GE PT878GC User Manual download pdf (Page 219)

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.

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GE PT878GC User Manual Page 219