FEATURES AND BENEFITS
• Low AC voltage on
electrode -
No safety hazard
to personnel
• Field
changeable fail-safe mode -
Operation on low
level or high level application
• Completely
self-contained
Mounts directly
on sensing probe, no additional equipment required
• Wide
adjustment range -
Allows operation
on even partially conductive materials
• Plug-in
Control Relay
Ease of
maintenance.
GENERAL DESCRIPTION
The Model 352 is a conductivity sensing ON-OFF control
unit that is completely self-contained and enclosed in a weathertight and
explosion proof housing. Designed to be mounted directly on the sensing
probe or electrode, it may be used to detect conductive liquid levels or
interface between non-conductive and conductive liquids.
The plug-in chassis assembly within the enclosure is
equipped with a 20 turn potentiometer for threshold resistance adjustment
and provides excellent resolution over a resistance range from 200 ohms to
2 megohms. The output control relay is socket
mounted in DPDT configuration.
The sensing electrode voltage is transformer isolated
from the supply voltage and is stepped down to approximately 10 VAC
assuring personnel safety and freedom from electrode polarization.
Incorporated within the unit are soldered jumper connections that may be
changed in the field to allow low-level or high-level fail safe operation
in the event of supply power failure.
Sensing electrodes, or probes are available in a variety
of lengths and materials to suit the particular application. The sensing
electrode, or probe, must be of the bare, non-insulated style.
