3.1 Calibration steps
3.2 Zero calibration
Prior to calibration, the sensors must be supplied with power voltage without interruption for run-in
and stabilization.
The run-in time depends on the sensor element and is shown in the following tables, as well as the
other relevant information:
First enter in Service Mode
1. Press Enter to enter in the menu and press down arrow until the Installation & Calibration menu
2. Press Enter and Service Mode OFF is shown
3. Press Enter, enter the password ****, press Enter and down arrow to change the status from OFF to
ON and then press Enter again.
When the unit is in Service Mode the display yellow LED is blinking.
From the Installation & Service menu, by using the down arrow scroll until the Calibration menu and
press Enter.
The type of gas sensor is displayed.
By using the Enter and up/down arrow keys set the calibration gas concentration in ppm:
• for CO2 sensor, select 10000 ppm which corresponds to 50% of the sensor measuring range
• for HFC sensor, select 1000 ppm which corresponds to 50% of the sensor measuring range
• for PE sensor, select 250 ppm which corresponds to 50% of the sensor measuring range
Select the Zero calibration menu.
In case of CO2 sensor, the Zero Calibration has to be executed by exposing the sensor to pure
Nitrogen, same gas flow.
Before executing the zero calibration the specified warm-up times must be strictly observed before
starting the process.
Connect the calibration gas cylinder to the sensor head by using the calibration adapter 148H6232.
Open the calibration gas cylinder flow regulator.
During calculation an underscore in line two, runs from left to right and the current value drops to zero.
When the current value is stable press Enter for saving the calculation of the new value.
“SAVE“ is displayed, as long as the function is executed.
After the value has been successfully stored, a square appears on the right for a short time = zero
point calibration is finished and new zero offset has been stored with success.
The display automatically goes to the display of the current value.
Sensor Element
Gas
Run-in time
calibration (h)
Warm-up
time (s)
Flow rate
(ml/min)
Gas application
time (s)
Infrared
Carbon dioxine
1
30
150
180
Semiconductor
HFC
24
300
150
180
Pellistore
Combustible
24
300
150
120
Fig. 3
Operating Guide | DGS functional tests and calibration procedure
© Danfoss | Climate Solutions | 2022.10
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