5.2 Alarm Status Display of the currently pending alarms in plain text in the order of their arrival. Only those sensor
heads are displayed, where at least one alarm is active.
Alarms in latching mode (latching mode is only valid for certain DGS types, DGS-PE) can be
acknowledged in this menu (only possible if the alarm is not active).
Alarm Status
DP 1
“A1
Gasfree state
ascertained?
Symbol Description Function
DP 1 Sensor head No.
DP 1: Sensor 1
DP 2: Sensor 2 (2-sensor variant only)
‘A1
‘‘A1
Alarm status
‘ = Alarm active
‘’ = Alarm in latching mode, can be acknowledged
1 = Relays 1 = Warning relay
3 = Relay 3 = Critical relay
5.3 Relay Status Reading of the current status of alarm relays.
The actual relay status is displayed, depending on the relay mode (energized <> de-energized).
Selection of alarm relay:
Alarm Relay
Status
Alarm Relay 1
Status OFF
Symbol Description Function
1 Alarm Relay
1 = Relays 1 = Warning relay
2 = Buzzer
3 = Relay 3 = Critical relay
OFF Relay Status Relay OFF = coil de-energized
ON Relay Status Relay ON = coil energized
Selection of the next alarm relay
Note: Relay 3 is used for critical alarm indication. Relay 1 may be configured for critical alarm indication with the
2-sensor variant. A critical alarm relay has a Normally Closed contact set which indicates an alarm if the power to
the DGS is lost. In the table above the relays status refers to energizing of the coil, which activates the contact set.
Hence, for a critical relay in normal operation the coil is energized, causing the contact set to open and the relay
status to read “ON”. In the alarm condition, the coil is de-energized, causing the contact set to close and the relay
status to read “OFF”.
5.4 Menu Measuring Values
In this menu, the display shows the measuring value with gas type and unit.
Measuring Values 1 R744 ppm
A ! 450
Symbol Description Function
1 Actual MODBUS address 1: MODBUS address = 1
R744 Gas type Display of gas type (must comply with gas type of sensor head)
ppm Gas unit Unit
51.0 °C Measured value Current value of the gas concentration
A! Alarm indication At least one alarm has been released at this sensor head
# Maint. info Sensor head: maintenance due (maintenance date exceeded)
? ConfigError Gas type or meas. range does not comply with sensor head
Comm. err. Fault sensor head Communication error, sensor head <> I/O board
Underrange
Overrange
Meas. range monitoring
Meas. signal < admissible range (< zero point – 6 %)
Meas. signal > admissible range (> full scale value + 6 %)
Warm-up Warm-up time Warm-up time of the sensor is active
Selection of the next sensor head
The actual analogue output value in voltage and milliampere.
AO Value
10.0 V 20.00 mA
User Guide | Danfoss Gas sensor, type DGS
© Danfoss | Climate Solutions | 2022.01 BC291049702513en-000201 | 13
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