Toshiba LF620F Instruction Manual page 69

● Span
You can set the span for actual flow rate or flow velocity.
(1) Setting range
The span can be set within 0.1 m/s to 10 m/s in terms of flow velocity.
If you try to set the span outside of this range, either high limit or low limit error message
appears:
HIGH OVER SPEC (if the set value exceeds 10 m/s)
LOW OVER SPEC (if the set value is less than 0.1 m/s)
Try again to set the span within the range.
(2) Limitation of multiple ranges
When multiple ranges are used, the following must be observed:
In the case of unidirectional flow,
Range 1 > Range 2 > Range 3 > Range 4
In the case of bidirectional flows,
Range 1 > Range 2,
Range 3 > Range 4
If you try to set the ranges not conforming to the above, the following message
appears:
MULTI RANGE ERROR
Try again to set the ranges as specified above.
(3) Influence on count rate (pulse rate)
If you have changed the range when count rate (pulse rate) is set, the pulse output for 100%
output may exceed the maximum allowable range.
If this happens, the following message appears after all ranges are set and the screen goes to
the count rate (pulse rate) setting sequence.
HIGH OVER CNT RATE or LOW OVER CNT RATE
In this case, set the count rate (pulse rate) again in accordance with 8.2.20 "Count Rate,
Pulse Width Setting Mode and Pulse Width."
● Unit of span
The span setting is performed for Range 1.
The same unit as that of Range 1 applies automatically to Ranges 2 to 4 and thus its setting is
not needed.
You can select the setting unit from the units below:
Flow velocity unit
Flow rate unit
(Note)
Other
If you have changed the unit, the new span value will be displayed automatically based on the
newly set unit. When custom unit is selected, the new span value will be displayed
automatically based on the custom coefficient and custom unit of 8.2.7 "Custom Coefficient
Setting" and 8.2.8 "Custom Unit Setting". The details see 10.10 "Custom unit function".
Note : Mgl = 1,000,000 gal
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m/s, ft/s
3 3 3 3
m /s, m /min, m /h, m
mL/s, mL/min, mL/h, mL/d, gal/s, gal/min, gal/h, gal/d
bbl/s, bbl/min, bbl/h, bbl/d, pt/s, pt/min, pt/h, pt/d
qt/s, qt/min, qt/h, qt/d
3 3 3 3
ft /s, ft /min, ft /h, ft /d, Mgl/s, Mgl/min, Mgl/h, Mgl/d
Custom unit
－ 68 －
6 F 8 A 0 9 2 8
/d, L/s, L/min, L/h, L/d