EN
14392029.02 08/2020 EN/DE
Operating instructions magnetostrictive level transmitter, models FLM-xAI, BLM-TAI (Ex)
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3. The level transmitter enters adjustment mode. The current supply of the level transmitter
is 12 mA. Without pressing the button again, the level transmitter remains in adjustment
mode for 20 seconds before it switches back to measuring mode without changing the
adjustment. In adjustment mode, the 4 mA and the 20 mA reference point or both can
now be changed in any order.
4. Define a reference point: Move float to the desired reference point and
■
press the “4 mA” button
briefly (0.1 … 2 seconds), in order to define a current
supply of 4 mA at this position.
■
press the “20 mA” button
briefly (0.1 … 2 seconds), in order to define a current
supply of 20 mA at this position.
After pressing the “4 mA” button, the LED goes out for 5 seconds, after
pressing the “20 mA” button, the LED lights up for 5 seconds continuously.
Subsequently, the sensor remains for a further 15 seconds in adjustment
mode before saving the change and reverting to measuring mode.
The adjustment of the measuring range is only saved when the level
transmitter automatically changes from adjustment mode to measuring mode
and the LED goes out. The adjustment is retained even if the level transmitter
is subsequently disconnected from the power supply.
In order to be able to make the setting “dry” for bypass sensors, the manufacturer of the
bypass requires a magnetic system with spacer. The adjustment can then also be carried
out on the dismounted sensor.
5.3.2 Current supply in error mode
If the level transmitter cannot detect a meaningful float position (i.e. a correct level) due to a
fault, it switches to an error mode after a short time. The signalisation in error mode conforms
to NAMUR NE43 and is factory-set to 21.5 mA - it can, however, be set to 3.6 mA.
To adjust the current supply in the error mode, see figure page 58.
1. Unscrew the probe head cover
using an open-ended spanner.
2. Hold down both the “4 mA” button
and the “20 mA” button
simultaneously for a
period of at least 3 seconds.
The green LED
“Cal/Err” blinks rapidly. The current supply of the level transmitter
is 16 mA. After 5 seconds the LED no longer blinks and displays the set error current
supply for 2.5 seconds. If the LED is permanently lit, I
Error
= 21.5 mA, if the LED goes
out, I
Error
= 3.6 mA. Without pressing the button again, the level transmitter remains in
error mode for another 2.5 seconds before it would switch back to measuring mode
without changing the setting.
5. Commissioning, operation
