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Chapter 3. Programming Site Data
40 Transport® Model PT878 Portable Liquid Flowmeter User’s Manual
3.6.1 Path Parameters for Clamp-On Transducers
Note: For wetted transducers, go to page 41.
If you are using clamp-on transducers, the PT878 path menu includes two
parameters:
• Traverses
• Spacing
1. The PT878 first prompts for traverses, the number of times the
ultrasonic signal crosses the pipe (see the Liquid Transducer
Installation Guide (916-055) for more details).
a. Press [ENTER] to open the drop-down list of traverse numbers.
b. Scroll to the appropriate number.
c. Press [ENTER] to confirm the entry.
2. The next prompt displays the spacing of the transducers, as calculated
from the information entered.
a. Record this number and use it to space the transducers. (Use the
Liquid Transducer Installation Guide (916-055) to assist in
installing transducers on the pipe.) Press the [T] key to scroll to the
next parameter.
b. If necessary, you can overwrite the spacing to match the actual
physical spacing of the transducers. (Do not change the spacing by
more than ±10% from that calculated by the meter.) Use the numeric
keys to enter the desired value, and press
[ENTER] to confirm the
entry. If you have entered an invalid entry, the PT878 rejects the
entry and displays an error message.
Note: It is not recommended that you use a spacing other than the one
calculated by the PT878.
After you enter the spacing, pressing the [
S] key returns the prompt to the
Traverses box, and then to the Path tab at the top of the screen.