Toshiba – Toshiba LF434 User Manual
Page 23
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TOSHIBA
6 F 8 A 0 7 7 0
(3) Flow Direction
Inculi the detector in accord ] 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 ~ 2 2 -