Toshiba LF434 - Manual (Page 23)

TOSHIBA
6 F 8 A 0 7 7 0
(3) Flow Direction
Inculi the detector in accord<i!tcowilli (he flow directi on arre won the detector. See Figure 4.ò.
] 11 he act u iit l fi ow mn s opposi te to t h e specif i eci flow d i ree lio it, t ho follo win g d ì spi ay
i\
lìd
output appears., (For bidirectional multhrange moasurorrient, see 10,3/‘Mulii-rarige
Functions,’*).
' LCD display (optional)i Instantaneous flow rate—indicates negativo values,
Totalized flow—no counts added.
■ Output:Current output— 4.0 mA output; Pulse output^—^No pulses
I'or bidirectional range measurement, the flow in opposite direction results in a positive
output value. Sec 10.3, ‘"Multi-range Functions.*’
Flow direction arrow
Figure 45 Flow direction arrow on the detector
(4) Preventing an Empty Pipe Condition
Design an upright pipe run (Figure 4.6) or sufficicni head pressure (Fig. 4,7) at the
downstream detector outlet if there is a possibiiity of the detector pipe becoming emptied*
Upright pipe run
Figure 4.6 Detector with an upright pipe run at downstream outlet
Detector
CH
Figure 4.7 Detector with suftldecit head pressure at downstream outlet
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