Dynasonics TFXP Series Transit Time Ultrasonic Flow Meter - Manual (Page 70)

Rev. 5/09
-3.32- TFXP
Flow Rate
Relay
Batch/Totalize
Mode Totalize mode configures the relay(s) to output a 50 mSec pulse
(contact changeover) each time the display totalizer increments –
divided by the Total Mult. The Total Mult value must be a whole,
positive, numeric value.
Example 1: If the Totalizer Exponent is set to E0 (×1) and the
Totalizer Multiplier is set to 1, then the relay will pulse each time the
totalizer increments one count, or each single, whole measurement
unit totalized.
Example 2: If the Totalizer Exponent is set to E2 (×100) and the
Totalizer Multiplier is set to 1, then the relay will pulse each time the
display totalizer increments or once per 100 measurement units
totalized.
Example 3: If the Totalizer Exponent is set to E0 (×1) and the
Totalizer Multiplier is set to 2, the relay will pulse once for every two
counts that the totalizer increments.
Flow rate relay configuration permits relay changeover at two
separate flow rates allowing operation with an adjustable switch
deadband. Figure 3.13 illustrates how the setting of the two set
points influences rate alarm operation.
A single-point flow rate alarm would place the ON> setting slightly
higher than the OFF< setting – allowing a switch deadband to be
established. If a deadband is not established, switch chatter (rapid
switching) may result if the flow rate is very close to the switch point.
Figure 3.13 — Single Point Alarm Operation
PART 3 - KEYPAD CONFIGURATION