Xylem FM500 ULTRASONIC FLOW METERS - Manual (Page 26)

Page 26
The flowmeter indicates that it is in the Faulted State as follows:
The Faulted state will attempt to self correct, however, if the error is due to a
configuration problem such as impossible pipe geometries, the configuration error must
be corrected before the fault condition will clear. Repositioning the transducers may be
required before the fault can correct itself. A fault that is caused by an empty pipe
condition, excessive air or particles in the fluid, or other such flow stream disturbances
will self correct when the flow stream returns to an acceptable condition.
The Fault and Warning codes and their respective numbers are listed below. See the
troubleshooting guide in the index of this manual for more information about correcting
for errors.
Fault Codes
F15 Transit Time: Burst onset not detected
F13 Transit Time: Measured sound speed exceeded the configured allowable limit
F19 Improbable flow rate over 40 feet per second (12 meters per second)
F81 Receive signal too weak or absent during burst accusation
F91 Impossible pipe geometries
Warning Codes
W11 Receive signal near lower limit of operation
W12 Receive signal too strong
W13 Transit Time: Measured sound speed exceeded the configured allowable limit
W16 Transit Time: Burst onset not detected
W17 Transit Time: Periodic burst onset detection has large decrease in confidence
W18 Transit Time: Large gain in periodic receiver gain adjustment detected
W37 Improbable scaling offset (e.g. less than 0.5 or greater than 2.0)
The user can configure a fluid sound speed limit value. This feature can be used to
monitor the fluid and alert the user to changes in fluid density. Should the measured
sound speed be greater then the acceptable percentage of error, error code 13 will be
recorded. Error code 13 can be configured to result in either a fault condition or a
warning condition. The default setting is recorded as a fault. See section 5.4.3 for more
information on this feature.
Model 1: The Fault LED (red) flashes to
identify the error (note that this LED is on
the motherboard and the wiring access door
must be opened to see it) . All yellow LEDs
are off.
Model 2: as for Model 1, plus the error code
appears in the upper right hand corner of
the Run Mode display screen.
Model 3: as for Model 2.
INDICATOR LIGHTS IN
SELF-TEST STATE
MODEL 2 and MODEL 3
15
Attempting Correction.....
1 T 2.46 in. [ £ ] F15
FAULT
£ £ £
4.8
Fault and
Warning Error
Codes (cont.)
Ultrasonic Flowmeter