Diagnostics and troubleshooting
Teqwave H
72
Hauser
LED
Signal
Meaning
Flashes
The measurement is not stable and/or at least one of the measured variables is outside the valid range. This can be caused
by the following system conditions:
•
Measuring range limits exceeded/undershot:
At least one of the measured variables has breached its configured
permitted range.
•
Calibration range limits exceeded/undershot:
At least one of the measured variables (temperature or concentration)
has breached its permitted calibration range.
•
Change in temperature too high:
The change in the temperature of the liquid has exceeded the limit value saved in the
transmitter. Wait until the liquid is stable again.
•
Change in concentration too high:
The change in the concentration of the liquid has exceeded the limit value saved in
the transmitter. Wait until the liquid is stable again.
Sensor error
Lit red
Sensor error. Read exact error code with the Viewer. The following errors are possible:
•
No liquid present:
Ensure that there is sufficient bubble-free liquid in the sensor.
•
No sensor connected:
Ensure that the sensor is connected to the transmitter via the connecting cable.
12.5 Diagnostic information via dispersion indicator
The dispersion indicates a disturbance in the liquid caused by the dispersion of gas bubbles
or particles. This causes a widening in the group and phase speed of sound.
The measuring device displays a standardized factor. If this value is less than 1, this
indicates that the speed of sound determined for the undisturbed fluid can still be
determined with the specified measured error. On the other hand, the density measured
error can already be greater than the measured error specified under reference conditions
at values over 0.25.
Therefore, if the speed of sound and temperature are used for concentration
measurement, the value of 1 should not be exceeded. If the density is used, the value of
0.25 should not be exceeded.
If the measured dispersion is greater than the configured switch point, the measuring
device no longer displays the concentration or analysis parameter. The configured switch
point can be viewed as follows:
Navigation using transmitter with touch screen: "Settings" → "Application parameters" →
"Diagnosis" → "Process disturbance" → "Switch point"
Navigation using the Viewer: menu "Teqwave Transmitter" → "View filter" → "Process
disturbance" → "Switch point"
12.6 Testing the sensor
The
Sensor testing
function in the Viewer allows users to test the accuracy of the sensor.
A test report is created for documentation purposes.
Navigation using the Viewer
Menu "Teqwave Transmitter" → "Sensor testing"
NOTICE
Incorrect test result
The use of tap water and the presence of air bubbles or variable environmental conditions
(e.g. variations in temperature or flow) can corrupt the test result.
‣
Clean the sensor before performing the test.
‣
Only use distilled or fully deionized water (conductivity < 20 µS/cm) to test the sensor.
‣
Boil the liquid for several minutes to prevent air bubbles occurring.
‣
Ensure constant environmental conditions.
1. Open the menu "Teqwave Transmitter" → "Sensor testing".
A message appears with information on the preparatory steps.
2. Fill the sensor completely with distilled or completely deionized water.