Yokogawa AXFA14G/C - Manual (Page 104)

IM 01E20C02-01E 11-2
11. OUTLINE
Functions “
᭛”
How to Set Parameters (*2):
The indicator’s LCD and three infra-red switches enable
users to set parameters without opening the case cover.
Parameters can also be set with the configuration tool
(Such as HHT (handheld terminal) or FieldMate, etc.).
The language for the HHT is English only.
Displayed Languages (*2):
Users can choose a language from among English,
Japanese, German, French, Italian, Spanish.
Instantaneous Flow Rate/Totalized Value Display
Functions (for models with an indicator) (*2):
The full dot-matrix LCD enables user selections of
displays from one line to three lines for:
• Instantaneous flow rate
• Instantaneous flow rate (%)
• Instantaneous flow rate (bar graph)
• Current output value (mA)
• Totalized forward-direction flow rate
• Totalized reverse-direction flow rate
• Totalized differential flow rate
• Tag No.
• Results of electrode adhesion diagnostics
• Communication type
Totalizer Display Function (*2):
The flow rate is counted one pulse at a time according 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. Totaliza-
tion for the reverse flow rate is carried out only when
“Forward and reverse flow measurement functions” is
selected.
Damping Time Constant (*2):
Time constant can be set from 0.1 second to 200.0
seconds (63% response). The default is 3 seconds.
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 can be output by setting a pulse weight.
Pulse Width: Duty 50% or fixed pulse width (0.05, 0.1, 0.5,
1, 20, 33, 50, 100 ms) can be selected.
Output Rate: 0.0001 to 10,000 pps (pulse/second)
Multi-range Function (*1)(*2):
• Range switching via status input
Status input enables the switching of up to two ranges.
• Automatic range switching
When the flow rate exceeds 100 % of the range,
transition to the next range (up to four ranges) is carried
out automatically. Range switching can be confirmed by
status outputs and indicator.
Forward and Reverse Flow Measurement Functions (*1)(*2):
Flows in both forward and reverse directions can be
measured. The reverse flow measurement can be
confirmed by status output and indicator.
Totalization Switch (*1)(*2):
The status output is carried out when output if a totalized
value becomes equal to or greater than the set value.
Preset Totalization (*1)(*2):
The parameter setting or status input enables a totalized
value to be preset to a setting value or zero.
0% Signal Lock (*1)(*2):
Status input forcibly fixes the instantaneous flow rate
display, current output, pulse output, and flow rate
totalization to 0%.
Alarm Selection Function (*2):
Alarms are classified into System Alarms (hard failures),
Process Alarms (such as ‘Empty Pipe’, ‘Signal Overflow’
and ‘Adhesion Alarm’), Setting Alarms, and Warnings.
Whether alarms should be generated or not can be
selected for each item.
The current output generated for an alarm can be
selected from among 2.4 mA or less, fixed to 4 mA, 21.6
mA or more, or HOLD.
Alarm Output (*1)(*2):
Alarms are generated only for the items selected via the
‘Alarm Selection Function’ if relevant failures occur.
Self Diagnostics Functions (*2):
If alarms are generated, details of the System Alarms,
Process Alarms, Setting Alarms and Warnings are
displayed together with concrete descriptions of counter-
measures.
Flow Upper/Lower Limit Alarms (*1)(*2):
If a flow rate becomes greater or smaller than the set
value, this alarm is generated. In addition, two upper limits
(H, HH) and two lower limits (L, LL) can be set.
If a flow rate becomes greater or smaller than any of the
set values, the status is output.
Electrode Adhesion Diagnostics Function (*1) (*2):
This function enables monitoring of the adhesion level of
insulating substances to the electrodes. Depending on the
status of adhesion, users are notified by a warning or an
alarm via status outputs. If replaceable electrodes are
used, they can be removed and cleaned when adhesion
occurs.
■ HAZARDOUS AREA CLASSIFICATION
Refer to Chapter 12.
■ STANDARD PERFORMANCE
Accuracy (Combined with AXF Remote Flowtube)
Note: The accuracy of a product before shipment is
defined as totalized value at the result of calibration
test in our water actual flow test facility.
Calibrated conditions in our water actual test facility
are as follows:
Fluid temperature; 20 ± 10°C
Ambient temperature; 20 ± 5°C
Length of straight runs;10 D or more on the
upstream side; 5 D or more
on the downstream side
Reference conditions; Similar to BS EN29104
(1993); ISO 9104 (1991)