User manual for flow meter with pulse input SPI-94
“FrEq”
- maximum permitted frequency of pulses delivered to the input. This parameter
is expressed in Hz. And can be set to one of all values showed in Tab.7.1
Minimum
permitted
duration time of Low and High states are related to every
value of
“FrEq”
parameter. If particular state is shorter than showed in Tab.7.1,
it is interpreted as disturbance and ignored.
Parameter
”FrEq” (Hz)
Minimum duration
of low and high states
Permitted duty cycle
for max. frequency
„10”
5 ms
5%-95%
„15”
3,4 ms
5%-95%
„20”
2,5 ms
5%-95%
„30”
1,7 ms
5%-95%
„40”
1,3 ms
5%-95%
„50”
1 ms
5%-95%
„100”
500
µ
s
5%-95%
„300”
167
µ
s
5%-95%
„1 000”
50
µ
s
5%-95%
„3 000”
33
µ
s
10%-90%
„10 000”
33
µ
s
33%-66%
Tab.7.1.Allowable settings of
„FrEq”
parameter, and
related with them minimum durations of logical states
“ZEro t”
- maximum delay time of successive revolution. This parameter is defined with 0.1
second precision, in range 0 ÷ 39.9. If time between two following pulses is
exceeds this parameter, than device displays zero (no flow).
If parameter
“ZEro t”
is set to value lower than parameter
“mEAS t”
, the
“mEAS t”
value is used as maximum time between two following pulses.
“mEAS t”
- minimum
measurement window
width. The „
measurement window
” means the
time period after which counted pulses are recalculated and displayed, and it is
similar to refresh rate. This parameter can be set with 0.1 sec. resolution in range
0 ÷ 19.9 sec.
If time delays between successive pulses are longer than
“mEAS t”
time, then
measurement window width is automatically fitted to input frequency.
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