Bidirectional Pulse Output - Oval ALTI mass CA00A Instructions Manual

L -- 740 -- 28 -- E

9.12.3 Bidirectional pulse output

By allowing status output signal to provide flow direction information, the transmitter distinguishes
between pulse outputs in the forward and reverse flow, and counts up pulses independently. (Hence, it
requires on the part of measuring instrument a circuit to distinguish the directions of flow.) To utilize this
function, you need to set up the following in addition to settings of pulse outputs 1 and 2.
(1) Setup procedure
① Status output function assignment (Function) (See 9.2.5 Transition chart (4) [No. 2-4-5-1].)
・Select Bi Direction.
② Active output of status output (Mode) (See 9.2.5 Transition chart (4) [No. 2-4-5-3].)
Set the active output status of status output.
・Off Active: Output is in the Short in the forward fluid flow.
・On Active: Output is in the Open in the forward fluid flow.
(2) An example of settings and assignments
Status output function assignment (Function):
Active output of status output (Mode):
Pulse output 1 assignment (Assign):
Frequency of pulse output 1 at full scale flowrate (Freq Factor): 1000 [Hz]
Full scale flowrate of pulse output 1 (Rate Factor):
Low flow cutoff of pulse output 1 (Lowcut):
100
80
60
40
20
0
-20
-40
-60
-80
-100
1000
800
600
400
200
0
Output clamped at 0
due to proportion of
flowrate < low cutoff.
Open
Short
Status output is Open
as flowrate goes
negative below 0.
10
Output clamped at
Output appears
0 due to proportion
dueto proportion
of flowrate < low
of flowrate > low
cutoff.
cutoff.
Status output is Short
as flowrate goes
positive below 0.
Bi Direction
Off Active
Mass Flow
100.0 [kg/min]
10.0 [%]
Time
Low flow cutoff freq.
100[Hz]
=1000｢Hz] 10[%]/100"
Output appears due to
proportion of flowrate >
low cutoff.