Flowline AV17 Float-Point - Manual (Page 9)

17 SEPT 08 Switch-Tek Drum Alarms 9 of 10
Rev A MN801853
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 ampmeter 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.