Remote Correction of the Full/Empty Calibration
The Full/Empty recalibration of the Omnicomm LLS 4 fuel level sensor is required when the sensor calibration changes. It manifests as a discrepancy of readings from the sensor when the tank is empty or full (e.g., when fuel characteristics change, dirt accumulates on the measuring part during long operation, or the sensor is installed incorrectly). Recalibration is required when a horizontal section appears in the Fuel Volume report in Omnicomm Online when the tank is full and the vehicle is moving, as shown below:
If recalibration is required, it is recommended to carry out service maintenance of the Omnicomm LLS 4 fuel level sensor. As a temporary measure, before the maintenance can be carried out and if the fuel level sensors are connected to Omnicomm terminals with firmware version FW309 and above, perform recalibration using SMS commands:
| Command | Designation | ||
|---|---|---|---|
| Command text in SMS | Reply to a command in SMS | Example of command / reply | |
| *GETCNTINFO# | GETCNTINFO LLS1: CNTmin1, CNTmax1, CNT_T LLS2: ….VID = 336xxxxxxx, where CNTmin1 , CNTmax1, CNT_current1 – “empty”, “full”, current values VID – terminal ID | LLS1: 90000, 172202, 129893 LLS2: 50000, 350000, 132485 VID=326001571 | Request current CNT readings (“empty”, “full”) |
| *SETCNT pwd numlls CNTmin2 СNTmax2# where pwd – password to change terminal settings numlls – sensor network address CNTmin2 СNTmax2 – “empty” and “full” new values | SETCNT OK – SMS worked correctly SETCNT PWD ERR – wrong or no password entered SETCNT ERRVALUE – incorrect CNT values entered SETCNT ERRPARAM – incorrect SMS format | *SETCNT pass 1 42000 300000# | Set new СNT_empty/full values (CNTmin2 and СNTmax2) |
| *SETCNTFULL pwd numlls koef_empty# where pwd – password to change terminal settings numlls – sensor network address koef_empty – “empty” value change flag koef_empty = 0, then CNT_empty does not change koef_empty = 1, then СNT_empty increases by the same amount as CNT_full | SETCNTFULL OK – SMS worked correctly SETCNT PWD ERR – wrong or no password entered SETCNTFULL ERRVALUE – Conditions outlined in the Limitations were not met SETCNT ERRPARAM – wrong SMS format | *setcntfull pass 1 0# | Automatic correction of the CNT_empty/full values |
Perform automatic correction of values on one sensor and only on a full tank. Fill a full tank and send the SMS command to the terminal. Corrected values must not differ from the set ones by more than 15%.
