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Factory default settings
14.8.3 Setting DQ sensor latching
This function is only available without relays installed. This
function configures whether the DQ sensor must be
acknowledged after a measurement at higher concentration
than 100%LEL.
This setting does not apply for LC sensors.
1. Select Settings > Sensor > DQ Sensor latch. and
confirm.
The current setting is displayed.
2. Select Enable or Disable and confirm.
WARNING
Explosion Hazard
If sensor latching is disabled and an alarm indicating an
explosion hazard is acknowledged, the instrument informs the
end user of such hazard by having the red LED on the display
being continuously lit.
► Before acknowledging an over range, ensure that the gas
concentration has fallen under 100%LEL.
WARNING
Explosion Hazard possible
Operation non-compliant with BVS type examination.
If DQ sensor latching is disabled, for safe operation in
accordance with BVS 13 ATEX G 001 X, the control unit must
support this function.
► Make sure that over range latching is active at the control
unit.
14.9 Sensor settings Polytron
14.9.1 Gas settings
This function sets the gas type, measuring range and units of
measurement. Only certain sensors support these settings.
1. Select Settings > Sensor > Gas setting and confirm.
The current measured gas is displayed.
2. Select a measured gas from the list and confirm.
The current unit of measurement is displayed.
3. Select the unit of measurement from the list and confirm.
If the unit of measurement is set to %LEL, %UEG, or
%LIE, the category will be displayed. Continue with
step 4.
Otherwise the current full scale deflection is displayed.
Continue with step 6.
4. Select a category and confirm.
5. Set the LEL value and confirm.
6. Set the full scale deflection and confirm.
The new full scale deflection is displayed.
7. Select Next and confirm.
An overview of the new gas settings is displayed.
8. After review, select Back to menu or Confirm.
Back to menu
Confirm
9. Check the alarm settings after changing the category or
the LEL value.
15
15.1 Fixed settings for relays, LED and
Fault relay
Yellow Fault LED
Red Alarm LED
Alarm Hierarchy
®
87x0 IR
15.2 Settings which can be changed via
15.2.1 Polytron
Menu
Relay active on
alarm / No alarm
A1 alarm: direction Rising (falling for
A2 alarm: direction Rising
A1 latch mode
A2 latch mode
A1 acknowledg-
ment mode
A2 acknowledg-
ment mode
Select Back to menu for leav-
ing the function without
changes and confirm with
[OK].
Select Confirm to accept the
settings and confirm with
[OK].
Factory default settings
alarm
Setting
Energized / Normally Open
Lit if a fault message is available
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.
A2 overrides A1 on the LED. However,
the A1 and A2 relays operate inde-
pendently. I.e. if A1 is acknowledgeable
and A2 is not, and the gas concentra-
tion 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 con-
dition continues to exist.
the menu
®
8xx0
Default setting
Active on alarm
O
Sensors)
2
Non-latching
Latching
Acknowledgeable
Not acknowledge-
able
Dräger Polytron
Range
On / Off
Falling / Rising
Latching / Non-
latching
Acknowledgeable /
Not acknowledge-
able / Pre-acknowl-
edgeable
®
8000 Series
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