E+H 651 radar level gauge failure
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The radar level gauge that was just installed is in the correct location; due to the length of the rod, 30 centimeters were cut off. The probe length correction and the manually entered rod length have been applied. After installation and parameter setting, the gauge keeps indicating 66%. Even after suppressing the empty tank, it cannot be reset to zero; an S941 echo loss is indicated, and it is necessary to check the dielectric constant value. After restarting, the gauge returned to zero, but error code 941 still appears. How should I deal with this? Is it necessary to manually enter the dielectric constant? I don’t know this value yet.
Did you check whether the modification was successful after making it manually? If the modification is successful, perform full-range suppression; set the blank value to be slightly shorter than that of the rod.
What is the total length of the cable? What is the height of the tank before cutting and after cutting? Does the tank height also need to be changed? Calculate it yourself – what can be figured out with 66%?
The dielectric constant needs to be set manually; one can check the specifications sheet of the instrument being used in the design. If radar is selected for the design, then this parameter will be available, and an incorrect setting of this parameter indeed has a significant impact on the measurements.
I asked the manufacturer, and they said that there’s no need to set the dielectric constant – it might already be calibrated at the time of ordering. After I restarted the device, it returned to zero, and the echo was lost; the manufacturer said that it would be fine once liquid is introduced
The manual modification was successful, and full-scale suppression was also applied. The manufacturer said it was because of an error code, which caused the system to use its default output. It reset to zero after I restarted the device. That echo is lost; the manufacturer says it will be fine once fluid is introduced
There should be no need to change any parameters; there might just be some interference.
It seems to be the case with empty cans – as long as material is fed in, it’s fine. There might be more interference when the can is empty, preventing the echo from being detected; once material is fed in, the echo is no longer lost.
Yes, that’s why I recommend setting the distance for the empty markers to be a bit longer than that of the rods; this way, even when there are empty cans present, no alarm current will be generated, thereby avoiding the annoyance caused by alarms in some systems.
Yes, so it’s best for the empty marker to be five centimeters shorter than the club.