These heavy duty top-mounted liquid level controls operate in
pressurized or non-pressurized tanks and sumps with pressures to 600 psi
and temperatures to 500°F. They can be ordered to operate at depths to
12 feet with a 12 foot guide rod. Adjustable in single stage and two
stage operation to provide action such as operating a pump; pump and
high alarm or shutdown; pump and low alarm, or high and low alarm; or
high, high alarm; or low, low alarm. Alarm functions can also be used as
shutdowns. Series 401 is available in mercury or snap action contact
switches. Specific gravity applications from 0.5 to 1.0.
The reliable 301 Series has proven to be a rugged economical choice for
top mounting on tanks where side mounting is not practical, or for use
in sumps. These units feature a fixed deadband for high or low alarm or
shutdown. This control can be mounted on top of any closed or open tank
or sump by use of the 3/4" NPT connection. Flanges are also available in
various sizes, pressure rating and material to meet any installation.
Several size floats are available to accommodate liquids to a specific
gravity of 0.5 and depths to 12 feet.Electrical switch actions, SPST (SPDT) (DPDT) or (DPST), can be ordered
to satisfy most applications. Two-stage operation
available, consult factory. Hermetically sealed snap action or mercury
contacts provide for high or low current or voltage requirements.
Enclosures include general purpose NEMA 1, weatherproof NEMA 4,
explosion-proof NEMA 7, 9. The explosion-proof, vapor proof version
combines weatherproof, vapor proof, and explosion-proof NEMA 4, 7, 9
construction in one enclosure. The 301 Series can be used on