Page 12 Instruction Manual, Alfa Laval Potentiometric Level Transmitter
TE91K021-EN5
6. Setup
6.1 Manuall Teach-In
Make sure that power is on before Teach-In.
The green LED indicates that a supply voltage > 18 V with the correct polarity is present.
The two red LEDs show different flashing rates according to the control of the 4...20 mA output.
The sensor can be installed in the top or the button of the tank.
The sensor is calibrated for installation from the top. Then 4 mA output corresponds to the tip
of the rod, and 20 mA to the thread end.
When installed from the button of the tank an output excessive of 4 mA is obtained.
The sensor can be calibrated by pressing one of the two set point keys for more than 3 seconds.
The relevant LED will show a steady light.
With these two buttons any empty/full level can be configured on the entire length of the rod.
The factory setting will be valid again by pressing both keys for more than 3 seconds.
The “dry” signal level is adjusted together with the low level setting.
The “dry” indication is 2.4 mA output current.
Example:
Caution
If different medias are used the low level adjust-
ment should be made with the media having the
least conductivity.
Caution
The minus pole of the power supply is
connected to the housing via a protective diode.
However, the 4...20 mA output is galvanically
isolated from the power supply.
5
Activ
e
leng
th
Inser
tion
leng
th
—
L
4 mA
20 mA
2,6 mA
20