Dwyer UXF2 - Manual (Page 67)

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4.5.6. Setting the total
4.5.6.1. Setting the total pulse (pulse value, pulse width)
Description
z
Set for totalizing a process variable (flow rate) by total meter, etc. according to total pulse output.
z Pulse value: Total amount (volume) per pulse.
A pulse is outputted when the total volume has attained an amount set by the pulse value, and adds to the total pulse
count (in case of total pulse indication).
Settable range: 0.000001 to 99999999.
* Set the total unit before setting the pulse value (see Section 4.6.3.).
z Pulse width: Width of total pulse output.
Select a pulse width according to a corresponding total meter out of menus.
Settable range: 5 ms, 10 ms, 50 ms, 100 ms, 200 ms.
Note: If the output is through DO2 (relay contact), select 50 ms or longer (see Section 4.5.7.).
z Restrictions in the setup
Output of total pulses involves the following restrictions depending on the DO output port (DO1, DO2).
DO output port Pulse output frequency range
(at the time of full scale flow rate) Pulse width
DO1: Transistor open collector 1 pulse per day to 100 pulses per
second
5ms, 10ms, 50ms, 100ms, 200ms
DO2: Relay contact 1 pulse per day to 1 pulse per second 50ms, 100ms, 200ms
The maximum output frequency is restricted by the setup of the pulse width.
Therefore, set the pulse width and pulse value so that both condition 1 and condition 2 indicated below are
satisfied.
Correct results may not occur if the setup does not satisfy both condition 1 and condition 2.
Condition 1:
1 FLOW SPAN-1 Note 1) [m 3 /s] 100 [Hz] (case of DO1)
86400
[Hz]
PULSE VALUE [m 3 ] 1 [Hz] (case of DO2)
Condition 2:
FLOW SPAN-1 Note 1) [m 3 /s] 1000
PULSE VALUE [m 3 ] 2 u PULSE WIDTH [ms]
Note 1: The range of FLOW SPAN-1 or FLOW SPAN-2, whichever is larger, is the object in the case of 2-range setup.
Note 2: Restrictions in the maximum output frequency of each output port will occur when the flow rate exceeds
the set range. If the unit is programmed such that the maximum frequency occurs at 100% of flow rate,
totalizer function pulses may be incapable of following the flow rate's required pulsing action for correct
totalizer indication and process measurement. Solution: ensure the user programmed DO output pulse rate
can accomodate the expected process 100% flow rate scale resulting pulsing action.
BULLETIN F-70