Operation
VA 550 English V1.21 Page 34 of 53
8.3.1.4 Definition of the reference conditions
Here can be defined the desired measured media reference conditions for pressure and temperature
and times for the filter and averaging.
• Factory pre-setting for reference temperature and reference pressure are 20 °C, 1000 hPa
• All volume flow values (m³/h) and consumption values indicated in the display are
related to 20 °C and 1000 hPa (according to ISO 1217 intake condition)
• Alternatively 0 °C and 1013 hPa (=standard cubic meter) can also be entered as a reference.
• Do not enter the operation pressure or the operation temperature under reference
conditions!
Setup → Sensor Setup→ Advanced
Setup → Sensor Setup → Advanced → Ref.Pref
Setup → Sensor Setup→ Advanced →
Ref.Temp
To make changes, first select a menu with button
„>“ and confirm selection by pressing „OK“ .
In order to change, e.g. the unit, first select by
pressing key „>“ the field “Units” and then key
“OK”.
Select with the key „>“ the correct unit and then
confirm selection by pressing 2x „OK“.
Input / change of the value by selecting the
respective position with button „>“ and entering by
pressing button „OK“ .
By pressing „>“ the position value is incremented
by 1. Complete with "OK" and activate next
number position.
Procedure for changing the reference temperature
is the same.
Under point "Filtertime" together with the
appropriate "Filter Grade" an attenuation can be
defined.
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