Setting Fault Relay Warm-Up; Alarms; Alarm Hysteresis; Configuring Alarms - Dräger Polytron 5000 Série Mode D'emploi

en Instrument settings
Normally ener- The relay contact is energized during nor-
gized mal operation and changes if an alarm is
A1/A2 ENERG triggered. At a loss of power this triggers an
- ON alarm (fail-safe).
Energ. on If an alarm is triggered, the relay contact is
alarm energized.
A1/A2 ENERG
- OFF
1. Select A1 - ENERG - OFF / ON or A2 - ENERG - OFF /
ON.
 The display toggles between the current value and the
menu item.
2. Tap [OK]
 The value flashes (data entry mode)
3. Change the value
● Tap [UP] for Energized on alarm (OFF)
● Tap [DOWN] for Normally energized (ON)
4. Confirm with [OK]
The value is set and the instrument returns to the menu.

12.2.2 Setting fault relay warm-up 1

This function is used to set operation of the fault relay during
warm-up 1 to indicate the warm-up 1 state on the relay output.
Static The fault relay triggers a connected alarm
FAIL-FREQ- indicator permanently.
Stdy The orange LED is lit continuously.
Dynamic The fault relay switches state for 9 seconds.
FAIL-FREQ- Example:
PULS
– A horn is connected to fault relay output
Normally Open.
– Relays are configured as normally ener-
gized.
 The horn and the orange LED of the
transmitter are 1 second active and 9
seconds in-active.
1. Select FAIL-FREQ-Stdy / PULS.
 The display toggles between the current value and the
menu item
2. Tap [OK]
 The value flashes (data entry mode)
3. Change the value
● Tap [UP] for Static (Stdy)
● Tap [DOWN] for Dynamic (PULS)
4. Confirm with [OK]
The value is set and the instrument returns to the menu.

12.3 Alarms

12.3.1 Alarm hysteresis

The hysteresis function defines an interval where a triggered
relay maintains its status until the gas concentration is outside
the defined interval. Example: Alarm threshold is set to 40
ppm and hysteresis to 3 ppm. The alarm stays active until the
value falls under 37 ppm. This prevents relays from chattering
at an alarm threshold.
A fixed hysteresis of 5% of full scale is programmed.

12.3.2 Configuring alarms

Setting the alarm threshold
The lowest alarm threshold is one display unit of gas
depending on the configured sensor type.
1. Select A1 - set or A2 - set
 The display toggles between the current value and the
menu item.
2. Tap [OK] and set value for alarm threshold.
 The value flashes (data entry mode)
3. Confirm with [OK]
The value is set and the instrument returns to the menu
Setting the alarm direction
Rising (ris) The alarm direction is called rising, if the
gas concentration has to exceed a certain
value to activate an alarm.
Falling (FALL) The alarm direction is called falling, if the
gas concentration has to fall below a certain
value to activate an alarm.
1. Select A1 - ris / FALL or A2 - ris / FALL
 The display toggles between the current value and the
menu item.
2. Tap [OK]
 The value flashes (data entry mode)
3. Set the alarm direction.
● Select [UP] for falling (FALL)
● Select [DOWN] for rising (ris)
4. Confirm with [OK]
The value is set and the instrument returns to the menu
Setting the alarm latching or non-latching
Latching (Lat) Once the alarm level is reached, the instru-
ment will trigger the alarm. It will remain in
alarm status even if the gas concentration
does not meet the alarm condition any
more. To clear a latching alarm it has to be
acknowledged.
Non-Latching The alarm status clears if the gas concen-
(nLat) tration does not meet the alarm condition
anymore.
1. Select A1 - Lat / nLat or A2 - Lat / nLat
 The display toggles between the current value and the
menu item.
2. Tap [OK]
 The value flashes (data entry mode)
3. Set latching mode.
● Select [UP] for non-Latching (nLat)
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Dräger Polytron 5000 Series