Calibration - Emerson Fisher FIELDVUE L2t Instruction Manual

L2t Liquid Level Controller
October 2023

Calibration

The L2t is is pre-calibrated when ordered from the factory; recalibration is generally unnecessary. However, if
calibration is required for any reason, refer to the following calibration procedure.
NOTICE
When accessing the pushbuttons or terminals, proper means of electrostatic discharge protection is required. Failure to
provide appropriate protection can cause the device to malfunction.
The primary function of the local user interface is for calibration. However, the LED on the local user interface can
provide information for checking the status of the device, as well as connected equipment or valve, as follows:
Green Normal, no issues
Green blink Indicates an alert is active
Red solid Failure - replace device, solid red during calibration for 2 seconds only
Red blink Function Check, calibration error, Calibration in Progress, and/or Out of Service.
Note
The cover must be removed for the LED on the local user interface to be visible, as well as to access the zero and span buttons.
Ensure the LED is solid green prior to calibrating the instrument. If the LED is is not solid green, check the magnet assembly
position and adjust as needed to change to solid green. If performing the calibration procedure after a failed calibration the LED
will be blinking red. Cycle instrument power before attempting another calibration.
Note
The level must move from empty to full (or 100), or vice versa, in order for the level transmitter to be calibrated. The Zero and
Span buttons and LED (shown in figure 3) are used during calibration. Press both for 3 - 8 seconds until the LED flashes red, see
Calibration section below. Attempting to calibrate the device without moving the process will result in the action being discarded;
the operation of the device will be unchanged. The calibration function of the local user interface can be locked out from the HART
master for security purposes.
Note
In order to perform calibration and/or configuration procedures, the configuration lock switch (shown in figure 3) must be in the
unprotected position ( ) and the instrument must be In Service.
Once calibration and configuration is complete, set the configuration lock switch to the protected position ( ) to prevent
configuration and calibration changes to the instrument.
Calibration using the LUI
1. Verify the level is at the point you want the dump valve to be fully closed.
12
Instruction Manual
D104782X012