DigitalFlow™ DF868 Multipurpose Ultrasonic Liquid Flowmeter Programming Manual (2-Channel) 27
Chapter 1. Programming Site Data
• 4-bit - Consists of only a few pulses with no built-in code pattern. This option aids in cases where a small pipe
diameter does not give each transducer the time necessary to send a series of signals before receiving a series
of signals. It is also a good selection for pipes made of materials which tend to blur the signal pattern, such as
PTFE.
• 11-bit - The 11-bit option consists of a series of approximately one dozen pulses with a distinctive binary pattern
that the meter can easily recognize during auto correlation.
Complete the following steps to select the code length:
1. At the ADVAN window, press [F4] (CODEL) to select Code Length.
2. Use the [
and [F1]-[F4] keys to select the desired option.
The meter returns to the Advanced Features prompt.
Active Tw Measurement
Use this option to actively compensate the transit-time measurement in the fluid for widely varying transducer signal
delays that result from large temperature deviations.
IMPORTANT: Consult the factory before activating this option.
1. At the ADVAN window, press [
and [F1] (ActTw) to select Active TW Measurement.
2. Press [F1] = NO to disable this option, or [F2] = YES to enable Active TW Measurement. If you select NO, the DF868
returns to the Advanced Features prompt.
3. If you enable active Tw measurement, the meter requires the Minimum Tw in µsec. (The range is from 0 to 500
µsec.) Use the numeric keys to enter the value, and press [ENT].
4. The meter also requires the Maximum Tw in µsec. (The range is from 0 to 500 µsec.) Use the numeric keys to
enter the value, and press [ENT].
Procedure Options
After completing the above steps, the meter returns to the Advanced Features prompt. Press [EXIT] to return to the
Channel PROGRAM prompt.
• To continue programming the meter, refer to the menu maps in Appendix A and navigate to the desired menu.
Then, proceed to the appropriate section of this manual for instructions.
• To leave the User Program and retain the previous settings, press [EXIT] twice and then press [F1] = NO at the
SAVE prompt. Any programming changes will be discarded and you will be returned to the data display.
• To leave the User Program and return to measurement mode, press [EXIT] twice and then press [F2] = YES at the
SAVE prompt. Programming changes will be entered into the meter memory, and you will be returned to the
data display.
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