APC AXFA11G User Manual download pdf (Page 110)

IM 01E20C01-01E

11-2

11. OUTLINE

Functions

How to Set Parameters:

The indicator’s LCD and three infra-red switches enable

users to set parameters without opening the case cover.

Parameters can also be set by means of the HHT(Hand-

held terminal).

Displayed Languages:

Users can choose a language from among English,

Japanese, German, French, Italian, Spanish.

Instantaneous Flow Rate/Totalized Value Display

Functions:

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 value

• Tag No.

• Results of electrode adhesion diagnostics

Totalizer Display Function:

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:

Time constant can be set from 0.1 second to 200.0

seconds (63% response).

Span Setting Function:

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

, kl

(kiloliter), l (liter), cm

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:

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:

• Range switching via status input

Status input enables the switching of up to four 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:

Flows in both forward and reverse directions can be

measured. The reverse flow measurement can be

confirmed by status output and indicator.

Totalization Switch:

The status output is carried out when a totalized value

becomes equal to or greater than the set value.

Preset Totalization:

The parameter setting or status input enables a totalized

value to be preset to a setting value or zero.

0% Signal Lock:

Status input forcibly fixes the instantaneous flow rate

display, current output, pulse output, and flow rate

totalization to 0%.

Alarm Selection Function:

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:

Alarms are generated only for the items selected via the

‘Alarm Selection Function’ if relevant failures occur.

Self Diagnostics Functions:

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:

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:

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.

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APC AXFA11G User Manual Page 110

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