Dräger Polytron 8720 User Manual

Settings menu
Dräger Polytron 8700/8720 19
Overview of standard alarm settings (for Polytron 8700
with PIR 7000, configured for methane, full scale reading
of 100 %LEL)
The function for setting the A1 hysteresis is opened.
This function permits the setting of a zone within which
a triggered relay maintains its status until the gas concentration
is outside the zone. This function prevents relays from
chattering at an alarm threshold.
Example: A2 at 40 %LEL methane
Maximum possible hysteresis: 3 %LEL
Alarm activation at measured values ≥40 %LEL
Alarm deactivation at measured values ≤37 %LEL (40 %LEL -
3 %LEL)
11. Select the line for entering the hysteresis and confirm.
12. Set the hysteresis for A1 and confirm.
The hysteresis setting for A1 is displayed.
13. Select Next and confirm.
The settings for A1 are displayed.
14. Select and confirm with Confirm.
The settings for the A1 alarm are now complete.
Testing Alarm A1
This function simulates the A1 alarm status.
1. Select Settings > Instrument > Alarm > Set Alarm A1
and confirm.
2. Select On or Off and confirm.
When the function is activated, the relay and the interface are
set to the A1 alarm status and the red LED gives single flashes.
Testing Alarm A2
This function simulates the A2 alarm status.
1. Select Settings > Instrument > Alarm > Set Alarm A2
and confirm.
2. Select On or Off and confirm.
When the function is activated, the relay and the interface are
set to the A2 alarm status and the red LED gives double flashes.
Testing Fault status
This function simulates the Fault alarm.
1. Select Settings > Instrument > Alarm > Set fault
and confirm.
2. Select On or Off and confirm.
When the function is activated, the Fault relay and the 4-20 mA
interface are set to the fault current and the yellow LED lights.
A1/Relay 1 A2/Relay 2
Alarm threshold 20 %LEL 40 %LEL
Hysteresis 0 %LEL 0 %LEL
Relay Normally
energized
Normally
energized
Relay alarm:
Direction
Rising Rising
Latching mode Non-latching Latching
Acknowledgement
mode
Acknowledgeable Not
acknowledgeable
NOTICE
When the function Set Alarm A1 is exited in the menu,
the Polytron 87X0 reverts automatically to measurement
mode.
NOTICE
When the function Set Alarm A2 is exited in the menu,
the Polytron 87X0 reverts automatically to measurement
mode.
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NOTICE
When the function Set fault is exited in the menu,
the Polytron 87X0 reverts automatically to measurement
mode.
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Dräger Polytron 8720 Specifications

General

Brand	Dräger
Model	Polytron 8720
Category	Measuring Instruments
Language	English