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DigitalFlow™ GF868 Programming Manual (2-Channel)
17
Chapter 1. Programming Site Data
1.6.5a Setting Signal Limits (cont.)
5.
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 300.0 ft/sec (85 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.
6.
Press
[ENT]
to accept the current
Acceleration
value or enter a new value and press
[ENT]
.
The default value for this parameter is 100.0 ft/sec
2
(30.48 m/sec
2
) and values from 0 to 250 ft/sec
2
(0 to 76 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.
7.
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 GF868. 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.
8.
Press
[ENT]
to accept the current
Amp. Discrim High
value or enter a new value and press
[ENT]
.
The amplitude discriminator measures the size of the transducer signal received by the Model GF868. 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.
9.
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 –1000 to 1000
sec are acceptable.
10.
Press
[ENT]
to accept the curren
t Skan T Offset
value or enter a new value and press
[ENT]
.
At the above prompt, specify a time measurement offset that compensates for any shift resulting from cross-correlation.
The default value for this parameter is 58
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.
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