K-TEK Level Transmitter

It's broken. Get it fixed, or replace it.

Is the level transmitter based on magnetostrictive principle? Is there aeration of the liquid? Can you post a sketch & type no of the K-TEK LEVEL TRANSITTER?

It is in dyhydrtion tank oil and water only

This is the model No of Float: EC/CST/4/FOFOW2/WR21/1219mm

Serial No; 10909 0023 01

This is the model No of Transmitter: AT100/S6/LW/A/R1/H1/M4A/X/CEX/(WP)CST-R41/FXX/1534MM

Serial No; 09-T4619

Without product manufacturer's name/web address it is impossible to gather info on the products. Normally, aeration/bubbles in the path of level transmitter signal will give rise to wrong reading.

Please reads Nola's comments at this link:

http://www.plctalk.net/qanda/archive/index.php/t-41264.html

http://www.ktekcorp.com/dnn20/Default.aspx?tabid=54&productTypeID=2

These may help.

There's a jumper that defines whether the output goes to 21.0mA (upscale) or 3.6mA (downscale) during 'failsafe' conditions:

3.4 Jumper Settings

The jumpers located on the face of the electronics module (top left hand side) can be setup as follows, as described in the manual section (page 6) below:

See Section 6.11

ALARM (Fail Safe): (left jumper)

-The Alarm jumper will determine the output of the transmitter in the event that there is a failure in detecting the return signal from the sensor tube. This jumper should be set in the location which will send the control structure into a safe state.

-Placing the jumper to the lower position causes the output to go to 20.99 mA when there is a loss of signal or transmitter malfunction.

-Placing the jumper to the upper position causes the output to go to 3.61 mA when there is a loss of signal or transmitter malfunction.

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You might be seeing momentary, intermittent failsafe conditions, which return to normal due to process conditions.

The release of a large bubble of air somewhere below the transmitter might do that, though the original posting makes no reference to the vessel in which the equipment is located, its size, the piping arrangements, the flowrates, the temperatures and pressures, etc., etc.