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April 2004
9-18 Servicing the PT878GC
Programming the Thickness Gauge (cont.)
1. Press the [T] arrow key to enter the window.
2. The first prompt asks for the low signal threshold. If the signal
strength falls below this value, a “Low Signal” message
appears on the screen. To change this value:
a. Press
[ENTER] to open the text box.
b. Use the numeric keys to enter the provided value.
c. Press
[ENTER] to confirm your entry.
3. The next value, transducer delay, represents the time the
ultrasonic signal takes to travel from the meter to the pipe
material surface. To change this value:
a. Press
[ENTER] to open the text box.
b. Use the numeric keys to enter the desired value.
c. Press
[ENTER] to confirm your entry.
4. The signal inversion prompt enables you to invert the
thickness transducer signal. Signal inversion may be
necessary if your thickness readings show unusual jitter, or for
certain unusual combinations of pipe and fluid or pipe and
lining. Consult the factory before measuring the thickness of
lined pipes.
Note: When measuring the thickness of certain pipe materials,
you might need to drain the pipe before measuring the
pipe wall, because certain pipe/liquid combinations
muffle the ultrasonic echo.
Signal inversion should be on, unless you have received other
instructions. To change its status, use the [
W ] and [X] arrow
keys to move to the appropriate radio button and press
[ENTER].
5. To enter the noise threshold:
a. Press
[ENTER] to open the text box.
b. Use the numeric keys to enter the recommended value.
c. Press
[ENTER] to confirm your entry.