© IS Technologies Co., Ltd. PAGE 39 / 41
VIII. Trouble shooting
When some problem is occurred in ULM-1000C, the error code displays on the
screen, it ows what the problem is. The error code information can be
founded in this manual.
1. The level changes heavily periodically
Cause: Motor or alternator is installed.
1) Set the velocity lower than current setting value or
2) The level ould be moved to another position where is not eected from
the machinery.
2. The level changes irregularly
Cause: Barrier within the ultrasonic range.
1) Set the velocity lower than current setting value or
2) Set the Detection Threold Voltage lower than current voltage or
3) Check the sensor bottom surface if there is any foreign debris or pollution.
3. The level shows only within blanking distance
Cause: Error by the protrusions in the nozzle of reservoir.
1) Check the nozzle inside surface or
2) Check the nozzle diameter which is recommended in the manual or
3) Increase the blanking distance not over the highest level point.
4. The level is incorrect in the sealed space.
Cause: The pressure is increased by gas generation.
1. set the sound velocity according to the medium or
2. Install ventilation.
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