KRAL BEM 100 - Selecting the Mode for Volume Measurement; Specifying the Reference Temperature for Temperature Compensation; Smoothing the Indication; Selecting the Mode for Pulse Evaluation

9 Operation
9.1 Carrying out the basic settings
9.1.4 Selecting the mode for volume measurement
The parameter "Flow_Metering_Mode" is used to control the form in which the processing unit outputs
the measured volumes. Three modes are available.
Value Description
0 Pure measured value, without correction
1 Measured value with temperature compensation
2 Measured value converted into mass [kg]
Tab.23: Parameter "Flow_Metering_Mode"
Set the parameter "Flow_Metering_Mode" to0,1 or2.
9.1.5 Specifying the reference temperature for temperature compensation
The parameter "X_Temperature" is used for correction calculation of the density. This correction is
called temperature compensation.
The current density of the pumped liquid is calculated by means of the measured temperature of the
flowing pumped liquid and of the stored density table. This ensures that measuring errors caused by
changes in the density due to temperature variations are avoided.
Value Description
15 Reference temperature [°C] for correction calculation of the density values
(standard value = 15°C)
Tab.24: Parameter "X_Temperature"
Enter the reference temperature in the parameter "X_Temperature".
9.1.6 Smoothing the indication
A strongly fluctuating flow rate causes the jumping display values, making an interpretation by the user
difficult. The averaging function reduces this effect by generating an averaging across several meas-
ured values.
The following table shows how the number of measured values used for average-value generation af-
fects the response time. The response time is defined as that time in which a jumping change of the
pick up frequency (=flow rate) is mapped completely in the parameter "Avg_Flow_Rate".
Number of measured values for averaging Response time [s]
0 or 1 1/16
2 1/8
16 1
100 10
200 20
500 50
1000 100
Tab.25: Parameter "Avg_Flow_Nb_Samples"
Enter the number of measured values for averaging in the parameter "Avg_Flow_Nb_Samples".
9.1.7 Selecting the mode for pulse evaluation
Recognition of the flow direction is controlled via the parameter "Pulse_Type". Two modes are avail-
able.
Value Description
0 Encoder mode:
The processing unit evaluates two pick ups which allows it to recognize the flow direction.
1 Counter mode:
The processing unit evaluates only one pick up. A recognition of the flow direction is not
possible.
Tab.26: Parameter "Pulse_Type"
Set the parameter "Pulse_Type" to0 or1.
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OIE 26en-GB Edition 2021-08
Operating instructions