GE DigitalFlow DF868, Service Manual

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DigitalFlow™ Multipurpose Ultrasonic Liquid Flowmeter Service Manual 21
Chapter 3. Diagnostics
Chapter 3. Diagnostics
3.1 Introduction
This chapter explains how to troubleshoot the Model DF868 if problems arise with the electronics console, the
flowcell, or the transducers. Indications of a possible problem include:
•
display of an error message on the active display screen
•
erratic flow readings
•
readings of doubtful accuracy (i.e., readings that are not consistent with readings from another flow measuring
device connected to the same process).
If any of the above conditions occurs, proceed with the instructions presented in this chapter.
3.2 Displaying Diagnostic Parameters
The Model DF868 has a built-in Diagnostics Menu to aid in the troubleshooting of flowcell, transducer and/or
electrical problems. The Diagnostics Menu may only be entered from the Big or Dual measurement mode display. See
Chapter 2, Displaying Data, in the Programming Manual for instructions on setting the display screen to the desired
format, and enter the Diagnostics Menu as shown below.
Note:
For a 1-Channel Model DF868, the above prompt does not appear, and the following prompt is the initial
screen.
Note:
Ch1 (or Ch2), which is shown in parentheses above, appears in the locator bar only with a 2-Channel Model
DF868.
(Ch1) label SITE

Press the [

]
or [

]
keys until the desired channel option appears on the option
bar. Press the appropriate
[Fx]
key to select this option.
Velocity Ft/s
6.95
(error codes appear here)
CH1 CH2 SUM DIF
(Ch1) label SITE

Press the [

]
or [

]
keys until
DIAG
appears on the option bar. Press the
appropriate
[Fx]
key to select this option.
Velocity Ft/s
6.95
(error codes appear here)
TIME DIAG