Xylem FM500 ULTRASONIC FLOW METERS - Manual (Page 33)

Page 33
5.4.2
Transducer
Setup The Transducer Setup branch of the
Configuration Edit Menu allows you to
establish the fundamental parameters of the
flow meter, including the ultrasonic
transducers, the pipe to which they are
mounted, the liner inside the pipe, if any,
and the fluid flowing in the pipe.
Using information entered here, the
flowmeter calculates many “engineering”
parameters that are critical to accurate
measurement. This is done when a
ENTER Ç ESC È
Configuration Set #3
Ê
Transducer Setup
Transducer
Pipe
Liner
Measurement Units
Fluid
Configuration Set is “activated”, but not when a user exits Setup Mode by “escaping”
(for example, after the five minute timeout). Note that changes in this area of
configuration followed by an escape from Setup Mode may cause the flowmeter to
display incorrect flow information.
Under the Transducer Setup branch, the following actions are available:
Measurement Units allows you to specify
whether dimensions will be entered in
inches and the speed of sound in feet-per-
second (English) or dimensions will be
entered in millimeters and the speed of
sound in meters-per-second (Metric). This
choice and all entered numbers must be
consistent when a Set is activated. If, for
example, the pipe diameter is entered as
2.00 when English units are selected but the
choice is then changed to Metric, it is
necessary to go back and enter 50.8 as the
pipe diameter or the flowmeter will attempt
to configure itself for a pipe which is only 2
millimeters across (and will fault).
Transducer --> Model Number allows you to
specify the model number of the transducer
pair used. You should not change this
setting unless you use a different transducer
pair from that originally supplied. The
transducer model number (A00 through
A20) is printed on the transducer housing.
Transducer --> Mount Method allows you to
specify the transducer mount method used
when the meter is set for Transit Time measurement mode. The options are “Z” mount
(transducers on opposite sides of the pipe, no reflections of the sound wave on the pipe
wall),
“V” mount (transducers on the same side of the pipe, one
reflection from the far wall),
See section 6.0.
Pipe Outside Diameter allows you to specify the outside diameter of the pipe.
Pipe --> Wall Thickness allows you to specify the thickness of the pipe wall. From this
and the outside diameter, the flowmeter calculates the inside diameter and hence the
cross-sectional area of the pipe. This is critical to converting the measured velocity of the
fluid to a volumetric flow.
“N” mount (transducers on opposite sides of the pipe, two reflections of the sound
wave on the pipe wall),
“W” mount (transducers on the same side of the pipe, two
reflections from the far wall).
ENTER Ç ESC È
New Configuration Set
Ê Measurement Units
Transducer Setup
Metric (SI units)
English (U.S. units) Ê
ENTER Ç ESC È
New Configuration Set
Ê Transducer
Transducer Setup
Mount Method
Model Number Ê
Ultrasonic Flowmeter