PFlow Industries P118i, Руководство пользователя, Страница: 44 / 50

P118i Ultrasonic Flowmeter and Analyzer
Reversion: 3.0.0 Page 44 of 49
6. Error Diagnoses
The ultrasonic flowmeter has advanced self-diagnostics functions and displays any errors in the upper right corner
of the LCD via definite codes in a date/time order. Some errors can be detected during normal operation.
Undetectable errors caused by unskilled operation, incorrect settings and unsuitable measurement conditions can
be displayed accordingly during work. This function helps the user detect the errors and find causes quickly; thus,
problems can be solved in a timely manner according to the solutions listed in the following tables.The error
codes caused by incorrect settings and the detected signal can be displayed in Window M08.
6.1 Table 1. Error Codes and Solutions (during operation)
Codes M08 Display Causes Solutions
*R System Normal. * System normal.
*I
Signal Not Detected. * Signal not detected.
* Spacing is not correct
between the transducers
or not enough coupling
compound applied to
face of transducers.
* Transducers installed
improperly.
* Scale is too thick.
* New pipe liner.
* Attach transducer to the pipe and
tighten it securely. Apply a plenty
of
coupling compound on
transducer and pipe wall.
* Remove any rust, scale, or loose
paint from the pipe surface. Clean it
with a file.
* Check the initial parameter
settings.
* Remove the scale or change the
scaled pipe section. Normally, it
is
possible to change a
measurement location. The
instrument may run properly at a
new site with less scale.
* Wait until liners solidified and
saturated
*G
Adjusting Gain
(Display in Windows M01).
* Adjusting gain for
normal measurement.
6.2 Frequently Asked Questions and Answers
Question: New pipe, high quality material, and all installation requirements met: why still no signal detected ?
Answer: Check pipe parameter settings, installation method and wiring connections. Confirm if the coupling
compound is applied adequately, the pipe is full of liquid, transducer spacing agrees with the screen
readings and the transducers are installed in the right direction.
Question: Old pipe with heavy scale inside, no signal or poor signal detected: how can it be resolved?
Answer: Check if the pipe is full of fluid. Try the Z method for transducer installation (If the pipe is too close to a
wall, or it is necessary to install the transducers on a vertical or inclined pipe with flow upwards
instead of on a horizontal pipe).
Carefully select a good pipe section and fully clean it, apply a wide band of coupling compound on
each transducer face (bottom) and install the transducer properly.
Slowly and slightly move each transducer with respect to each other around the installation point until
the maximum signal is detected. Be careful that the new installation location is free of scale inside the
pipe and that the pipe is concentric (not distorted) so that the sound waves do not bounce outside of the
proposed area.
For pipe with thick scale inside or outside, try to clean the scale off, if it is accessible from the inside.
(Note: Sometimes this method might not work and sound wave transmission is not possible because of