Panametrics DigitalFlow GC868, Руководство по программированию, Страница: 26 / 134

Chapter 1. Programming Site Data
1-15 DigitalFlow™ GC868 Programming Manual (2-Channel)
7. Press [ENT] to accept the current Velocity High Limit value or enter a new value
and press [ENT] .
The default value for this parameter is 75.0 ft/sec (23 m/sec) and values from –500
to 500 ft/sec (–150 to 150 m/sec) are acceptable. The E3: VELOCITY RANGE error
message appears when the calculated fluid velocity exceeds the programmed
VELOCITY HIGH LIMIT value. See the
Service Manual
for a discussion of error codes.
Note:
The actual maximum velocity depends on your application. Refer to
Table 1-1, Table 1-2 and Table 1-3 of the
Startup Guide
for a list of maximum
velocities.
8. Press [ENT] to accept the current Acceleration value or enter a new value and
press [ENT] .
The default value for this parameter is 5.0 ft/sec
2
(4.6 m/sec
2
) and values from 0 to
100 ft/sec
2
(0 to 30 m/sec
2
) are acceptable. The E6: CYCLE SKIP error message
appears when the calculated fluid velocity changes by more than the programmed
ACCELERATION LIMIT value from one reading to the next. See the Service Manual for a
discussion of error codes.
9. Press [ENT] to accept the current Amp. Discrim Low value or enter a new value
and press [ENT] .
IMPORTANT: Consult the factory before performing this step.
The amplitude discriminator measures the size of the transducer signal received by
the Model GC868. The default value for this parameter is 14 and values from 0 to 100
are acceptable. The E5: AMPLITUDE error message appears when the amplitude
discriminator falls below the programmed AMP. DISCRIM LOW value. See the
Service
Manual for a discussion of error codes.
10. Press [ENT] to accept the current Amp. Discrim High value or enter a new value
and press [ENT] .
IMPORTANT: Consult the factory before performing this step.
The amplitude discriminator measures the size of the transducer signal received by
the Model GC868. The default value for this parameter is 34 and values from 0 to 100
are acceptable. The E5: AMPLITUDE error message appears when the amplitude
discriminator exceeds the programmed AMP. DISCRIM HIGH value. See the
Service
Manual
for a discussion of error codes.
11. Press [ENT] to accept the current Delta T Offset value or enter a new value and
press [ENT] .
IMPORTANT: Consult the factory before performing this step.
An offset between the upstream and downstream transit times is specified at this
prompt. The default value for this parameter is 0  sec and values from –1,000 to 1,000
 sec are acceptable.
12. Press [ENT] to accept the current Skan T Offset value or enter a new value and
press [ENT] .
At this prompt, specify a time measurement offset that compensates for any shift
resulting from cross-correlation. The default value for this parameter is 12.6  sec and
values from –500 to 500

sec are acceptable.
Note:
If you enter a value of 0 for this command, you enable a special mode of
operation, ACTIVE SKAN T-OFFSET, that dynamically calculates the offset.
13. Press [ENT] to accept the current % of Peak value or enter a new value and press
[ENT] .
The percentage of peak used to calculate the transit times and Delta T is specified at
this prompt. The default value for this parameter is 80% and values from 1 to 100% are
acceptable.