Contrec 515 BR03, Operation Manual

Page: 62 / 110

Instrument Calibration
52 515 BR03 - 15 August 2021
CUTOFF FINP1
FINP2
The Cut-off is the lowest frequency for which the instrument continues
to calculate a rate from the flowmeter.
The value for the cut-off is specified as the frequency of the flowmeter in
Hertz.
Be careful when setting low cut-off values because the display update
time for the flow rate becomes very long. For example if the cut-off is set
to 0.01 Hz, and the measured flow stops, the instrument continues to
display the flow rate for 100 seconds before it can determine that the flow
has actually stopped.
FILTER FINP1
FINP2
Input fluctuations caused by pulsating flow tend to create distortion in the
input readings of the rate. The instrument has a digital filter that averages
out these fluctuations.
As a guide to the degree of filtering to use, the following table shows the
response time (in seconds) to reach 90% and 99% of a step change in
input.
The value A is the filter constant that the user can set.
Filter setting A Seconds to reach 90%
of full swing Seconds to reach 99%
of full swing
0 0 0
2 2 4
4 4 8
6 5 10
10 8 15
15 12 23
20 14 27
25 18 34
35 25 48
45 32 62
60 42 82
75 52 102
90 62 122
99 68 134
The input filter range is from 0 to 99. A setting of 0 (zero) means that
there is no filtering.
CORR FINP1
FINP2
If the input sensor has non-linear characteristics, select NON-LINEAR
to apply correction factors to the input signal.
Use or to select LINEAR or NON-LINEAR.
 
UNITS PARAMS
INPUTS
OUTPUTS ALARMS COMMS TM/LOG SETUP TEST END
SET