Fuji Electric Time Delta-C FSV-2, Instruction Manual

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4.12.2. Setting the total (actual)
4.12.2.1. Total flow pulse (total rate, pulse width)
Description
 Set output pulse as following description before totalizing flow rate.
 Total rate: Total amount (volume) per pulse.
A pulse is outputted when the total volume has attained an amount set by the total rate, and adds to the total pulse count (in case of
total pulse indication). Settable range: 0.000001 to 99999999
* Set the flow total unit before setting the total rate. (See Section 4.11.3.)
 Pulse width: Width of total pulse output.
Select a pulse width according to a corresponding total meter out of menus. Settable range: 5ms, 10ms, 50ms, 100ms, 200ms,
500ms, 1000ms.

Restrictions in the setup:
Output of total pulses involves the following restrictions depending on the DO output port (DO1, DO2, DO3 and DO4).
DO output port Frequency range of pulse output
(at full scale flow rate) Pulse width
DO1, DO2, DO3, DO4 : Transistor,
open collector 100 pulse/sec 5ms, 10ms, 50ms, 100ms, 200ms
The maximum output frequency is also restricted by the setup of the pulse width. Therefore, set the pulse width and total rate so that
both of condition 1 and condition 2 indicated below are satisfied. Otherwise, accurate result may not be obtained.
Condition 1:
FULL SCALE
(Note1)
[m
3
/s]
TOTAL RATE [m
3
]

100[Hz]
Condition 2:
FULL SCALE
(Note1)
[m
3
/s]
TOTAL RATE [m
3
]

1000
2 × PULSE WIDTH [ms]
Note 1) The range of FULL SCALE1 or FULL SCALE2, whichever is larger, is the object in the case of automatic 2-range setup,
forward and reverse range setup or forward and reverse automatic 2-range setup.
Note 2) The output frequency on the output ports is limited when the flow rate exceeds the set range. Therefore, if such a setup that
the maximum frequency per range occurs at the time of 100% flow rate, there is possibility that the total pulse output will be
incapable of following when the flow rate exceeds 100%, and accurate total value cannot be obtained if over-range continues
for a long time. If there are cases where the flow rate exceeds 100%, modify the set range and total rate so that the maximum
frequency will not exceed the restricted level.
Example of calculation
Calculate the range that permits setup of the total rate under the range and pulse width indicated below.
When the range and the pulse width are as follows:
FLOW SPAN -1: 36[m
3
/h] (=0.01[m
3
/s]), Pulse width:50[ms]
Condition 1
TOTAL RATE

FULL SCALE [m
3
/s]
100[Hz]
=
0.01 [m
3
/s]
100 [Hz]
= 0.0001 [m
3
] = 0.1 [L]
As above:
0.1 [L]  TOTAL RATE ·································································································································· A
Condition 2
TOTAL RATE

FULL SCALE [m
3
/s] ×
2
×
PULSE WIDTH [ms]
1000
= 0.01 [m
3
/s] ×
2
×
50 [ms]
1000
= 0.001 [m
3
] = 1 [L] ···························· B
The settable range of the total rate that satisfies both of condition 1 and condition 2 is as follows from results of calculation A and B.
1 [L]  TOTAL RATE
Note) When the total rate is set to “0”, total pulse is not output.
Note) Set the total mode to STOP before start setting.
 Channel designation : CH1, CH2, CH3
* When using 2-pipe measurement, set CH1, CH2 and CH3.
* No channel setting is necessary for 1-path/energy measurement and 2-path measurement.
For actual keying, refer to the typical operation indicated below. Set the protection to OFF beforehand. (See Section 4.5.1.)