Path Parameters For Clamp-On Transducers - GE CTF878 Programming Manual

February 2009
Path Parameters for
Clamp-On Transducers
UPSTREAM
RECEIVER
PIPELINE
(no taps)
FLOW
CLAMPING
FIXTURE
Figure 1-14: Typical Clamping Fixture/Transducer Setup
1-16
The CTF878 path menu includes two parameters:
•
TAG Path
•
Transducer Spacing
The TAG Path is calculated from the data entered in the Pipe
parameters under Program. It can be overwritten if the user wants to
use a value other than the one calculated by the flowmeter. However,
it must always match the TAG Path set on the clamping fixture for
reliable operation. If the path is changed on the instrument and on the
clamping fixture, it must be within ±10% of the original TAG Path
calculated by the flowmeter.
The Transducer Spacing is calculated from the data entered in the
Transducer/Pipe/Fluid parameters. The value of Transducer Spacing
is NOT used in the flowmeter's data processing, unlike the Tag Path.
Do not attempt to change the Transducer Spacing in the instrument.
It is only an output intended to tell the user the distance to be set
between a Transmitter and a Receiver for optimal signal transmission.
TAG PATH
UPSTREAM
TRANSMITTER
TRANSDUCER
SPACING
DOWNSTREAM
RECEIVER
DOWNSTREAM
TRANSMITTER
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