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Note 1: Example of count rate setting range:
The count rate can be set within the range from the minimum value (36000000 pulse/h) to the
maximum value (3.6 pulse/h).
(Example)
In the case of range 108m
3
/h (0.03m
3
/s),
Minimum value (for 10800000 pulse/h):
108 (m
3
/h) / 10800000 (pulses/h) = 0.00001m
3
= 0.01 L (liter)
Maximum value (for 3.6 pulse/h):
108 (m
3
/h) / 3.6 (pulses/h) = 30m
3
Note 2: Example of pulse width setting range
The pulse width can be set within the range 0.3ms to 500ms in increments of 1ms. However,
the pulse width must be set to 40% or less of the period of pulse frequency at full scale
because of the setting range and count rate requirements.
If “0” is set, the pulse width automatically will be set to 40% of the period of pulse frequency
at full scale. (100ms max.)
(Example 1) Range: 108m
3
/h (0.03m
3
/s)
Count rate: 0.00003m
3
Since the pulse rate is
108(m3/h) / 0.00003(m3) =36000000 pulses/h =1000pulses/p,
the period of pulse frequency at full scale is 1ms.
Therefore, the pulse width can be set only to
1ms × 40% = 0.4ms
(Example 2) Range: 108m
3
/h (0.03m
3
/s)
Count rate: 30m
3
Since the pulse rate is
108(m
3
/h) / 30(m
3
) = 3.6 pulse/h (0.001 pps),
the period of pulse frequency at full scale is 1000000ms
Therefore, the pulse width = 1000000ms × 40% = 400000ms.
However, the maximum pulse width is 500ms,
the pulse width becomes 500ms.
(Example 3) Range: 108m
3
/h (0.03m
3
/s)
Count rate: 0.03m
3
When pulse width is set to 0ms:
Since the pulse rate is
108 (m
3
/h) / 0.03(m
3
) = 3600 pulse/h (1pps)
the period of pulse frequency at full scale is 1000ms.
Therefore, the pulse width = 1000ms × 40% = 400ms.
However, the pulse width that automatically set is 100ms max.
the pulse width becomes 100ms.
Not 3: Model LF546 has a function to start / stop or clear the totalizer. For details of operation, see
“Totalizer Operation” below.