ABB LevelMaster 7100, Руководство пользователя, Страница: 87 / 100

LevelMaster 7100 User manual 2105835 Rev AA | 77
Replace floats
The following procedures describe how to replace floats with the same or different type of float. Float types include: passive,
active and batteryless. Units with one float will usually have a passive float, whereas units with two floats must have active or
batteryless floats. Active and batteryless floats can also be different from each other when considering the density of the
measured medium, such as floats used for oil versus water.
IMPORTANT NOTE: Float replacement requires removing field wiring and taking the unit out of the tank.
Changing floats generally requires test programs to be run on the LevelMaster and certain setup data to be modified to support
the new float. When replacing active float(s) with a passive float, two test programs must be run. This is all done by the
MasterLink software program by selecting the correct float configuration from a list of options.
DANGER - Serious damage to health/risk to life. When performing service, or using a laptop in a classified area,
ensure that explosive gasses are not present.
Tools required:
Small slotted screwdriver
Phillips screwdriver
Replace existing floats
To replace one or more floats:
1. Remove the power and cover as described in section 8.1, Remove the enclosure cover .
2. Remove field wiring as described in section 8.2, Remove field wiring.
3. Remove the unit from the tank as described in section 8.4, Remove the unit from the tank .
4. Remove the float clamp from the bottom of the casing.
5. Slide the exsiting float ( s ) off the bottom of the casing.
6. Slide the new float(s) onto the bottom of the casing. If using two floats, install in the correct order (Figure 65).
IMPORTANT NOTE: If the float labels do not have arrows indicating the direction for insertion, position the float(s)
correctly so that the text on the float label will be in the upright position when the LevelMaster is inserted back into
the tank.
a. Install the oil level float first.
b. Install the water level float second.
Figure 65: Inserting new floats
7. Slide the float clamp back onto the bottom of the casing.
8. Use a Phillips screwdriver to tighten the clamp 1 inch above the bottom of the casing. Considerable force may be required
to lock the clamp on tight.