Siemens HydroRanger 200 HMI Operating Instructions Manual page 286

Diagnosing and troubleshooting
10.3 Common problems chart
Symptom
Accuracy Varies
Reading erratic
Incorrect reading
(mA output and/or
displayed value)
284
Possible cause
Incorrect Algorithm used
Transducer mounting:
wrong location or incor-
rectly mounted
Incorrect transducer
used for the application
Unavoidable false ech-
oes from obstructions
Faulty temperature sen-
sor
Vapours present in vary-
ing concentrations
Thermal gradients
Calibration required
Transducer mounting:
wrong location or incor-
rectly mounted
Unavoidable false ech-
oes from obstructions
Confidence too low
Multiple echoes
Noise in the application
mA function not as-
signed to correct meas-
urement
When device configured
for flow: exponent or
breakpoint not correctly
selected
Action
Set algorithm to default. If no improvement, try a
different algorithm. See Algorithm (2.11.2.2.)
(Page 222).
Ensure beam has a clear path to material surface;
Verify transducer is not too tight; Use an isolation
coupling.
Use correct transducer. Contact your Siemens
representative.
Relocate transducer to ensure beam has a clear
path to material surface; Use manual TVT shaping
or Auto False Echo Suppression. See TVT Shaper
(2.11.4.) (Page 231) or Auto false echo suppres-
sion (2.11.3.2.) (Page 227).
Verify operation; Replace if required, or use fixed
temperature. See Temperature source (2.11.1.4.)
(Page 219).
Eliminate vapours or consider a different technolo-
gy. Contact your Siemens representative.
Insulate vessel; Consider external temperature
sensor.
If accuracy is better when level is close to trans-
ducer, and worse when level is far from transducer,
perform calibration [see Auto sound velocity
(2.11.1.8.) (Page 221)].
If accuracy is consistently incorrect, use Sensor
offset (2.2.5.) (Page 171) or perform calibration.
Ensure beam has a clear path to material surface;
Verify transducer is not too tight; Use an isolation
coupling.
Use Auto False Echo Suppression. See Auto false
echo suppression (2.11.3.2.) (Page 227).
Check Noise, Echo Strength, Confidence. See
Echo quality (3.2.11.) (Page 262).
Check LOE Timer is not set too short. See LOE
timer (2.4.2.) (Page 177).
Check mounting location; Verify material is not
entering near range or blanking zone. See Blank-
ing (2.2.6.) (Page 171).
Verify source and minimize. See Noise problems
(Page 286).
Check mA assignment. See Current output func-
tion (2.5.3.) (Page 181).
Check configuration: if Sensor mode (2.1.3.)
(Page 163) is set to FLOW, verify correct exponent
[Flow exponent (2.13.4.1) (Page 241)] and break-
points [Universal head vs flow (2.13.6.)
(Page 247)].
Operating Instructions, 06/2018, A5E36281317-AC
HydroRanger 200 HMI