Operation And Stabilisation - Danfoss DGS-SC Installation And Operation Manual

Installation and Operation Guide | DGS Modbus

5. Operation and Stabilisation

Stabilisation
On powering up it will sense for the presence of gas after an initial
warmup delay of 5 minutes. A Modbus service parameter is set
during the warm-up.
The typical time for various sensor types to stabilise is shown
below.
Sensor Type
Semiconductor (SC)
Infrared (IR)
On power up, semiconductor sensors output a signal voltage that
is over the + max scale, i.e., > 5V, and move towards zero as they
stabilise.
If sensors have been in long-term storage or the detectors have
been turned off for a long period, stabilisation is much slower.
However, within 1-2 hours sensors should have dropped below
the alarm level and be operational. You can monitor progress
exactly by monitoring the output (for example, 0-10V, or as other-
wise configured). When the output settles around zero the sensor
is stabilised. In exceptional circumstances the process can take up
to 24 hours or more.
Alarm condition
In alarm condition: (e.g. high gas level)
• the green LED stays on
• the red LED will be on
• the buzzer operates (if it has not been disabled and after a
delay if this option has been selected)
• the relay output activates (after a delay if this option has been
selected)
• the "Limit alarm" and "Warning limit al" is activated as appli-
cable (after a delay if this option has been selected)
• the voltage or current output changes proportional to gas
concentration
Fault condition
In fault condition: (e.g. sensing error)
• the green LED will be off
• the red LED will be on
• the applicable Modbus alarm is activated
• a voltage or current fault output will activate
2mA on the 4-20mA output
0.5V on the 1-5V output
1.0V on the 2-10V output
Manual control
It is possible to perform a manually control to verify the buzzer,
LED's and alarm relay, see Section 7.
© Danfoss | ADAP-KOOL® | 2016.12
Stabilisation Time
5 minutes
2 minutes
RS8HJ102 | 13