HF126PEN_EG_IA_TP_v0501_04
Page 14
2 - FLOWRATE
The settings for total and flowrate are entirely separate. In this way, different units of measurement
can be used for each e.g. cubic meters for total and liters for flowrate.
The display update time for flowrate is one second or more.
Note:
these settings also influence the analog output.
MEASUREMENT UNIT
21
SETUP - 21 determines the measurement unit for flowrate.
The following units can be selected:
mL - L - m3 - mg - g - kg - ton - GAL - bbl - lb - cf - REV - no unit -
scf - Nm3 - NL - P.
Alteration of the measurement unit will have consequences for operator
and SETUP-level values.
Please note that the K-factor has to be adapted as well; the calculation is
not done automatically.
TIME UNIT
22
The flowrate can be calculated per second (SEC), minute (MIN), hour
(HR) or day (DAY).
DECIMALS
23
This setting determines for flowrate the number of digits following the
decimal point. The following can be selected:
00000 - 1111.1 - 2222.22 - 3333.333
K-FACTOR
24
With the K-factor, the flowmeter pulse signals are converted to a flowrate.
The K-factor is based on the number of pulses generated by the
flowmeter per selected measurement unit (SETUP 21), for example per
liter. The more accurate the K-factor, the more accurate the functioning of
the system will be. For examples read SETUP 13.
DECIMALS K-FACTOR
25
This setting determines the number of decimals for the K-factor
(SETUP 24). The following can be selected:
0 - 1 - 2 - 3 - 4 - 5 - 6
Please note that this SETUP - influences the accuracy of the K-factor
indirectly.
This setting has NO influence on the displayed number of digits for
"flowrate" (SETUP 23)!
FILTER
26
This function is used to stabilize the flowrate reading. With the help of this
digital filter a more stable but less actual reading can be obtained.
The filter principal is based on three input values: the filter level (01-99),
the last calculated flowrate and the last average value. The higher the
filter level, the longer the response time on a value change will be.
Below, several filter levels with there response times are indicated:
F
ILTER VALUE
R
ESPONSE TIME ON STEP CHANGE OF ANALOG VALUE
.
T
IME IN SECONDS
50%
INFLUENCE
75%
INFLUENCE
90%
INFLUENCE
99%
INFLUENCE
10
0.7 second
1.4 seconds
2.2 seconds
4.4 seconds
20
1.4 seconds
2.8 seconds
4.5 seconds
9.0 seconds
30
2.1 seconds
4 seconds
7 seconds
14 seconds
50
3.5 seconds
7 seconds
11 seconds
23 seconds
75
5.2 seconds
10 seconds
17 seconds
34 seconds
99
6.9 seconds
14 seconds
23 seconds
45 seconds
PERIOD
27
The flowrate is calculated by counting the number of pulses within a
certain time, for example 1 second. The longer the time the more accurate
the flowrate will be. The maximum value is 999.9 seconds.
Note:
this setting does influence the update time for the analog output
directly (maximum update 10 times a second). If the output response is
too slow, decrease the number of pulses.
Note:
the shorter the time, the higher the power consumption of the unit
will be (important for battery powered applications).
Содержание F126-P-EG-IA-TP
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