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U426_flowtherm Ex_B_e_171206
19/34
5.3.10.2
Standard atmospheric pressure
Input value in hPa
5.3.10.3
Standard density
Input value in kg/m³ depending on set standard conditions for calculating the mass flow rate.
5.3.11
VA – Pairs of values
Menu -> Settings -> Sensor -> VA Input -> Pairs of values
If pairs of values is selected (see 5.3.7.1), then the values stored here for determining the measured
value are applied as a calibration curve.
Selection: Configuration = enter the quantity of pairs of values (minimal 2, maximal 30) for pro-
cessing and display
Pairs of values = display and change of pairs of values.
A pair of values always consists of a velocity value in m/s and a frequency
value in Hz.
The condition being: the pairs of values must be ever increasing, i.e. the
next velocity and frequency value must always be greater than the
previous one.
Example for quantity = 03
01:000.50m/s, 00010Hz
02:010.00m/s, 00350Hz
03:040.00m/s, 01770Hz
If the frequency measured value is greater than in the last pair of values, then the velocity value is
calculated. However, this means that the measurement uncertainty increases as this value is then outside
the calibrated range.
Settings for thermal sensors TA:
5.3.12
TA – Basic settings
Menu -> Settings -> Sensor -> TA Input ->
Basic settings
The connected thermal sensor determines the parameter type.
5.3.12.1
Type
Setting the type of thermal sensor:
Refer to the relevant technical documents for selection options.
Selection: KKZ
= the calibration number (KKZ) is individually determined for each sensor
and modifies the basic characteristics.
KKZ: enter as a 14-digit figure, in which each digit has a 0..9..A..F range
(hexadecimal = 16 possible variables).
The actual KKZ can be found in the technical data sheet, calibration
certificate or directly on the sensor
Pairs of values = special calibration characteristic specifically matched to the measuring task
based on up to 30 supporting points. Entering or amending the points, see
under 5.3.15.
The actual pairs of values can be found in the technical documents.
