Special States; Ending Special States - Dräger Polytron 8000 Serie Notice D'utilisation

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Operation

8.1.2 Special states

If the instrument is in a special state, a proper measurement
or alarming can no longer be guaranteed.
This is the case:
– When the gas concentration exceeds the measuring
range.
– When a fault occurs.
– When alarms are deactivated.
The measuring function (display output and analog/digital
interface) remains active.
– During calibrations.
– During bump tests.
– During warm-up phase.
– During maintenance.
For the current of the analog interface corresponding to the
analog signal, see 17.2.
For signals of digital interfaces, refer to the corresponding
technical manual.
Display example Description
Value is over measuring range
The gas concentration is beyond the
measuring range of the sensor
Analog interface: Measuring range
O 2 A2
exceeded
Relays: A2 relay switches
Information for Polytron 8310 and
Polytron 8200:
The message that the measuring
range has been exceeded can also be
caused by a short circuit or an inter-
ruption in the line to a remote sensor.
Value is under measuring range
The gas concentration is beyond the
measuring range of the sensor.
Analog interface: Drift below zero
O 2 Vol.%
Relays: Fault relay switches
Fault indication
The
side of the display.
Analog interface: Fault current
Relays: Fault relay switches
Maintenance indication
20.9
The
side of the display.
This is displayed when alarms are
O 2
Vol.%
deactivated, during calibrations, bump
test and maintenance work.
Analog interface: Maintenance cur-
rent
Relays: No change
Warning indication
20.9
The
side of the display.
Analog interface: Warning current
O 2
Vol.%
Relays: No change
16
1)
.
symbol is displayed on the right
symbol is displayed on the right
symbol is displayed on the right
1) If the gas concentration exceeds the full scale deflection, the display
continues to indicate the measured value with the indicator "Measur-
ing range of the analog interface exceeded"
2) Only when warning current is enabled. Factory default setting: dis-
abled.
Warm-up phase 1
The symbol is displayed on the right side of the display.
The remaining time is indicated on the left side of the display.
Analog interface: Maintenance current
Relays: Fault relay switches
For warm-up phase 1, the fault relay behavior is configurable
(see "Setting fault relay warm-up 1", page 25)
Warm-up phase 2
The symbol is displayed on the right side of the display.
The measured value is indicated on the left side of the display.
Analog interface: Measured value
Relays: Behavior as in measuring mode (Fault relay does not
indicate warm-up phase 2.)

8.1.3 Ending special states

Fault / warning indication
Faults and warnings are non-latching. If the fault or warning
condition clears, the message disappears.
To solve warning and fault conditions, display the error code
or warning message (see "Displaying Information", page 18)
and begin troubleshooting (see "Troubleshooting", page 21).
Value under/over measuring range
The display indicates that the gas concentration is beyond the
measuring range of the sensor. The indication disappears as
soon as the gas concentration is within the measuring range.
NOTICE
Sensor malfunction
Gas concentrations beyond the measuring range of the
sensor might cause sensor malfunctions.
► Check the calibration.
®
Polytron 8200 CAT with DQ sensor:
An over range has to be acknowledged with [OK] after
verifying that the gas concentration is below 100 %LEL (e.g.
using a portable instrument).
Latching alarms is the default setting of the instrument.
For instruments without relays, the over range can be set to
non-latching. In this case, the over range indication
disappears. The control unit must support this function! For
further information see: "Setting DQ sensor latching",
page 30.
2)
Instructions for use
.
®
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Dräger Polytron 8000 Series