Model CTF878 Programming Manual
13
Chapter 1. Programming Site Data
1.8.1
Path Parameters for Clamp-On Transducers
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.
Figure 14: Typical Clamping Fixture/Transducer Setup
UPSTREAM
UPSTREAM
DOWNSTREAM
DOWNSTREAM
CLAMPING
FIXTURE
PIPELINE
(no taps)
TAG PATH
TRANSDUCER
SPACING
FLOW
RECEIVER
RECEIVER
TRANSMITTER
TRANSMITTER