4) preventing sin empty pipe condition, Toshiba – Toshiba LF494 User Manual
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(3) Flow Direction
Install the delector in accordance with the flow direction arrow on the detector. See I’ignre 4,5.
If the actual flow runs opposite to the specified flow direction, the following display and
output appears.. (For bidirectional multi-range measurement, sec 103^ “Mulli-rangc
Functions/’).
* LCD display (optional)« Instantaneous How rate—indicates negative values»
Totalized flow—no a>unts added,
* Output:Current output—4.0 mA output; Pulse output—No pulses
For bidirectional range measuremenu the flow in opposite direction results in a positive
output value. See 10.3» “Multi-range Functions/’
(4) Preventing sin Empty Pipe Condition
Design an upright pipe run (Figure 4.6) or sufficicjit head pressure (Fig, 4.7) at the
downstream detector oullet if there is a possibility of the detector pipe becoming emptied.
Upright pipe run
Figure 4«6 Detector with 3n upright pipe run at dow'ustream outlet
Detector
Z
Figure 4.7 Detector with sufficient head pressure at downstream outlet
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