Flowline AV17 Float-Point - Manual (Page 5)

17 SEPT 08 Switch-Tek Drum Alarms 5 of 10
Rev A MN801853
Introduction
Flowline offers several level indication products designed specifically for standard 20-, 30- and 55-
gallon drums. These level indicators will fit-up directly with standard 3/4” NPT bungs. This family of
standard level switch (es) comes in low-level, high-level and multi-level designs, for both low-and high-
level indication. The basic level switch uses an on-board battery supply as a power source. Alarms are
available in either a fixed-mount (to the level switch) or a remote-mount design. This package provides
both the level switch and the alarm with battery power for ease of use in remote sites where a power
source is not readily available.
1. Switches should be installed rigidly so the float or floats are free to move as the liquid level
changes.
2. Switches should be mounted in a tank area free of severe turbulence or protected from such
turbulence by appropriate and adequate slosh shields.
3. Vertical switch stems should be vertical for best results, but satisfactory operation is possible in
most liquids with the stem at up to a 30° angle from vertical.
4. Care should be taken that switches are always operated within electrical ratings.
General Information:
o Available for high-level signal, low-level signal, or high and low level signals.
o Designed with liquid tight fittings, allowing for usage both indoors and outdoors.
o Optional alarm enclosures are available, see part number chart below.
Technology
Float switches consist of a float, magnet, reed switch and body/stem with mounting threads. When the
probe is dry, the float rests on the bottom of the stem such that the magnet does not influence the reed
switch. As the probe becomes immersed in liquid, the float becomes buoyant and the magnet elevates
causing the reed switch to change state.
Installation
o Apply a suitable thread sealant to the threads.
o Tighten into 3/4" bung of drum, ½ turn beyond hand tight.
Alarm Enclosures:
o AV17-S101, AV17-S201 and AV17-S301
o Fixed mount design. Will be threaded onto the stem assembly during assembly.
o Available in a High-Level, Low-Level or High and Low-Level, see part number chart below.
o
Standard design with LED’s for alarm.
o Top-level part, AV17-S101, AV17-S201 and AV17-S301, must be ordered with the alarm.
The end user cannot install the Alarm.
o AV17-S401, AV17-S501 and AV17-S601
o Remote mount design. Uses liquid tight fitting to secure cable to enclosure.
o Available in a High-Level, Low-Level or High and Low-Level, see part number chart below.
o
Standard design with LED’s for alarm.
o Top-level part, AV17-S401, AV17-S501 and AV17-S601, must be ordered with the alarm.
The end user can remove the alarm enclosure.