Yokogawa ADMAG AXR - Manual (Page 155)

12-3
IM 01E30D01-01EN
<12. OUTLINE>
Totalizer Display Function (*2):
The flow rate is counted one count at a time accord-
ing to the setting of totalization pulse weights. For
forward and reverse flow measurement functions,
the totalized values of the flow direction (forward or
reverse) and the flow direction are displayed on the
indicator together with the units. The difference of
totalized values between the forward and reverse
flow rate can be displayed. Totalization for the re-
verse flow rate is carried out only when “Forward and
reverse flow measurement functions” is selected.
Damping Time Constant (*2):
The time constant can be set from 1.0 second to
200.0 seconds (63% response). The default is 5
seconds.
When the damping time is short, the output fluctu-
ates. Set the time to 5 seconds or more for control
loop.
Span Setting Function (*2):
Span flows can be set in units such as volume flow
rate, mass flow rate, time, or flow rate value. The
velocity unit can also be set.
Volume Flow Rate Unit: kcf, cf, mcf, Mgal (US), kgal
(US), gal (US), mgal (US), kbbl (US)*,
bbl (US)*, mbbl (US)*, μbbl (US)*, Ml
(megaliter), m 3 , kl (kiloliter), l (liter), cm 3
Mass Flow Rate Unit (Density must be set): klb
(US), lb (US), t (ton), kg, g
Velocity Unit: ft, m (meter)
Time Unit: s (sec), min, h (hour), d (day)
* “US Oil” or “US Beer” can be selected.
Pulse Output (*1)(*2):
Scaled pulse is output one by one according to the
setting of pulse weight.
Pulse Width: Duty 50% or fixed pulse width (0.05,
0.1, 0.5, 1, 20, 33, 50, 100, 200, 330,
500, 1000, 2000 ms) can be selected.
Output Rate: 0.0001 to 10,000 pps (pulses per
second)
Multi-range Functions (*1)(*2):
Automatic range switching
When the flow rate exceeds 100% of the range,
transition to the next range (up to two ranges) is
carried out automatically. Range switching can be
confirmed by the status output and on the indicator.
Forward and Reverse Flow Measurement Func-
tions (*1)(*2):
Flows in both forward and reverse directions can be
measured. The reverse flow measurement can be
confirmed by the status output and on the indicator.
Totalization Switch (*1)(*2):
The status output is carried out when a totalized
value becomes equal to or greater than the set value.
Preset Totalization (*1)(*2):
The parameter setting enables a totalized value to be
preset to a setting value or zero.
Alarm Selection Function (*2):
Alarms are classified into the System Alarms (hard-
ware failure), Process Alarms (such as Signal
Overflow and Adhesion Alarm), Setting Alarms, and
Warnings. Process Alarms and Setting Alarms can be
activated or deactivated for each item. The current
output for an alarm can be selected from the follow-
ing settings. If any System Alarm occurs, turn the
power off and back on again to return to the normal
condition.
System Alarm: 21.6 mA or more, 3.2 mA or less
Process Alarm, Setting Alarm:
21.6 mA or more, 20.5 mA, HOLD
(fixed to the current value before
the alarm), 4 mA, 3.8 mA, 3.2
mA or less.
The default settings of each alarm are as follows:
Standard
Optional
code C1
System Alarm
21.6 mA or more 3.2 mA or less Process Alarm
Setting Alarm
Note: In the case of style: S1 with optional code C1, the
current output is set up to 3.8 mA during Process
Alarms and Setting Alarms.
NE-107 Alarm Message (*2):
Alarms are classified into 4 categories by NAMUR
NE-107 and can be displayed.
-F: Failure
-C: Function check
-S: Out of specification
-M: Maintenance required
Alarm Output (*1)(*2):
Alarms are generated only for the items selected
via the ‘Alarm Selection Function’ if relevant failures
occur.
Self Diagnosis Functions (*2):
When an alarm is output, details of the System
Alarms, Process Alarms, Setting Alarms, and Warn-
ings are displayed together with the specific descrip-
tion of corresponding countermeasures.
Results of mean flow measurement during a given
period, etc. can be checked by using parameters.
Flow Rate Upper/Lower Limit Alarms (*1)(*2):
If a flow rate becomes out of the predetermined
range, the alarm output is generated.
Electrode Adhesion Diagnosis Function (*1) (*2):
This function enables checking of the adhesion level
of insulating substances to the electrodes. Depend-
ing on the status of adhesion, users are notified by a
warning or an alarm via status outputs.
While adhesion diagnosis is being carried out (ap-
proximately 5 minutes), a current of 4 mA is output
because the flow measurement is not performed.
Adhesion diagnosis should only be carried out when
the fluid velocity is completely zero by closing the
valve.
When adhesion diagnosis is carried out, change the
control loop to the manual mode first.
Data Security during Power Failure:
Data (parameters, totalization value, etc.) storage by
EEPROM. No back-up battery required.
Low Cut (*2):
In this function, the values of the current output along
with LCD indication, totalization, and pulse, which are
corresponding to setting span of 0 to 20%, are fixed
at 0% (including reverse flow). The default setting is
3%.
When the Low Cut point is small, the incorrect output
may occur at the flow rate of zero. Set the Low Cut
point to 3% or more. If the span is small, the damping
time is short or the fluid is low conductivity, the incor-
rect output may easily occur at the flow rate of zero.