functional description

2.2.1 Principle of operation of the DrägerSensor
The electrochemical DrägerSensor EC are electrochemical
transducers for measuring the partial pressure of a gas under
atmospheric conditions.
The ambient air diffuses through a membrane in the liquid
electrolyte of the sensor. A measuring electrode, a counter-
electrode and a reference electrode are in the electrolyte.
An electronic potentiostat circuit maintains a constant electrical
voltage between the measuring electrode and the reference
electrode. The voltage, the electrode and the electrode material
are selected to enable the monitored gas to be electrochemically
converted at the measuring electrode. The electrons flowing
during the reaction are a gauge for the gas concentration.
There is an electrochemical reaction with oxygen from the
ambient air at the counter electrode at the same time.
2.3

Intended use

The Dräger Polytron 8000 is an explosion-proof device for
continuous monitoring of toxic gases or oxygen in the ambient
air, corresponding to the integrated DrägerSensor. 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
signaling). The device is designed for fixed installation and is
approved for use in potentially explosive atmospheres,
see chapter 2.5 on page 6.
WARNING
!
Not tested in environments with an elevated oxygen
content (>21 % O
2
Danger of explosions! Do not use in environments with
an elevated oxygen content. None of the Polytron
8000 instruments is certified or approved for operation
in environments with an elevated oxygen content.
®
1 DrägerService is a registered trademark of Dräger.
6
).
2.4

Intended area and conditions of use

® 1
Hazard areas classified into zones:
EC
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. The temperature range
specified for the device must be observed.
Hazard areas classified into divisions:
The device is only designed for use in potentially explosive
atmospheres of Classes I&II, Div. 1 or 2, 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.
The temperature range specified for the device must
be observed.
2.5

Approvals

See printed version for device marking.
2.6

Device marking

The device marking is supplied with the device as a copy on
a separate document.
Key to the Serial Number: The third letter of the Serial Number
specifies the year of manufacture: D = 2012, E = 2013, F = 2014,
H = 2015, J = 2016, K = 2017 etc.
Example: Serial Number ARDH-0054: The third letter is D,
i.e. the device was manufactured in 2012.
Sample
Dräger Polytron 8000