Panametrics DigitalFlow XGF868i, Руководство по обслуживанию

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DigitalFlow™ XGF868i Service Manual 17
Chapter 3. Diagnostics
Chapter 3. Diagnostics
3.1 Introduction
This chapter explains how to troubleshoot the XGF868i if problems arise with the electronics enclosure, the flowcell, or
the transducers. Indications of a possible problem include:
• Display of an error message on the LCD 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 XGF868i has built-in Diagnostic Parameters to aid in the troubleshooting of flowcell, transducer and/or electrical
problems. To access these parameters, use the Keypad Program . Then, complete the following instructions to display
the desired diagnostic parameter:
Note:
To perform this function with PanaView software see Appendix C, Programming with PanaView in the
Programming Manual, and/or the PanaView User’s Manual .
1. Press [Escape], [Enter], [Escape].
2. In the Keypad Program window, scroll to PROG and press [ Enter].
3. In the PROG menu, scroll to GLOBL and press [Enter].
4. Scroll to I/O and press [Enter].
5. Scroll to LCD and press [Enter].
6. The window now asks for the # of LCD Parameters . Scroll to the desired number (from OFF through 1-4 and KEY )
and press [Enter] .
The OFF setting switches the measurement display off, while the KEY setting enables users to change the
measurement display via the arrow keys, without accessing the Keypad Program. If you select KEY:
• To view a parameter other than the one currently displayed, press the [r] or [s] keys to scroll through the
various parameters.
• To scroll through the channel options on an XGF868i, press the [v] or [w] keys until you have reached the
desired option.
7. Scroll to the desired Channel option , as listed in Table 2 below.
8. For each channel, select the desired Measurement Parameter , as shown in Table 3 .
Note:
The measurement units that appear in these prompts are those selected in the GLOBL-SYSTM menu earlier
in this section. Also, when differences in one channel's programming invalidate an output previously chosen
for the other, the measurement defaults to the nearest selectable item in the parameter list.
The previous two prompts repeat until all of the specified # of LCD Parameters have been set up. When all of the
display parameters have been set up, the meter returns to the Global I/O window. To leave the Keypad Program ,
press the [Escape] key three times.
Table 2: Channel Options
Option Description
CH1 Channel 1
CH2 Channel 2
SUM CH1+CH2
DIF CH1-CH2
AVE (CH1+CH2)/2