DigitalFlow™ GF868 Programming Manual (1-Channel) 23
Chapter 1. Programming Site Data
1.10.1 Setting Transducer Signal Limits
Use this option to set the limits for the incoming signal and other parameters affecting the transducer signal. For
example, the programmed signal strength low limit may be used to determine the trigger point for an alarm.
Complete the following steps to enter the signal parameters:
1. To enter the SIGNL submenu, press [F1] at the SETUP window.
2. Press
[ENT] to accept the current Signal Low Limit value or enter a new value and press [ENT].
The default value for this parameter is 20 and values from –20 to 100 are acceptable. The E1: LOW SIGNAL error message
appears when the signal strength falls below the programmed SIGNAL LOW LIMIT value. See the Service Manual for a
discussion of error codes.
3. Press [ENT] to accept the current Cor. Peak Limit value or enter a new value and press [ENT].
The default value for this parameter is 100 and values from 0 to 500 are acceptable. The E4: SIGNAL QUALITY error
message appears when the signal quality falls below the programmed COR. PEAK LIMIT value. See the Service Manual
for a discussion of error codes.
4. Press [ENT] to accept the current Velocity Low 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 is less than the
programmed VELOCITY LOW LIMIT value. See the Service Manual for a discussion of error codes.
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. See the Service Manual for a discussion of error codes.
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/sec2 (30.48 m/sec2) and values from 0 to 250 ft/sec2 (0 to 76 m/sec2) 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.
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.
CAUTION! The SIGNL default settings are suitable for most applications. Before changing any
of these parameters, consult the factory.
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