132
Troubleshooting
Troubleshooting the Ultrasonic Sensor
Problems
Causes
Solutions
RS485 Time Out—Did not get a
reading with the specified time
allotted
CPU is having trouble communicating
with the Ultrasonic board.
Wait a few minutes and see if the condition goes
away. If it continues there may be a problem in the
Ultrasonic, Velocity, or CPU board.
U-Sonic Echo Loss—Flow Meter
Not Receiving a Return Echo
from the Ultrasonic Transducer
Excessive foam on the water surface
cause sound waves to be absorbed
rather than reflected.
Check for excessive foam.
Sensor is knicked or cut or improperly
installed.
Check for knicks, cuts, and the sensor installation.
Sensor must be level for proper return
of signals.
Make sure the ultrasonic transducer is level.
Convection currents are present
which varies the speed of sound.
Try shielding the transducer from convection
currents. Echo loss should not exceed more than
two hours.
Temperature calibration set up
incorrectly. Extreme high or low
temperature indicates a bad
temperature transducer in the
temperature sensor.
Go through the temperature calibration procedure
and determine what temperature the unit is
sensing. Replace transducer if necessary.
U-Sonic Failure—No Signal from
the Ultrasonic Transducer
Transducer is not connected.
Check the ultrasonic sensor connection on the
flow meter.
Cut or broken cable.
Check for any knick or cuts in the cable.
Unusual temperature or inability to
read new calibrated level.
Re-calibrate the unit.
XDucer Ringing—False Return
Echo mask Real Echoes
Liquid is too close to the transducer.
Try moving the transducer farther from the liquid—
more than 15”.
Obstructions under the transducer.
Check for obstructions on the front and sides of
the transducer (see section
Coating on the face of the transducer.
Clean the transducer face. If this is a constant
problem, try coating the face of the transducer with
a very thin film of silicone grease to keep the
debris from collecting.
The transducer resonates against
steel mounting rails.
Use the proper rubber isolation washers.
No Change in Depth Readings
or Inaccurate Depth Readings
—
Check the logged data to see when this started to
occur. Go to the event log to see if anything
happened during the same time.
Calibration
Re-calibrate the unit.
Echo loss or ringing occurs, but not
enough for detection.
Check the trouble areas.
Bad transducer.
Try a different transducer.
Loss of Ultrasonic as Depth
Measuring Device
Blown fuse on CPU board.
Replace fuse. The fuse is located in position F1
under the gray ribbon cable that connects at
position J1. Refer to section .....)
Problem with the ultrasonic board.
Contact factory.
Содержание Sigma 950
Страница 2: ......
Страница 6: ...4...
Страница 20: ...18 Introduction...
Страница 34: ...32 Basic Programming Setup...
Страница 50: ...48 Sensor Installation...
Страница 82: ...80 Maintenance...
Страница 83: ...81 Appendix A Program Flow Charts Figure 22 Overview of Basic Program Menus...
Страница 84: ...82 Program Flow Charts Figure 23 Setup Flow Chart...
Страница 85: ...83 Program Flow Charts Figure 24 Options Flow Chart...
Страница 86: ...84 Program Flow Charts Figure 25 Alarms Menus Flow Chart...
Страница 87: ...85 Program Flow Charts Figure 26 Calibration Menus Flow Chart Page 1...
Страница 88: ...86 Program Flow Charts...
Страница 102: ...100 Programming Features...
Страница 106: ...104 Primary Devices Head Measurement Locations...
Страница 126: ...124 SCADA Modbus System Guidelines...