Flowline AVX6 Float-Point - Manual (Page 13)

22 AUG 08 Switch-Tek Float Series 13 of 14
Rev A MN801839
Maintenance
Maintenance should consist of inspection to see that the float is free to move and not coated with
any substance, which would change its weight or volume significantly. If this occurs, the float
should be cleaned. This is easily accomplished without disturbing the installation. In addition,
the stem may be wiped down to remove any build-up. The only repair possible in the field is
replacement of either the float or stem. Dents or nicks on the float are usually of no consequence
to operation.
Cautions
FLOWLINE manufactures a wide range of liquid level switches and technologies. While each
of these switches are designed to operate in a wide variety of applications, it is the user's
responsibility to select a switch model that is appropriate for the application, install it properly,
perform tests of the installed system, and maintain all components. The failure to do so could
result in property damage or serious injury.
1. The pressure, temperature and electrical limitations shown for the specified level
switches must not be exceeded.
2. The pressures and temperatures must take into consideration possible surges in the
temperature and pressure of the system.
3. The liquids used must be compatible with the materials of construction. Specifications of
materials will be given upon request.
4. Life expectancy of the switch varies with applications. Contact the factory if life cycle
testing is required.
5. Ambient temperature changes can affect switch set points, since specific gravities of
liquids vary with temperature. Consult factory for assistance.
6. Level switches have been designed to be shock and vibration resistant. For maximum
life, both shock and vibration should be minimized. Consult factory for assistance.
7. Excessive contaminants in fluid may inhibit float operation, and occasional wipe down
may be necessary.
8. Level switches must not be field repaired
9. Physical damage to product may render product unserviceable.
10. Installation in a vessel made from magnetic materials may affect operation.
Testing the installation:
1. Power: Turn on power to the controller and/or power supply.
2. Immersing the switch: Immerse the sensing tip in its application liquid, by filling the
tank up to the switches point of actuation. An alternate method of immersing the switch
during preliminary testing is to hold a cup filled with application liquid up to the switch's
tip.
3. Test: With the switch being fluctuated between wet and dry states, the switch indicator
light in the controller should turn on and off. If the controller doesn't have an input
indicator, use a voltmeter or ammeter to ensure that the switch produces the correct
signal.
4. Point of actuation: Observe the point at which the rising or falling fluid level causes the
switch to change state, and adjust the installation of the switch if necessary.