Toshiba LF600F - Manual (Page 117)

TOSHIBA 6,F,8A0,8,6,9.
10.2 Totalizer and Pulse Output
To use the totalizer and pulse output for external use, proceed as follows.
Counting Rate and Pulse Width Settings
Set the counting rate (flow volume per count) and the pulse width. Refer to 0,
“Counting Rate”.
* The counting rate should be set so that its rate for 100% flow rate output is
within the range from 3.6 to 3600000 pulses/h (1/1000 to 1000 pulses^)
(Note 2)
* The pulse width can be set from 0.3ms to 500ms. The pulse width should be
set to less than half of the pulse rate for 100% flow rate output. (Note 3)
If the pulse width setting mode is AUTO, the pulse width is automatically set. If the
pulse width setting mode is MANUAL, set it after checking the receivable signal
width of the receiving measuring meter.
If the pulse output is not used, pulse width setting is not needed.
DO function setting
According to Section 8.2.20 "Digital I/O", set the digital output 1 (DOl) to pulse
output (PULSE OUT).
If the digital output function has been disabled at count rate setting (no use), it is
automatically set to pulse output.
This is not needed if the pulse output is not used.
Measurement Mode
■ Set the operation mode of the system to the measurement mode. Refer to 7.3.1,
“Mode Change.”
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Clear (reset) the totalizer, (notel)
Clear the count value by the [CLR] key on the totalization control screen.
If you have changed the counting rate, clear (reset) the totalizer before you start the
totalizer.
Start the totalizer, (notel)
■ Start counting by the [STA] key on the totalization control screen and make sure
“CNT” is shown on the display.
Notes 1 xhe LF600F converter has a function to stat/stop the counter operation or clear the
internal counter.
For details of the operation method, see “Totalizer Operation.”
2. Example for counting rate:
The counting rate should be set so that its rate for 100% flow rate output is
within the range from the minimum value (36000000 pulses/h) to the
maximum value (3.6 pulses/h).
Example
In the case of range 3600m^/h (1 mVs),
Minimum value: Since the counting rate is 36000000 pulses/h,
3600 (m3/h) / 36000000 (pulses/h) = O.OOlm^ = 0.1 L
Maximum value: Since the counting rate is 3.6 pulses/h,
3600 (m^/h) /3.6 (pulses/h) = lOOOm^
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