Robershaw Capacitance Level products
Model 314B, dual point capacitance level switch
The can be used to measure the level of liquids and solids in a variety of tanks, bins, totes etc. These products are based on measuring the capacitance between a probe and the wall of the vessel. These are also classed as RF ( Radio Frequency) Admittance, RF Impedance level measuring devices. Robertshaw provide Control Units and Probes for Single Point, Multipoint ( two points on a single probe ) and Continuous ( 4-20ma current output). The continuous level measurement can be used with 4-20ma alarms to generate multiple alarms from a single probe. Units are avalable with general purpose enclosures and explosion proof enclosures for hazardous areas.
These units all require a capacitance probe to operate. See Probes
Duplex Level-Tek Model 314B
The Robertshaw Model 314B Level-Tek is an all solid
state RF control instrument providing ON/OFF control with two
independently adjustable setpoints each with its own output control relay.
For use with a vertically mounted probe assembly, the independent and
non-interacting control points may be adjusted throughout the length of
the probe up to the limits of the capacitance range.
This true "duplex" or dual Level-Tek provides application versatility with cost and space savings not previously obtainable. Available by order in fail-safe control modes for "High" and "Low", "High" and "High-High", or "Low" and "Low-Low". The operational mode may be changed in the field by soldered jumper connections on the chassis assembly.
The Model 314B has two independent set-points, each with adjustable differential. The Set-point and Differential adjustments are by means of nominal 20 turn sealed potentiometers with light-emitting diodes on the chassis assembly to indicate relay operation as an aid in calibration.
The aluminum die-cast enclosure for the Model 314B is suitable for use in hazardous areas classified Class I Division 1, Groups C & D as well as NEMA 4 watertight.
FEATURES AND BENEFITS
- Patented Anti-Coating Principle
- Minimizes error due to material build-up on probe.
- Two independent set-points and control relays
- Space and cost savings.
- Wide Range Adjustability
- Operates over larger level spans.
- Adjustable Differential on each set-point
- Greater versatility of applications.
- Single unit system mounts directly on the probe
- Lower purchasing and installation costs.
- Field selectable fail-safe modes of operation
- Simple soldered jumper links.