Dräger Polytron 8100, Инструкция по эксплуатации, Страница: 37 / 254

Sensor principle
Dräger Polytron 8100 37
7.2 Fixed settings
8 Sensor principle
Dräger electrochemical sensors are measuring the partial
pressure of gases under atmospheric conditions. The
monitored ambient air diffuses through a membrane into the
liquid electrolyte in the sensor. The electrolyte contains a
measuring electrode, a counter-electrode and a reference
electrode. An electronic potentiostat circuit ensures a constant
electrical voltage between measuring electrode and reference
electrode. Voltage, electrolyte and electrode material are
selected to suit the gas being monitored so that it is
transformed electrochemically on the measuring electrode and
a current flows through the sensor. This current is proportional
to the gas concentration.
At the same time, Oxygen from the ambient air reacts at the
counter-electrode electrochemically.
The current flowing through the sensor is amplified
electrochemically, digitized and corrected for several
parameters (e.g. the ambient temperature).
9 Disposing the instrument
Fault Meaning
Fault relay Energized / NO
Yellow Fault LED Lit if a fault message is available (see
Section 6.3 on Page 33).
Red Alarm LED
Single blink if A1 condition is present.
Double blink if A2 condition is present.
If an alarm is configured as
acknowledgeable and the alarm is
acknowledged, single/double blink
changes into continuously lit.
Alarm Hierarchy
A2 overrides A1 on the LED. However, the
A1 and A2 relays operate independently.
I.e. if A1 is acknowledgeable and A2 is
not, and the gas concentration is such that
it triggers A1 and A2: acknowledging will
cause the A1 relay to release. However,
the red LED will still double blink as long
as the A2 condition continues to exist.
Disposal of electrical and electronic equipment:
EC-wide regulations governing the disposal of
electrical and electronic appliances which have been
defined in the EC Directive 2002/96/EC and in
national laws have been effective since August 2005
and apply to this device.
Common household appliances can be disposed of
using special collecting and recycling facilities.
However, this device has not been registered for
household usage. Therefore it must not be disposed
of through these channels. The device can be
returned to your national Dräger Sales Organization
for disposal. Please do not hesitate to contact Dräger
if you have any further questions on this issue.
Disposal of electrochemical sensors:
To be disposed in accordance with the material
safety data sheet of the corresponding sensor.
WARNING
Danger of explosions! Do not dispose sensors in fire,
risk of chemical burns!
Do not open with force.
Observe the applicable local waste disposal
regulations. For information, consult your local
environmental agency, local government offices or
appropriate waste disposal companies.
!