6
Verifying and calibrating measuring system
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5200-en_V2.0_06/20
6.6
Calibrating flow rate
For calibration you will need a reference flow meter set to SATP (Standard
Atmospheric Temperature and Pressure: 25°C, 1013 hPa) conditions. The
flow rate under normal operating conditions is about 4.8 l/min.
Prerequisites
• Calibration mode is activated.
• The device has been tested for leakage and verified.
• The device’s zero point has been checked.
• The aerosol sensor offset has been set.
Checking flow rate
1.
Detach the sampling head.
2.
Connect a suitable flow meter to the IADS tube inlet.
3.
Select
Main menu > expert user menu
(password
1-
).
4.
Select the button
suction pump/signals/digital IO.
5.
Compare the value
sensor flow rate
to the value measured with
the flow meter.
The flow rate under normal operating conditions is about 4.8 l/min. The
value determined using the flow meter should be 4.8 ± 0.15 l/min.
If the value determined using the flow meter deviates more than 0.15 l/min.:
4
Adjust the flow rate.
Adjusting flow rate
1.
Select
Main menu > expert user menu
(password
1-
).
2.
Select
sensor/calibration.
3.
Select
sensor calibration.
4.
Enter the flow rate displayed by the flow meter by
calibrate flow
sensor offset
.
Be aware of the decimal point.
5.
Confirm with
accept
.
6.
Check the flow rate again.
Enter the measured value again if the flow rate is not correct.