Baker Hughes DigitalFlow XGF868i, Руководство по программированию

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Table 21: Error options and responses for a one-channel meter
Option Output response Totalizer response
Hold last value Holds the last “good” reading Holds the last “good” reading and continues to
totalize, based on that reading
Force low Forces the outputs to the low set point Stops totalizing
Force high Forces the outputs to the high set point Stops totalizing
Force high high Forces the outputs ≈ 10% above the high set point Stops totalizing
Error level in mA Allows user to enter 4-20 mA error level in mA. Sends analog outputs to entered mA level when a
fault occurs.
Table 22: Error options and responses for a two-channel meter
When measuring Display response
Totalizer response when error handling is
HOLD LOW, HIGH, HHIGH
CH1 or CH2
(vel, vol, etc.)
Holds last “good” reading. Holds last “good” reading and continues
to totalize based on that “good” reading.
Stops totalizing.
SUM Adds two channels using
the last “good” reading.
Holds last “good” reading and continues
to totalize based on two channels.
Stops totalizing if either or
both channels go into error.
DIF Subtracts two channels
using last “good” reading.
Holds last “good” reading and continues
to totalize based on two channels.
Stops totalizing if either or
both channels go into error.
AVE See error handling for average measurements below.
C.6.2b The error option
NOTE: The 2PATH ERROR HANDLING option is intended for
applications where two sets of transducers are installed in
the same location in the same pipe to improve accuracy
and the meter is operated in AVE mode. With this function
enabled, the XGF868i performs error handling only if both
channels are in error. If this function is disabled, error
handling occurs when either channel goes into error.
For a one-channel meter, after responding to the previous
prompt, the meter returns to the global I/O prompt shown
on the previous page. For a two-channel meter, proceed to
step 3 below.
3. Double-click yes to enable
two-path error handling ,
or on no to disable this function.
Specific responses of the display and the totalizer to the
two-path error handling option available at the above
prompt are listed in Table 23 below.
Table 23: 2-Path error response options
Option Display response Totalizer response
NO Displays the average
of CH1 and CH2,
regardless of the error
state of either channel.
Outputs the average
of CH1 and CH2 totals,
regardless of the error
state of either channel.
YES 1. If one channel is
in error, the other
channel’s value is
displayed as the
average.
2. If both channels
are in error, the last
average reading is
held.
1. If one channel is
in error, totalizing
continues.
2. If both channels are
in error, totalizing
stops.
After responding to the above prompt, the meter returns to
the input/output option menu.
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