KN0004 - Level sensor IFM - Free user manual and instructions

USER MANUAL KN0004 IFM

• Capacitive level switch for monitoring levels of liquids and dry bulk material, preferably plastic granulates.

• Automatic adjustment to the medium to be detected by means of programming pushbutton.

• The sensing face is rated for temperatures up to 110°C and can be mounted in direct contact with the sight glass (without air gap). PAGE 9 programming pushbutton LEDs red, yellow, green sensing face threaded sleeveMounting Mount the level switch as shown: Electrical connection Disconnect the installation from power. Connect the unit (see type label). Operation Adjust the sensor. To do so, press the programming pushbutton with a blunt object. Programming Overview of the modes and their basic functions:

• Operating mode: Normal operating mode. In this mode all normal sensor functions are active.

• Adjustment mode: Setting of the switching threshold by empty and full adjustment.

• Normally closed/normally open mode (NO/NC mode): Change bet- ween normally closed and normally open function. PAGE 10

Not in contact with the medium (only for non-metallic tanks) In contact with the mediumEmpty adjustment The unit must be adjusted after installation in the empty tank (empty adjustment). The tank can be considered to be "empty" when the medium to be detected is min. 20mm away from the active zone. If the sensor detects a medium after adjustment, its switching status chan- ges. Note: The sensor is operational just with empty adjustment. However, it is recommended to carry out a "full adjustment" with the active zone being completely covered after empty adjustment. On the basis of the values for the empty state/full state the internal microprocessor deter- mines the optimum position of the switching thresholds between the two states. Using both adjustment criteria (empty and full adjustment) results in the maximum operational reliability for the application. For empty adjustment the internal microprocessor generates 2 values. The first value corresponds to the sensor signal measured in the empty state. The second value is an assumed measured value for the full state. It is calculated from the just measured empty state and a factory signal preset. For full adjustment this second value is replaced by a real measured value. PAGE 11 Press the programming pushbutton until the green LED flashes (for min.1s and max. 5s; unit is in the adjustment mode). After adjustment - for the output function "nor- mally open" - all LEDs are off. For the output function "normally closed" the yellow LED lights. 1 ... 5sFull adjustment After empty adjustment the full state is to be achieved, if possible, so that the unit switches. The full adjustment can be repeated as often as you like. The stored value for the empty state is not overwritten by the full adjustment. After a new empty adjustment both values are automatically set again, the values last defined are overwritten. Therefore always carry out the empty adjustment first, then, if necessary, the full adjustment! NO/NC mode: The switching output of the unit can be operated as normally closed or normally open contact. To do so the unit must first be put in the NO/NC mode. Activating the NO/NC mode: Press the programming pushbut- ton for min. 10s. The green LED first flashes slowly (about 1Hz), after 5s more quickly (about 2Hz), after 10s slowly again (about 1 Hz). PAGE 12 Press the programming pushbutton until the green LED flashes quickly (= unit is in the adjustment mode). The LED first flashes slowly (about 1 Hz), after 5s it flashes double as quickly (about 2 Hz). After adjustment - for the output function " nor- mally open" - only the yellow LED lights. For the output function "normally closed" all LEDs are off. 5 ... 10s min. 10sThe unit now displays the current output function (normally closed or normally open):

• Normally open: green LED flashes slowly (about 1Hz)

• Normally closed: green and yellow LEDs flash alternately (about 1Hz) Changing the output function: Press the programming pushbut- ton for min. 1s but not longer than 5s. The change is immediately display- ed by the LEDs after the program- ming pushbutton is released. Deactivating the NO/NC mode: Press the programming pushbut- ton in the NO/NC mode until the LEDs go out (min. 5s). The unit is in the operating mode again. All normal sensor functions are active again. After each programming operation the NO/NC mode must be deactivated. If after the change into the NO/NC mode no operation is carried out for 30s the unit automatically changes back to the operating mode. The output function is not defined. Repeat the pro- gramming operation and then deactivate the NO/NC mode. Note: The switching function of the sensor is not active in the NO/NC mode. The output maintains the switching state which it had before swit- ching on the NO/NC mode. The output stays virtually "frozen" until the NO/NC mode is deactivated again. PAGE 13 1 ... 5s min. 5sError messages If empty or full adjustment cannot be made, the red LED flashes quick- ly at about 8Hz after the adjustment attempt (adjustment error). To delete this error message press the programming pushbutton once or power off and then power on again. The measured values succes- sfully read so far remain unchanged. Possible reasons for an error message:

• The signal difference between the empty and full state is too small (e.g. empty and full adjustment without sufficient change of the level).

• The signal change between the empty and full state is in the wrong order (e.g. empty adjustment in the full state and then full adjust- ment in the empty state).

• Empty adjustment outside the operating range (e.g. empty adjust- ment in case of direct contact with an electrically grounded medi- um, e.g. if the active zone is immersed in water). Help: Avoid the above-mentioned errors and repeat the adjustment for error correction. Further faults:

• Electronic fault or sensing zone of the unit damaged.

• Internal fault (can only be deleted by power off and then power on again, hardware reset). PAGE 14Set-up/Operation Check the safe functioning of the unit. To do so, bring about a sensor response by taking suitable measures. Display by LEDs: The red LED becomes active for a short time during the change bet- ween "medium not present" and "medium present" (flashes at 1Hz) if the medium is close to reaching the switching threshold. This can occur in particular if the level changes very slowly and is no error mes- sage meaning a fault in the unit. The operation of the level switch is maintenance-free. For a correct function ensure:

• The sensing face and the open space should be kept free of depo- sits and foreign bodies, particularly for mounting with the sensing face showing upwards. PAGE 15 LED green

• Flashes slowly (1Hz): adjustment mode empty state or NO/NC mode (output configured as normally open)

• Flashes quickly (2Hz): adjustment mode full state

• OFF: unit in the operating mode LEDs green + yellow

• flash alternately (1Hz): NO/NC mode (output configured as normally closed) LED yellow

• flashes quickly (8Hz): adjustment error, internal fault