Toshiba LF494 - Manual (Page 73)

TOSHIBA
6 F 8 A 0 7 7 4
2,
The pulse widlh can be from 0-5mii to MIOtm, The pulse width should be set
to less than half of the pvJse rate for
100
% flow rate output. Hven if the value
over 500ms is inputted, the pulse width is set to 500ms.
When the pulse width is set to 0 (zero), it will be automatically set to half of the
pulse rate for 100% flow rate output. If this calculated value is over lOOms, the
pulse width is set to lOOins.
I'.xa in pic I
Case Range
Counting rate(pulse rate)
:36UUm^7h (ImVs)
:0,U01m^
the pulse ratc for
100
% flow rate
: 360f{mVh)/O.D[)l(m') =3fj00000pulses/h=l000pulsefi/p
the pulse ratc= Ims
* t h e p u l s e w i d t h ( M a x . ) = l n s / 2 = 0 . 5n»s
l£xamplc
2
Case Range
Counting rate(pulsc ratc)
:36ÜümVh (ImVs)
:Ш(Ют^
the pulse rale for
100
% flow ratc
: ЗШ:<пг/Ь) / l()ÍHJ(m") =3.6pulses/h=0.(HJlpulses/p
the pulse rate= lOtHJÜÜOms
the pulse width(Max.) = lÜÜÜÜUÜms / 2 = 500000ms
bul, the pulse width is 500ms Max,
* t h e p u l s e w i d t h ( H a x . ) = 5 0 0 m s
:3fl00m^al (Im^/s)
Examples
Casse Range
Counting rate(pulse rale) :lm^
Setting pulse width :0Tns (autotnaiically set)
the pulse ratc for
100
% flow rate
1
350C
the pulse rate=
10
(Юms
the pulse widih(Max.) = 1000ms
! 2 =
500ms
but, the pulse width that auiomatically set is iDOms Max,
* t h e p u l s e w i d th ( M a x .) - 1 0 0 n s
3, To operate the totalizer, i( is preferable to set the indicating unit (UNITI and/or
UNIT 2) to one of the units appropriate for totalization just to make sure it is
operating correctly.
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