ABB LevelMaster 7100, Руководство пользователя, Страница: 56 / 100

LevelMaster 7100 User manual 2105835 Rev AA | 46
Figure 44: Configure the LevelMaster to terminate the RS-485 bus
7. Click Send New Value .
8. Verify that the RS-485 termination address is now set to 1 (Figure 45).
Figure 45: RS-485 termination configuration for only or last LevelMaster
IMPORTANT NOTE: The RS-485 bus termination value for intermediate LevelMasters on the RS-485 bus should
be 0. Units are configured as intermediate sensors by default.
9. If connecting to an ABB Totalflow host controller directly or through the RS-485 bus, proceed to section 6, Configuring the
host controller .
10. If the unit is not connected to an ABB Totalflow host controller, proceed to calibrate the unit or add level bias in section
5.3.3, Calibration (standalone installations only) , next.
Calibration (standalone installations only)
Although the LevelMaster is a highly accurate factory-calibrated device, there can be subtle discrepancies that may require the
floats to be calibrated in the field. For example, discrepancies such as the specific gravity of the fluid being slightly different than
what the float was calibrated for, may cause the float to sit slightly higher or lower in the fluid, resulting in less precision in the
measurement reading.
Calibrating the float in the field in this case is done by determining a new level factor and making a positive or negative
adjustment to the level. This is called a bias.