Chapter 1. Programming Site Data
34 DigitalFlow™ DF868 Multipurpose Ultrasonic Liquid Flowmeter Programming Manual (2-Channel)
1.7.5 Setting Up Global Inputs/Outputs
While following the programming instructions for this submenu, refer to the menu map in Figure 13 on page 100.
1. To enter the GLOBAL menu, press [F3]=GLOBL.
2. To enter the I/O submenu, press [F3]= I/O.
• Press [F1] to set up error handling, or
• Press [F2] to set up any inputs or outputs.
Proceed to the appropriate section for step-by-step instructions on each of the two options offered above.
Note: Be sure to record all programmed data in Appendix B, Data Records.
Selecting Error Handling
This menu option permits programming of the manner in which the Model DF868’s measurements respond during
an error condition. See Chapter 2, Error Codes and Screen Messages, of the Service Manual for a discussion of the
built-in error codes.
1. At the I/O screen, press [F1] to select the Error option.
2. Press [F1] if you want the DF868 to Hold the last “good” reading and continues to totalize, based on that reading,
or press [F2],
No Up, if you want the meter to stop totalizing.
3. Press [F1] to disable 2-path Error Handling, or press [F2] to enable 2-path error handling.
The 2-path 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 Model DF868 performs error handling only if both
channels are in error. If this function is disabled, error handling
occurs when either
channel goes into error.
Specific responses of the totalizer to the 2-path error handling option are listed in Table 19.
3. SThe program asks for the Error-Handling Delay time, the number of seconds before the meter reports than an
error has occurred. Use the numeric keys to enter the number of seconds, and press [ENT]. The User Program
automatically returns to the Global I/O prompt.
Table 19: 2-Path Error Response Options
Option Totalizer Response
NO Outputs the average of CH1 and CH2 totals,
regardless of the error state of either channel.
YES
1. If one channel is in error, totalizing continues.
2. If both channels are in error and “No Up” is selected,
totalizing stops.
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